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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_MM_H |
3 | #define _LINUX_MM_H | |
4 | ||
1da177e4 LT |
5 | #include <linux/errno.h> |
6 | ||
7 | #ifdef __KERNEL__ | |
8 | ||
309381fe | 9 | #include <linux/mmdebug.h> |
1da177e4 | 10 | #include <linux/gfp.h> |
187f1882 | 11 | #include <linux/bug.h> |
1da177e4 LT |
12 | #include <linux/list.h> |
13 | #include <linux/mmzone.h> | |
14 | #include <linux/rbtree.h> | |
83aeeada | 15 | #include <linux/atomic.h> |
9a11b49a | 16 | #include <linux/debug_locks.h> |
5b99cd0e | 17 | #include <linux/mm_types.h> |
08677214 | 18 | #include <linux/range.h> |
c6f6b596 | 19 | #include <linux/pfn.h> |
3565fce3 | 20 | #include <linux/percpu-refcount.h> |
e9da73d6 | 21 | #include <linux/bit_spinlock.h> |
b0d40c92 | 22 | #include <linux/shrinker.h> |
9c599024 | 23 | #include <linux/resource.h> |
e30825f1 | 24 | #include <linux/page_ext.h> |
8025e5dd | 25 | #include <linux/err.h> |
fe896d18 | 26 | #include <linux/page_ref.h> |
7b2d55d2 | 27 | #include <linux/memremap.h> |
1da177e4 LT |
28 | |
29 | struct mempolicy; | |
30 | struct anon_vma; | |
bf181b9f | 31 | struct anon_vma_chain; |
4e950f6f | 32 | struct file_ra_state; |
e8edc6e0 | 33 | struct user_struct; |
4e950f6f | 34 | struct writeback_control; |
682aa8e1 | 35 | struct bdi_writeback; |
1da177e4 | 36 | |
597b7305 MH |
37 | void init_mm_internals(void); |
38 | ||
fccc9987 | 39 | #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */ |
1da177e4 | 40 | extern unsigned long max_mapnr; |
fccc9987 JL |
41 | |
42 | static inline void set_max_mapnr(unsigned long limit) | |
43 | { | |
44 | max_mapnr = limit; | |
45 | } | |
46 | #else | |
47 | static inline void set_max_mapnr(unsigned long limit) { } | |
1da177e4 LT |
48 | #endif |
49 | ||
4481374c | 50 | extern unsigned long totalram_pages; |
1da177e4 | 51 | extern void * high_memory; |
1da177e4 LT |
52 | extern int page_cluster; |
53 | ||
54 | #ifdef CONFIG_SYSCTL | |
55 | extern int sysctl_legacy_va_layout; | |
56 | #else | |
57 | #define sysctl_legacy_va_layout 0 | |
58 | #endif | |
59 | ||
d07e2259 DC |
60 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS |
61 | extern const int mmap_rnd_bits_min; | |
62 | extern const int mmap_rnd_bits_max; | |
63 | extern int mmap_rnd_bits __read_mostly; | |
64 | #endif | |
65 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS | |
66 | extern const int mmap_rnd_compat_bits_min; | |
67 | extern const int mmap_rnd_compat_bits_max; | |
68 | extern int mmap_rnd_compat_bits __read_mostly; | |
69 | #endif | |
70 | ||
1da177e4 LT |
71 | #include <asm/page.h> |
72 | #include <asm/pgtable.h> | |
73 | #include <asm/processor.h> | |
1da177e4 | 74 | |
79442ed1 TC |
75 | #ifndef __pa_symbol |
76 | #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) | |
77 | #endif | |
78 | ||
1dff8083 AB |
79 | #ifndef page_to_virt |
80 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x))) | |
81 | #endif | |
82 | ||
568c5fe5 LA |
83 | #ifndef lm_alias |
84 | #define lm_alias(x) __va(__pa_symbol(x)) | |
85 | #endif | |
86 | ||
593befa6 DD |
87 | /* |
88 | * To prevent common memory management code establishing | |
89 | * a zero page mapping on a read fault. | |
90 | * This macro should be defined within <asm/pgtable.h>. | |
91 | * s390 does this to prevent multiplexing of hardware bits | |
92 | * related to the physical page in case of virtualization. | |
93 | */ | |
94 | #ifndef mm_forbids_zeropage | |
95 | #define mm_forbids_zeropage(X) (0) | |
96 | #endif | |
97 | ||
a4a3ede2 PT |
98 | /* |
99 | * On some architectures it is expensive to call memset() for small sizes. | |
100 | * Those architectures should provide their own implementation of "struct page" | |
101 | * zeroing by defining this macro in <asm/pgtable.h>. | |
102 | */ | |
103 | #ifndef mm_zero_struct_page | |
104 | #define mm_zero_struct_page(pp) ((void)memset((pp), 0, sizeof(struct page))) | |
105 | #endif | |
106 | ||
ea606cf5 AR |
107 | /* |
108 | * Default maximum number of active map areas, this limits the number of vmas | |
109 | * per mm struct. Users can overwrite this number by sysctl but there is a | |
110 | * problem. | |
111 | * | |
112 | * When a program's coredump is generated as ELF format, a section is created | |
113 | * per a vma. In ELF, the number of sections is represented in unsigned short. | |
114 | * This means the number of sections should be smaller than 65535 at coredump. | |
115 | * Because the kernel adds some informative sections to a image of program at | |
116 | * generating coredump, we need some margin. The number of extra sections is | |
117 | * 1-3 now and depends on arch. We use "5" as safe margin, here. | |
118 | * | |
119 | * ELF extended numbering allows more than 65535 sections, so 16-bit bound is | |
120 | * not a hard limit any more. Although some userspace tools can be surprised by | |
121 | * that. | |
122 | */ | |
123 | #define MAPCOUNT_ELF_CORE_MARGIN (5) | |
124 | #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) | |
125 | ||
126 | extern int sysctl_max_map_count; | |
127 | ||
c9b1d098 | 128 | extern unsigned long sysctl_user_reserve_kbytes; |
4eeab4f5 | 129 | extern unsigned long sysctl_admin_reserve_kbytes; |
c9b1d098 | 130 | |
49f0ce5f JM |
131 | extern int sysctl_overcommit_memory; |
132 | extern int sysctl_overcommit_ratio; | |
133 | extern unsigned long sysctl_overcommit_kbytes; | |
134 | ||
135 | extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *, | |
136 | size_t *, loff_t *); | |
137 | extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *, | |
138 | size_t *, loff_t *); | |
139 | ||
1da177e4 LT |
140 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
141 | ||
27ac792c AR |
142 | /* to align the pointer to the (next) page boundary */ |
143 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) | |
144 | ||
0fa73b86 | 145 | /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */ |
1061b0d2 | 146 | #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)(addr), PAGE_SIZE) |
0fa73b86 | 147 | |
1da177e4 LT |
148 | /* |
149 | * Linux kernel virtual memory manager primitives. | |
150 | * The idea being to have a "virtual" mm in the same way | |
151 | * we have a virtual fs - giving a cleaner interface to the | |
152 | * mm details, and allowing different kinds of memory mappings | |
153 | * (from shared memory to executable loading to arbitrary | |
154 | * mmap() functions). | |
155 | */ | |
156 | ||
0d2c7e02 | 157 | struct vm_area_struct *vm_area_alloc(struct mm_struct *); |
e88c5cf9 LT |
158 | struct vm_area_struct *vm_area_dup(struct vm_area_struct *); |
159 | void vm_area_free(struct vm_area_struct *); | |
c43692e8 | 160 | |
1da177e4 | 161 | #ifndef CONFIG_MMU |
8feae131 DH |
162 | extern struct rb_root nommu_region_tree; |
163 | extern struct rw_semaphore nommu_region_sem; | |
1da177e4 LT |
164 | |
165 | extern unsigned int kobjsize(const void *objp); | |
166 | #endif | |
167 | ||
168 | /* | |
605d9288 | 169 | * vm_flags in vm_area_struct, see mm_types.h. |
bcf66917 | 170 | * When changing, update also include/trace/events/mmflags.h |
1da177e4 | 171 | */ |
cc2383ec KK |
172 | #define VM_NONE 0x00000000 |
173 | ||
1da177e4 LT |
174 | #define VM_READ 0x00000001 /* currently active flags */ |
175 | #define VM_WRITE 0x00000002 | |
176 | #define VM_EXEC 0x00000004 | |
177 | #define VM_SHARED 0x00000008 | |
178 | ||
7e2cff42 | 179 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
1da177e4 LT |
180 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
181 | #define VM_MAYWRITE 0x00000020 | |
182 | #define VM_MAYEXEC 0x00000040 | |
183 | #define VM_MAYSHARE 0x00000080 | |
184 | ||
185 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ | |
16ba6f81 | 186 | #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */ |
6aab341e | 187 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
1da177e4 | 188 | #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ |
16ba6f81 | 189 | #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */ |
1da177e4 | 190 | |
1da177e4 LT |
191 | #define VM_LOCKED 0x00002000 |
192 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ | |
193 | ||
194 | /* Used by sys_madvise() */ | |
195 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ | |
196 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ | |
197 | ||
198 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ | |
199 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ | |
de60f5f1 | 200 | #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */ |
1da177e4 | 201 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
cdfd4325 | 202 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
1da177e4 | 203 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
b6fb293f | 204 | #define VM_SYNC 0x00800000 /* Synchronous page faults */ |
cc2383ec | 205 | #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ |
d2cd9ede | 206 | #define VM_WIPEONFORK 0x02000000 /* Wipe VMA contents in child. */ |
0103bd16 | 207 | #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */ |
d00806b1 | 208 | |
d9104d1c CG |
209 | #ifdef CONFIG_MEM_SOFT_DIRTY |
210 | # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */ | |
211 | #else | |
212 | # define VM_SOFTDIRTY 0 | |
213 | #endif | |
214 | ||
b379d790 | 215 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
cc2383ec KK |
216 | #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */ |
217 | #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ | |
f8af4da3 | 218 | #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ |
1da177e4 | 219 | |
63c17fb8 DH |
220 | #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS |
221 | #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */ | |
222 | #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */ | |
223 | #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */ | |
224 | #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */ | |
df3735c5 | 225 | #define VM_HIGH_ARCH_BIT_4 36 /* bit only usable on 64-bit architectures */ |
63c17fb8 DH |
226 | #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0) |
227 | #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1) | |
228 | #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2) | |
229 | #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3) | |
df3735c5 | 230 | #define VM_HIGH_ARCH_4 BIT(VM_HIGH_ARCH_BIT_4) |
63c17fb8 DH |
231 | #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */ |
232 | ||
cc2383ec KK |
233 | #if defined(CONFIG_X86) |
234 | # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ | |
8f62c883 DH |
235 | #if defined (CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS) |
236 | # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0 | |
237 | # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */ | |
238 | # define VM_PKEY_BIT1 VM_HIGH_ARCH_1 | |
239 | # define VM_PKEY_BIT2 VM_HIGH_ARCH_2 | |
240 | # define VM_PKEY_BIT3 VM_HIGH_ARCH_3 | |
241 | #endif | |
cc2383ec KK |
242 | #elif defined(CONFIG_PPC) |
243 | # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */ | |
244 | #elif defined(CONFIG_PARISC) | |
245 | # define VM_GROWSUP VM_ARCH_1 | |
9ca52ed9 JH |
246 | #elif defined(CONFIG_METAG) |
247 | # define VM_GROWSUP VM_ARCH_1 | |
cc2383ec KK |
248 | #elif defined(CONFIG_IA64) |
249 | # define VM_GROWSUP VM_ARCH_1 | |
250 | #elif !defined(CONFIG_MMU) | |
251 | # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */ | |
252 | #endif | |
253 | ||
df3735c5 | 254 | #if defined(CONFIG_X86_INTEL_MPX) |
4aae7e43 | 255 | /* MPX specific bounds table or bounds directory */ |
fa87b91c | 256 | # define VM_MPX VM_HIGH_ARCH_4 |
df3735c5 RR |
257 | #else |
258 | # define VM_MPX VM_NONE | |
4aae7e43 QR |
259 | #endif |
260 | ||
cc2383ec KK |
261 | #ifndef VM_GROWSUP |
262 | # define VM_GROWSUP VM_NONE | |
263 | #endif | |
264 | ||
a8bef8ff MG |
265 | /* Bits set in the VMA until the stack is in its final location */ |
266 | #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) | |
267 | ||
1da177e4 LT |
268 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
269 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS | |
270 | #endif | |
271 | ||
272 | #ifdef CONFIG_STACK_GROWSUP | |
30bdbb78 | 273 | #define VM_STACK VM_GROWSUP |
1da177e4 | 274 | #else |
30bdbb78 | 275 | #define VM_STACK VM_GROWSDOWN |
1da177e4 LT |
276 | #endif |
277 | ||
30bdbb78 KK |
278 | #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
279 | ||
b291f000 | 280 | /* |
78f11a25 AA |
281 | * Special vmas that are non-mergable, non-mlock()able. |
282 | * Note: mm/huge_memory.c VM_NO_THP depends on this definition. | |
b291f000 | 283 | */ |
9050d7eb | 284 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP) |
b291f000 | 285 | |
a0715cc2 AT |
286 | /* This mask defines which mm->def_flags a process can inherit its parent */ |
287 | #define VM_INIT_DEF_MASK VM_NOHUGEPAGE | |
288 | ||
de60f5f1 EM |
289 | /* This mask is used to clear all the VMA flags used by mlock */ |
290 | #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT)) | |
291 | ||
1da177e4 LT |
292 | /* |
293 | * mapping from the currently active vm_flags protection bits (the | |
294 | * low four bits) to a page protection mask.. | |
295 | */ | |
296 | extern pgprot_t protection_map[16]; | |
297 | ||
d0217ac0 | 298 | #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ |
9b4bdd2f KS |
299 | #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */ |
300 | #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */ | |
301 | #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */ | |
302 | #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */ | |
303 | #define FAULT_FLAG_TRIED 0x20 /* Second try */ | |
304 | #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */ | |
1b2ee126 | 305 | #define FAULT_FLAG_REMOTE 0x80 /* faulting for non current tsk/mm */ |
d61172b4 | 306 | #define FAULT_FLAG_INSTRUCTION 0x100 /* The fault was during an instruction fetch */ |
d0217ac0 | 307 | |
282a8e03 RZ |
308 | #define FAULT_FLAG_TRACE \ |
309 | { FAULT_FLAG_WRITE, "WRITE" }, \ | |
310 | { FAULT_FLAG_MKWRITE, "MKWRITE" }, \ | |
311 | { FAULT_FLAG_ALLOW_RETRY, "ALLOW_RETRY" }, \ | |
312 | { FAULT_FLAG_RETRY_NOWAIT, "RETRY_NOWAIT" }, \ | |
313 | { FAULT_FLAG_KILLABLE, "KILLABLE" }, \ | |
314 | { FAULT_FLAG_TRIED, "TRIED" }, \ | |
315 | { FAULT_FLAG_USER, "USER" }, \ | |
316 | { FAULT_FLAG_REMOTE, "REMOTE" }, \ | |
317 | { FAULT_FLAG_INSTRUCTION, "INSTRUCTION" } | |
318 | ||
54cb8821 | 319 | /* |
d0217ac0 | 320 | * vm_fault is filled by the the pagefault handler and passed to the vma's |
83c54070 NP |
321 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
322 | * of VM_FAULT_xxx flags that give details about how the fault was handled. | |
54cb8821 | 323 | * |
c20cd45e MH |
324 | * MM layer fills up gfp_mask for page allocations but fault handler might |
325 | * alter it if its implementation requires a different allocation context. | |
326 | * | |
9b4bdd2f | 327 | * pgoff should be used in favour of virtual_address, if possible. |
54cb8821 | 328 | */ |
d0217ac0 | 329 | struct vm_fault { |
82b0f8c3 | 330 | struct vm_area_struct *vma; /* Target VMA */ |
d0217ac0 | 331 | unsigned int flags; /* FAULT_FLAG_xxx flags */ |
c20cd45e | 332 | gfp_t gfp_mask; /* gfp mask to be used for allocations */ |
d0217ac0 | 333 | pgoff_t pgoff; /* Logical page offset based on vma */ |
82b0f8c3 | 334 | unsigned long address; /* Faulting virtual address */ |
82b0f8c3 | 335 | pmd_t *pmd; /* Pointer to pmd entry matching |
2994302b | 336 | * the 'address' */ |
a2d58167 DJ |
337 | pud_t *pud; /* Pointer to pud entry matching |
338 | * the 'address' | |
339 | */ | |
2994302b | 340 | pte_t orig_pte; /* Value of PTE at the time of fault */ |
d0217ac0 | 341 | |
3917048d JK |
342 | struct page *cow_page; /* Page handler may use for COW fault */ |
343 | struct mem_cgroup *memcg; /* Cgroup cow_page belongs to */ | |
d0217ac0 | 344 | struct page *page; /* ->fault handlers should return a |
83c54070 | 345 | * page here, unless VM_FAULT_NOPAGE |
d0217ac0 | 346 | * is set (which is also implied by |
83c54070 | 347 | * VM_FAULT_ERROR). |
d0217ac0 | 348 | */ |
82b0f8c3 | 349 | /* These three entries are valid only while holding ptl lock */ |
bae473a4 KS |
350 | pte_t *pte; /* Pointer to pte entry matching |
351 | * the 'address'. NULL if the page | |
352 | * table hasn't been allocated. | |
353 | */ | |
354 | spinlock_t *ptl; /* Page table lock. | |
355 | * Protects pte page table if 'pte' | |
356 | * is not NULL, otherwise pmd. | |
357 | */ | |
7267ec00 KS |
358 | pgtable_t prealloc_pte; /* Pre-allocated pte page table. |
359 | * vm_ops->map_pages() calls | |
360 | * alloc_set_pte() from atomic context. | |
361 | * do_fault_around() pre-allocates | |
362 | * page table to avoid allocation from | |
363 | * atomic context. | |
364 | */ | |
54cb8821 | 365 | }; |
1da177e4 | 366 | |
c791ace1 DJ |
367 | /* page entry size for vm->huge_fault() */ |
368 | enum page_entry_size { | |
369 | PE_SIZE_PTE = 0, | |
370 | PE_SIZE_PMD, | |
371 | PE_SIZE_PUD, | |
372 | }; | |
373 | ||
1da177e4 LT |
374 | /* |
375 | * These are the virtual MM functions - opening of an area, closing and | |
376 | * unmapping it (needed to keep files on disk up-to-date etc), pointer | |
377 | * to the functions called when a no-page or a wp-page exception occurs. | |
378 | */ | |
379 | struct vm_operations_struct { | |
380 | void (*open)(struct vm_area_struct * area); | |
381 | void (*close)(struct vm_area_struct * area); | |
31383c68 | 382 | int (*split)(struct vm_area_struct * area, unsigned long addr); |
5477e70a | 383 | int (*mremap)(struct vm_area_struct * area); |
11bac800 | 384 | int (*fault)(struct vm_fault *vmf); |
c791ace1 | 385 | int (*huge_fault)(struct vm_fault *vmf, enum page_entry_size pe_size); |
82b0f8c3 | 386 | void (*map_pages)(struct vm_fault *vmf, |
bae473a4 | 387 | pgoff_t start_pgoff, pgoff_t end_pgoff); |
9637a5ef DH |
388 | |
389 | /* notification that a previously read-only page is about to become | |
390 | * writable, if an error is returned it will cause a SIGBUS */ | |
11bac800 | 391 | int (*page_mkwrite)(struct vm_fault *vmf); |
28b2ee20 | 392 | |
dd906184 | 393 | /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */ |
11bac800 | 394 | int (*pfn_mkwrite)(struct vm_fault *vmf); |
dd906184 | 395 | |
28b2ee20 RR |
396 | /* called by access_process_vm when get_user_pages() fails, typically |
397 | * for use by special VMAs that can switch between memory and hardware | |
398 | */ | |
399 | int (*access)(struct vm_area_struct *vma, unsigned long addr, | |
400 | void *buf, int len, int write); | |
78d683e8 AL |
401 | |
402 | /* Called by the /proc/PID/maps code to ask the vma whether it | |
403 | * has a special name. Returning non-NULL will also cause this | |
404 | * vma to be dumped unconditionally. */ | |
405 | const char *(*name)(struct vm_area_struct *vma); | |
406 | ||
1da177e4 | 407 | #ifdef CONFIG_NUMA |
a6020ed7 LS |
408 | /* |
409 | * set_policy() op must add a reference to any non-NULL @new mempolicy | |
410 | * to hold the policy upon return. Caller should pass NULL @new to | |
411 | * remove a policy and fall back to surrounding context--i.e. do not | |
412 | * install a MPOL_DEFAULT policy, nor the task or system default | |
413 | * mempolicy. | |
414 | */ | |
1da177e4 | 415 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
a6020ed7 LS |
416 | |
417 | /* | |
418 | * get_policy() op must add reference [mpol_get()] to any policy at | |
419 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure | |
420 | * in mm/mempolicy.c will do this automatically. | |
421 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not | |
422 | * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. | |
423 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op | |
424 | * must return NULL--i.e., do not "fallback" to task or system default | |
425 | * policy. | |
426 | */ | |
1da177e4 LT |
427 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
428 | unsigned long addr); | |
429 | #endif | |
667a0a06 DV |
430 | /* |
431 | * Called by vm_normal_page() for special PTEs to find the | |
432 | * page for @addr. This is useful if the default behavior | |
433 | * (using pte_page()) would not find the correct page. | |
434 | */ | |
435 | struct page *(*find_special_page)(struct vm_area_struct *vma, | |
436 | unsigned long addr); | |
1da177e4 LT |
437 | }; |
438 | ||
439 | struct mmu_gather; | |
440 | struct inode; | |
441 | ||
349aef0b AM |
442 | #define page_private(page) ((page)->private) |
443 | #define set_page_private(page, v) ((page)->private = (v)) | |
4c21e2f2 | 444 | |
5c7fb56e DW |
445 | #if !defined(__HAVE_ARCH_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE) |
446 | static inline int pmd_devmap(pmd_t pmd) | |
447 | { | |
448 | return 0; | |
449 | } | |
a00cc7d9 MW |
450 | static inline int pud_devmap(pud_t pud) |
451 | { | |
452 | return 0; | |
453 | } | |
b59f65fa KS |
454 | static inline int pgd_devmap(pgd_t pgd) |
455 | { | |
456 | return 0; | |
457 | } | |
5c7fb56e DW |
458 | #endif |
459 | ||
1da177e4 LT |
460 | /* |
461 | * FIXME: take this include out, include page-flags.h in | |
462 | * files which need it (119 of them) | |
463 | */ | |
464 | #include <linux/page-flags.h> | |
71e3aac0 | 465 | #include <linux/huge_mm.h> |
1da177e4 LT |
466 | |
467 | /* | |
468 | * Methods to modify the page usage count. | |
469 | * | |
470 | * What counts for a page usage: | |
471 | * - cache mapping (page->mapping) | |
472 | * - private data (page->private) | |
473 | * - page mapped in a task's page tables, each mapping | |
474 | * is counted separately | |
475 | * | |
476 | * Also, many kernel routines increase the page count before a critical | |
477 | * routine so they can be sure the page doesn't go away from under them. | |
1da177e4 LT |
478 | */ |
479 | ||
480 | /* | |
da6052f7 | 481 | * Drop a ref, return true if the refcount fell to zero (the page has no users) |
1da177e4 | 482 | */ |
7c8ee9a8 NP |
483 | static inline int put_page_testzero(struct page *page) |
484 | { | |
fe896d18 JK |
485 | VM_BUG_ON_PAGE(page_ref_count(page) == 0, page); |
486 | return page_ref_dec_and_test(page); | |
7c8ee9a8 | 487 | } |
1da177e4 LT |
488 | |
489 | /* | |
7c8ee9a8 NP |
490 | * Try to grab a ref unless the page has a refcount of zero, return false if |
491 | * that is the case. | |
8e0861fa AK |
492 | * This can be called when MMU is off so it must not access |
493 | * any of the virtual mappings. | |
1da177e4 | 494 | */ |
7c8ee9a8 NP |
495 | static inline int get_page_unless_zero(struct page *page) |
496 | { | |
fe896d18 | 497 | return page_ref_add_unless(page, 1, 0); |
7c8ee9a8 | 498 | } |
1da177e4 | 499 | |
53df8fdc | 500 | extern int page_is_ram(unsigned long pfn); |
124fe20d DW |
501 | |
502 | enum { | |
503 | REGION_INTERSECTS, | |
504 | REGION_DISJOINT, | |
505 | REGION_MIXED, | |
506 | }; | |
507 | ||
1c29f25b TK |
508 | int region_intersects(resource_size_t offset, size_t size, unsigned long flags, |
509 | unsigned long desc); | |
53df8fdc | 510 | |
48667e7a | 511 | /* Support for virtually mapped pages */ |
b3bdda02 CL |
512 | struct page *vmalloc_to_page(const void *addr); |
513 | unsigned long vmalloc_to_pfn(const void *addr); | |
48667e7a | 514 | |
0738c4bb PM |
515 | /* |
516 | * Determine if an address is within the vmalloc range | |
517 | * | |
518 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there | |
519 | * is no special casing required. | |
520 | */ | |
bb00a789 | 521 | static inline bool is_vmalloc_addr(const void *x) |
9e2779fa | 522 | { |
0738c4bb | 523 | #ifdef CONFIG_MMU |
9e2779fa CL |
524 | unsigned long addr = (unsigned long)x; |
525 | ||
526 | return addr >= VMALLOC_START && addr < VMALLOC_END; | |
0738c4bb | 527 | #else |
bb00a789 | 528 | return false; |
8ca3ed87 | 529 | #endif |
0738c4bb | 530 | } |
81ac3ad9 KH |
531 | #ifdef CONFIG_MMU |
532 | extern int is_vmalloc_or_module_addr(const void *x); | |
533 | #else | |
934831d0 | 534 | static inline int is_vmalloc_or_module_addr(const void *x) |
81ac3ad9 KH |
535 | { |
536 | return 0; | |
537 | } | |
538 | #endif | |
9e2779fa | 539 | |
a7c3e901 MH |
540 | extern void *kvmalloc_node(size_t size, gfp_t flags, int node); |
541 | static inline void *kvmalloc(size_t size, gfp_t flags) | |
542 | { | |
543 | return kvmalloc_node(size, flags, NUMA_NO_NODE); | |
544 | } | |
545 | static inline void *kvzalloc_node(size_t size, gfp_t flags, int node) | |
546 | { | |
547 | return kvmalloc_node(size, flags | __GFP_ZERO, node); | |
548 | } | |
549 | static inline void *kvzalloc(size_t size, gfp_t flags) | |
550 | { | |
551 | return kvmalloc(size, flags | __GFP_ZERO); | |
552 | } | |
553 | ||
752ade68 MH |
554 | static inline void *kvmalloc_array(size_t n, size_t size, gfp_t flags) |
555 | { | |
556 | if (size != 0 && n > SIZE_MAX / size) | |
557 | return NULL; | |
558 | ||
559 | return kvmalloc(n * size, flags); | |
560 | } | |
561 | ||
39f1f78d AV |
562 | extern void kvfree(const void *addr); |
563 | ||
53f9263b KS |
564 | static inline atomic_t *compound_mapcount_ptr(struct page *page) |
565 | { | |
566 | return &page[1].compound_mapcount; | |
567 | } | |
568 | ||
569 | static inline int compound_mapcount(struct page *page) | |
570 | { | |
5f527c2b | 571 | VM_BUG_ON_PAGE(!PageCompound(page), page); |
53f9263b KS |
572 | page = compound_head(page); |
573 | return atomic_read(compound_mapcount_ptr(page)) + 1; | |
574 | } | |
575 | ||
70b50f94 AA |
576 | /* |
577 | * The atomic page->_mapcount, starts from -1: so that transitions | |
578 | * both from it and to it can be tracked, using atomic_inc_and_test | |
579 | * and atomic_add_negative(-1). | |
580 | */ | |
22b751c3 | 581 | static inline void page_mapcount_reset(struct page *page) |
70b50f94 AA |
582 | { |
583 | atomic_set(&(page)->_mapcount, -1); | |
584 | } | |
585 | ||
b20ce5e0 KS |
586 | int __page_mapcount(struct page *page); |
587 | ||
70b50f94 AA |
588 | static inline int page_mapcount(struct page *page) |
589 | { | |
1d148e21 | 590 | VM_BUG_ON_PAGE(PageSlab(page), page); |
53f9263b | 591 | |
b20ce5e0 KS |
592 | if (unlikely(PageCompound(page))) |
593 | return __page_mapcount(page); | |
594 | return atomic_read(&page->_mapcount) + 1; | |
595 | } | |
596 | ||
597 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
598 | int total_mapcount(struct page *page); | |
6d0a07ed | 599 | int page_trans_huge_mapcount(struct page *page, int *total_mapcount); |
b20ce5e0 KS |
600 | #else |
601 | static inline int total_mapcount(struct page *page) | |
602 | { | |
603 | return page_mapcount(page); | |
70b50f94 | 604 | } |
6d0a07ed AA |
605 | static inline int page_trans_huge_mapcount(struct page *page, |
606 | int *total_mapcount) | |
607 | { | |
608 | int mapcount = page_mapcount(page); | |
609 | if (total_mapcount) | |
610 | *total_mapcount = mapcount; | |
611 | return mapcount; | |
612 | } | |
b20ce5e0 | 613 | #endif |
70b50f94 | 614 | |
b49af68f CL |
615 | static inline struct page *virt_to_head_page(const void *x) |
616 | { | |
617 | struct page *page = virt_to_page(x); | |
ccaafd7f | 618 | |
1d798ca3 | 619 | return compound_head(page); |
b49af68f CL |
620 | } |
621 | ||
ddc58f27 KS |
622 | void __put_page(struct page *page); |
623 | ||
1d7ea732 | 624 | void put_pages_list(struct list_head *pages); |
1da177e4 | 625 | |
8dfcc9ba | 626 | void split_page(struct page *page, unsigned int order); |
8dfcc9ba | 627 | |
33f2ef89 AW |
628 | /* |
629 | * Compound pages have a destructor function. Provide a | |
630 | * prototype for that function and accessor functions. | |
f1e61557 | 631 | * These are _only_ valid on the head of a compound page. |
33f2ef89 | 632 | */ |
f1e61557 KS |
633 | typedef void compound_page_dtor(struct page *); |
634 | ||
635 | /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */ | |
636 | enum compound_dtor_id { | |
637 | NULL_COMPOUND_DTOR, | |
638 | COMPOUND_PAGE_DTOR, | |
639 | #ifdef CONFIG_HUGETLB_PAGE | |
640 | HUGETLB_PAGE_DTOR, | |
9a982250 KS |
641 | #endif |
642 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
643 | TRANSHUGE_PAGE_DTOR, | |
f1e61557 KS |
644 | #endif |
645 | NR_COMPOUND_DTORS, | |
646 | }; | |
647 | extern compound_page_dtor * const compound_page_dtors[]; | |
33f2ef89 AW |
648 | |
649 | static inline void set_compound_page_dtor(struct page *page, | |
f1e61557 | 650 | enum compound_dtor_id compound_dtor) |
33f2ef89 | 651 | { |
f1e61557 KS |
652 | VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page); |
653 | page[1].compound_dtor = compound_dtor; | |
33f2ef89 AW |
654 | } |
655 | ||
656 | static inline compound_page_dtor *get_compound_page_dtor(struct page *page) | |
657 | { | |
f1e61557 KS |
658 | VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page); |
659 | return compound_page_dtors[page[1].compound_dtor]; | |
33f2ef89 AW |
660 | } |
661 | ||
d00181b9 | 662 | static inline unsigned int compound_order(struct page *page) |
d85f3385 | 663 | { |
6d777953 | 664 | if (!PageHead(page)) |
d85f3385 | 665 | return 0; |
e4b294c2 | 666 | return page[1].compound_order; |
d85f3385 CL |
667 | } |
668 | ||
f1e61557 | 669 | static inline void set_compound_order(struct page *page, unsigned int order) |
d85f3385 | 670 | { |
e4b294c2 | 671 | page[1].compound_order = order; |
d85f3385 CL |
672 | } |
673 | ||
9a982250 KS |
674 | void free_compound_page(struct page *page); |
675 | ||
3dece370 | 676 | #ifdef CONFIG_MMU |
14fd403f AA |
677 | /* |
678 | * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when | |
679 | * servicing faults for write access. In the normal case, do always want | |
680 | * pte_mkwrite. But get_user_pages can cause write faults for mappings | |
681 | * that do not have writing enabled, when used by access_process_vm. | |
682 | */ | |
683 | static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) | |
684 | { | |
685 | if (likely(vma->vm_flags & VM_WRITE)) | |
686 | pte = pte_mkwrite(pte); | |
687 | return pte; | |
688 | } | |
8c6e50b0 | 689 | |
82b0f8c3 | 690 | int alloc_set_pte(struct vm_fault *vmf, struct mem_cgroup *memcg, |
7267ec00 | 691 | struct page *page); |
9118c0cb | 692 | int finish_fault(struct vm_fault *vmf); |
66a6197c | 693 | int finish_mkwrite_fault(struct vm_fault *vmf); |
3dece370 | 694 | #endif |
14fd403f | 695 | |
1da177e4 LT |
696 | /* |
697 | * Multiple processes may "see" the same page. E.g. for untouched | |
698 | * mappings of /dev/null, all processes see the same page full of | |
699 | * zeroes, and text pages of executables and shared libraries have | |
700 | * only one copy in memory, at most, normally. | |
701 | * | |
702 | * For the non-reserved pages, page_count(page) denotes a reference count. | |
7e871b6c PBG |
703 | * page_count() == 0 means the page is free. page->lru is then used for |
704 | * freelist management in the buddy allocator. | |
da6052f7 | 705 | * page_count() > 0 means the page has been allocated. |
1da177e4 | 706 | * |
da6052f7 NP |
707 | * Pages are allocated by the slab allocator in order to provide memory |
708 | * to kmalloc and kmem_cache_alloc. In this case, the management of the | |
709 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c | |
710 | * unless a particular usage is carefully commented. (the responsibility of | |
711 | * freeing the kmalloc memory is the caller's, of course). | |
1da177e4 | 712 | * |
da6052f7 NP |
713 | * A page may be used by anyone else who does a __get_free_page(). |
714 | * In this case, page_count still tracks the references, and should only | |
715 | * be used through the normal accessor functions. The top bits of page->flags | |
716 | * and page->virtual store page management information, but all other fields | |
717 | * are unused and could be used privately, carefully. The management of this | |
718 | * page is the responsibility of the one who allocated it, and those who have | |
719 | * subsequently been given references to it. | |
720 | * | |
721 | * The other pages (we may call them "pagecache pages") are completely | |
1da177e4 LT |
722 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
723 | * The following discussion applies only to them. | |
724 | * | |
da6052f7 NP |
725 | * A pagecache page contains an opaque `private' member, which belongs to the |
726 | * page's address_space. Usually, this is the address of a circular list of | |
727 | * the page's disk buffers. PG_private must be set to tell the VM to call | |
728 | * into the filesystem to release these pages. | |
1da177e4 | 729 | * |
da6052f7 NP |
730 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
731 | * is the pointer to the inode, and page->index is the file offset of the page, | |
ea1754a0 | 732 | * in units of PAGE_SIZE. |
1da177e4 | 733 | * |
da6052f7 NP |
734 | * If pagecache pages are not associated with an inode, they are said to be |
735 | * anonymous pages. These may become associated with the swapcache, and in that | |
736 | * case PG_swapcache is set, and page->private is an offset into the swapcache. | |
1da177e4 | 737 | * |
da6052f7 NP |
738 | * In either case (swapcache or inode backed), the pagecache itself holds one |
739 | * reference to the page. Setting PG_private should also increment the | |
740 | * refcount. The each user mapping also has a reference to the page. | |
1da177e4 | 741 | * |
da6052f7 NP |
742 | * The pagecache pages are stored in a per-mapping radix tree, which is |
743 | * rooted at mapping->page_tree, and indexed by offset. | |
744 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space | |
745 | * lists, we instead now tag pages as dirty/writeback in the radix tree. | |
1da177e4 | 746 | * |
da6052f7 | 747 | * All pagecache pages may be subject to I/O: |
1da177e4 LT |
748 | * - inode pages may need to be read from disk, |
749 | * - inode pages which have been modified and are MAP_SHARED may need | |
da6052f7 NP |
750 | * to be written back to the inode on disk, |
751 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been | |
752 | * modified may need to be swapped out to swap space and (later) to be read | |
753 | * back into memory. | |
1da177e4 LT |
754 | */ |
755 | ||
756 | /* | |
757 | * The zone field is never updated after free_area_init_core() | |
758 | * sets it, so none of the operations on it need to be atomic. | |
1da177e4 | 759 | */ |
348f8b6c | 760 | |
90572890 | 761 | /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */ |
07808b74 | 762 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
d41dee36 AW |
763 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
764 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) | |
90572890 | 765 | #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH) |
d41dee36 | 766 | |
348f8b6c | 767 | /* |
25985edc | 768 | * Define the bit shifts to access each section. For non-existent |
348f8b6c DH |
769 | * sections we define the shift as 0; that plus a 0 mask ensures |
770 | * the compiler will optimise away reference to them. | |
771 | */ | |
d41dee36 AW |
772 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
773 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) | |
774 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) | |
90572890 | 775 | #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0)) |
348f8b6c | 776 | |
bce54bbf WD |
777 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ |
778 | #ifdef NODE_NOT_IN_PAGE_FLAGS | |
89689ae7 | 779 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
780 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
781 | SECTIONS_PGOFF : ZONES_PGOFF) | |
d41dee36 | 782 | #else |
89689ae7 | 783 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
784 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
785 | NODES_PGOFF : ZONES_PGOFF) | |
89689ae7 CL |
786 | #endif |
787 | ||
bd8029b6 | 788 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
348f8b6c | 789 | |
9223b419 CL |
790 | #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
791 | #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS | |
348f8b6c DH |
792 | #endif |
793 | ||
d41dee36 AW |
794 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
795 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) | |
796 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) | |
834a964a | 797 | #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1) |
89689ae7 | 798 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
348f8b6c | 799 | |
33dd4e0e | 800 | static inline enum zone_type page_zonenum(const struct page *page) |
1da177e4 | 801 | { |
348f8b6c | 802 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
1da177e4 | 803 | } |
1da177e4 | 804 | |
260ae3f7 DW |
805 | #ifdef CONFIG_ZONE_DEVICE |
806 | static inline bool is_zone_device_page(const struct page *page) | |
807 | { | |
808 | return page_zonenum(page) == ZONE_DEVICE; | |
809 | } | |
810 | #else | |
811 | static inline bool is_zone_device_page(const struct page *page) | |
812 | { | |
813 | return false; | |
814 | } | |
7b2d55d2 | 815 | #endif |
5042db43 | 816 | |
6b368cd4 | 817 | #if defined(CONFIG_DEVICE_PRIVATE) || defined(CONFIG_DEVICE_PUBLIC) |
df6ad698 | 818 | void put_zone_device_private_or_public_page(struct page *page); |
6b368cd4 JG |
819 | DECLARE_STATIC_KEY_FALSE(device_private_key); |
820 | #define IS_HMM_ENABLED static_branch_unlikely(&device_private_key) | |
821 | static inline bool is_device_private_page(const struct page *page); | |
822 | static inline bool is_device_public_page(const struct page *page); | |
823 | #else /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */ | |
df6ad698 | 824 | static inline void put_zone_device_private_or_public_page(struct page *page) |
5042db43 | 825 | { |
5042db43 | 826 | } |
6b368cd4 JG |
827 | #define IS_HMM_ENABLED 0 |
828 | static inline bool is_device_private_page(const struct page *page) | |
829 | { | |
830 | return false; | |
831 | } | |
832 | static inline bool is_device_public_page(const struct page *page) | |
833 | { | |
834 | return false; | |
835 | } | |
df6ad698 | 836 | #endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */ |
260ae3f7 | 837 | |
7b2d55d2 | 838 | |
7d225d5f LT |
839 | /* 127: arbitrary random number, small enough to assemble well */ |
840 | #define page_ref_zero_or_close_to_overflow(page) \ | |
841 | ((unsigned int) page_ref_count(page) + 127u <= 127u) | |
842 | ||
3565fce3 DW |
843 | static inline void get_page(struct page *page) |
844 | { | |
845 | page = compound_head(page); | |
846 | /* | |
847 | * Getting a normal page or the head of a compound page | |
0139aa7b | 848 | * requires to already have an elevated page->_refcount. |
3565fce3 | 849 | */ |
7d225d5f | 850 | VM_BUG_ON_PAGE(page_ref_zero_or_close_to_overflow(page), page); |
fe896d18 | 851 | page_ref_inc(page); |
3565fce3 DW |
852 | } |
853 | ||
854 | static inline void put_page(struct page *page) | |
855 | { | |
856 | page = compound_head(page); | |
857 | ||
7b2d55d2 JG |
858 | /* |
859 | * For private device pages we need to catch refcount transition from | |
860 | * 2 to 1, when refcount reach one it means the private device page is | |
861 | * free and we need to inform the device driver through callback. See | |
862 | * include/linux/memremap.h and HMM for details. | |
863 | */ | |
6b368cd4 JG |
864 | if (IS_HMM_ENABLED && unlikely(is_device_private_page(page) || |
865 | unlikely(is_device_public_page(page)))) { | |
df6ad698 | 866 | put_zone_device_private_or_public_page(page); |
7b2d55d2 JG |
867 | return; |
868 | } | |
869 | ||
3565fce3 DW |
870 | if (put_page_testzero(page)) |
871 | __put_page(page); | |
3565fce3 DW |
872 | } |
873 | ||
9127ab4f CS |
874 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
875 | #define SECTION_IN_PAGE_FLAGS | |
876 | #endif | |
877 | ||
89689ae7 | 878 | /* |
7a8010cd VB |
879 | * The identification function is mainly used by the buddy allocator for |
880 | * determining if two pages could be buddies. We are not really identifying | |
881 | * the zone since we could be using the section number id if we do not have | |
882 | * node id available in page flags. | |
883 | * We only guarantee that it will return the same value for two combinable | |
884 | * pages in a zone. | |
89689ae7 | 885 | */ |
cb2b95e1 AW |
886 | static inline int page_zone_id(struct page *page) |
887 | { | |
89689ae7 | 888 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
348f8b6c DH |
889 | } |
890 | ||
25ba77c1 | 891 | static inline int zone_to_nid(struct zone *zone) |
89fa3024 | 892 | { |
d5f541ed CL |
893 | #ifdef CONFIG_NUMA |
894 | return zone->node; | |
895 | #else | |
896 | return 0; | |
897 | #endif | |
89fa3024 CL |
898 | } |
899 | ||
89689ae7 | 900 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
33dd4e0e | 901 | extern int page_to_nid(const struct page *page); |
89689ae7 | 902 | #else |
33dd4e0e | 903 | static inline int page_to_nid(const struct page *page) |
d41dee36 | 904 | { |
89689ae7 | 905 | return (page->flags >> NODES_PGSHIFT) & NODES_MASK; |
d41dee36 | 906 | } |
89689ae7 CL |
907 | #endif |
908 | ||
57e0a030 | 909 | #ifdef CONFIG_NUMA_BALANCING |
90572890 | 910 | static inline int cpu_pid_to_cpupid(int cpu, int pid) |
57e0a030 | 911 | { |
90572890 | 912 | return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK); |
57e0a030 MG |
913 | } |
914 | ||
90572890 | 915 | static inline int cpupid_to_pid(int cpupid) |
57e0a030 | 916 | { |
90572890 | 917 | return cpupid & LAST__PID_MASK; |
57e0a030 | 918 | } |
b795854b | 919 | |
90572890 | 920 | static inline int cpupid_to_cpu(int cpupid) |
b795854b | 921 | { |
90572890 | 922 | return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK; |
b795854b MG |
923 | } |
924 | ||
90572890 | 925 | static inline int cpupid_to_nid(int cpupid) |
b795854b | 926 | { |
90572890 | 927 | return cpu_to_node(cpupid_to_cpu(cpupid)); |
b795854b MG |
928 | } |
929 | ||
90572890 | 930 | static inline bool cpupid_pid_unset(int cpupid) |
57e0a030 | 931 | { |
90572890 | 932 | return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK); |
b795854b MG |
933 | } |
934 | ||
90572890 | 935 | static inline bool cpupid_cpu_unset(int cpupid) |
b795854b | 936 | { |
90572890 | 937 | return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK); |
b795854b MG |
938 | } |
939 | ||
8c8a743c PZ |
940 | static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid) |
941 | { | |
942 | return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid); | |
943 | } | |
944 | ||
945 | #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid) | |
90572890 PZ |
946 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
947 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
b795854b | 948 | { |
1ae71d03 | 949 | return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK); |
b795854b | 950 | } |
90572890 PZ |
951 | |
952 | static inline int page_cpupid_last(struct page *page) | |
953 | { | |
954 | return page->_last_cpupid; | |
955 | } | |
956 | static inline void page_cpupid_reset_last(struct page *page) | |
b795854b | 957 | { |
1ae71d03 | 958 | page->_last_cpupid = -1 & LAST_CPUPID_MASK; |
57e0a030 MG |
959 | } |
960 | #else | |
90572890 | 961 | static inline int page_cpupid_last(struct page *page) |
75980e97 | 962 | { |
90572890 | 963 | return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK; |
75980e97 PZ |
964 | } |
965 | ||
90572890 | 966 | extern int page_cpupid_xchg_last(struct page *page, int cpupid); |
75980e97 | 967 | |
90572890 | 968 | static inline void page_cpupid_reset_last(struct page *page) |
75980e97 | 969 | { |
09940a4f | 970 | page->flags |= LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT; |
75980e97 | 971 | } |
90572890 PZ |
972 | #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */ |
973 | #else /* !CONFIG_NUMA_BALANCING */ | |
974 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
57e0a030 | 975 | { |
90572890 | 976 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
977 | } |
978 | ||
90572890 | 979 | static inline int page_cpupid_last(struct page *page) |
57e0a030 | 980 | { |
90572890 | 981 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
982 | } |
983 | ||
90572890 | 984 | static inline int cpupid_to_nid(int cpupid) |
b795854b MG |
985 | { |
986 | return -1; | |
987 | } | |
988 | ||
90572890 | 989 | static inline int cpupid_to_pid(int cpupid) |
b795854b MG |
990 | { |
991 | return -1; | |
992 | } | |
993 | ||
90572890 | 994 | static inline int cpupid_to_cpu(int cpupid) |
b795854b MG |
995 | { |
996 | return -1; | |
997 | } | |
998 | ||
90572890 PZ |
999 | static inline int cpu_pid_to_cpupid(int nid, int pid) |
1000 | { | |
1001 | return -1; | |
1002 | } | |
1003 | ||
1004 | static inline bool cpupid_pid_unset(int cpupid) | |
b795854b MG |
1005 | { |
1006 | return 1; | |
1007 | } | |
1008 | ||
90572890 | 1009 | static inline void page_cpupid_reset_last(struct page *page) |
57e0a030 MG |
1010 | { |
1011 | } | |
8c8a743c PZ |
1012 | |
1013 | static inline bool cpupid_match_pid(struct task_struct *task, int cpupid) | |
1014 | { | |
1015 | return false; | |
1016 | } | |
90572890 | 1017 | #endif /* CONFIG_NUMA_BALANCING */ |
57e0a030 | 1018 | |
33dd4e0e | 1019 | static inline struct zone *page_zone(const struct page *page) |
89689ae7 CL |
1020 | { |
1021 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; | |
1022 | } | |
1023 | ||
75ef7184 MG |
1024 | static inline pg_data_t *page_pgdat(const struct page *page) |
1025 | { | |
1026 | return NODE_DATA(page_to_nid(page)); | |
1027 | } | |
1028 | ||
9127ab4f | 1029 | #ifdef SECTION_IN_PAGE_FLAGS |
bf4e8902 DK |
1030 | static inline void set_page_section(struct page *page, unsigned long section) |
1031 | { | |
1032 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); | |
1033 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; | |
1034 | } | |
1035 | ||
aa462abe | 1036 | static inline unsigned long page_to_section(const struct page *page) |
d41dee36 AW |
1037 | { |
1038 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; | |
1039 | } | |
308c05e3 | 1040 | #endif |
d41dee36 | 1041 | |
2f1b6248 | 1042 | static inline void set_page_zone(struct page *page, enum zone_type zone) |
348f8b6c DH |
1043 | { |
1044 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); | |
1045 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; | |
1046 | } | |
2f1b6248 | 1047 | |
348f8b6c DH |
1048 | static inline void set_page_node(struct page *page, unsigned long node) |
1049 | { | |
1050 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); | |
1051 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; | |
1da177e4 | 1052 | } |
89689ae7 | 1053 | |
2f1b6248 | 1054 | static inline void set_page_links(struct page *page, enum zone_type zone, |
d41dee36 | 1055 | unsigned long node, unsigned long pfn) |
1da177e4 | 1056 | { |
348f8b6c DH |
1057 | set_page_zone(page, zone); |
1058 | set_page_node(page, node); | |
9127ab4f | 1059 | #ifdef SECTION_IN_PAGE_FLAGS |
d41dee36 | 1060 | set_page_section(page, pfn_to_section_nr(pfn)); |
bf4e8902 | 1061 | #endif |
1da177e4 LT |
1062 | } |
1063 | ||
0610c25d GT |
1064 | #ifdef CONFIG_MEMCG |
1065 | static inline struct mem_cgroup *page_memcg(struct page *page) | |
1066 | { | |
1067 | return page->mem_cgroup; | |
1068 | } | |
55779ec7 JW |
1069 | static inline struct mem_cgroup *page_memcg_rcu(struct page *page) |
1070 | { | |
1071 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
1072 | return READ_ONCE(page->mem_cgroup); | |
1073 | } | |
0610c25d GT |
1074 | #else |
1075 | static inline struct mem_cgroup *page_memcg(struct page *page) | |
1076 | { | |
1077 | return NULL; | |
1078 | } | |
55779ec7 JW |
1079 | static inline struct mem_cgroup *page_memcg_rcu(struct page *page) |
1080 | { | |
1081 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
1082 | return NULL; | |
1083 | } | |
0610c25d GT |
1084 | #endif |
1085 | ||
f6ac2354 CL |
1086 | /* |
1087 | * Some inline functions in vmstat.h depend on page_zone() | |
1088 | */ | |
1089 | #include <linux/vmstat.h> | |
1090 | ||
33dd4e0e | 1091 | static __always_inline void *lowmem_page_address(const struct page *page) |
1da177e4 | 1092 | { |
1dff8083 | 1093 | return page_to_virt(page); |
1da177e4 LT |
1094 | } |
1095 | ||
1096 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) | |
1097 | #define HASHED_PAGE_VIRTUAL | |
1098 | #endif | |
1099 | ||
1100 | #if defined(WANT_PAGE_VIRTUAL) | |
f92f455f GU |
1101 | static inline void *page_address(const struct page *page) |
1102 | { | |
1103 | return page->virtual; | |
1104 | } | |
1105 | static inline void set_page_address(struct page *page, void *address) | |
1106 | { | |
1107 | page->virtual = address; | |
1108 | } | |
1da177e4 LT |
1109 | #define page_address_init() do { } while(0) |
1110 | #endif | |
1111 | ||
1112 | #if defined(HASHED_PAGE_VIRTUAL) | |
f9918794 | 1113 | void *page_address(const struct page *page); |
1da177e4 LT |
1114 | void set_page_address(struct page *page, void *virtual); |
1115 | void page_address_init(void); | |
1116 | #endif | |
1117 | ||
1118 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) | |
1119 | #define page_address(page) lowmem_page_address(page) | |
1120 | #define set_page_address(page, address) do { } while(0) | |
1121 | #define page_address_init() do { } while(0) | |
1122 | #endif | |
1123 | ||
e39155ea KS |
1124 | extern void *page_rmapping(struct page *page); |
1125 | extern struct anon_vma *page_anon_vma(struct page *page); | |
9800339b | 1126 | extern struct address_space *page_mapping(struct page *page); |
1da177e4 | 1127 | |
f981c595 MG |
1128 | extern struct address_space *__page_file_mapping(struct page *); |
1129 | ||
1130 | static inline | |
1131 | struct address_space *page_file_mapping(struct page *page) | |
1132 | { | |
1133 | if (unlikely(PageSwapCache(page))) | |
1134 | return __page_file_mapping(page); | |
1135 | ||
1136 | return page->mapping; | |
1137 | } | |
1138 | ||
f6ab1f7f HY |
1139 | extern pgoff_t __page_file_index(struct page *page); |
1140 | ||
1da177e4 LT |
1141 | /* |
1142 | * Return the pagecache index of the passed page. Regular pagecache pages | |
f6ab1f7f | 1143 | * use ->index whereas swapcache pages use swp_offset(->private) |
1da177e4 LT |
1144 | */ |
1145 | static inline pgoff_t page_index(struct page *page) | |
1146 | { | |
1147 | if (unlikely(PageSwapCache(page))) | |
f6ab1f7f | 1148 | return __page_file_index(page); |
1da177e4 LT |
1149 | return page->index; |
1150 | } | |
1151 | ||
1aa8aea5 | 1152 | bool page_mapped(struct page *page); |
bda807d4 | 1153 | struct address_space *page_mapping(struct page *page); |
1da177e4 | 1154 | |
2f064f34 MH |
1155 | /* |
1156 | * Return true only if the page has been allocated with | |
1157 | * ALLOC_NO_WATERMARKS and the low watermark was not | |
1158 | * met implying that the system is under some pressure. | |
1159 | */ | |
1160 | static inline bool page_is_pfmemalloc(struct page *page) | |
1161 | { | |
1162 | /* | |
1163 | * Page index cannot be this large so this must be | |
1164 | * a pfmemalloc page. | |
1165 | */ | |
1166 | return page->index == -1UL; | |
1167 | } | |
1168 | ||
1169 | /* | |
1170 | * Only to be called by the page allocator on a freshly allocated | |
1171 | * page. | |
1172 | */ | |
1173 | static inline void set_page_pfmemalloc(struct page *page) | |
1174 | { | |
1175 | page->index = -1UL; | |
1176 | } | |
1177 | ||
1178 | static inline void clear_page_pfmemalloc(struct page *page) | |
1179 | { | |
1180 | page->index = 0; | |
1181 | } | |
1182 | ||
1da177e4 LT |
1183 | /* |
1184 | * Different kinds of faults, as returned by handle_mm_fault(). | |
1185 | * Used to decide whether a process gets delivered SIGBUS or | |
1186 | * just gets major/minor fault counters bumped up. | |
1187 | */ | |
d0217ac0 | 1188 | |
83c54070 NP |
1189 | #define VM_FAULT_OOM 0x0001 |
1190 | #define VM_FAULT_SIGBUS 0x0002 | |
1191 | #define VM_FAULT_MAJOR 0x0004 | |
1192 | #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ | |
aa50d3a7 AK |
1193 | #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */ |
1194 | #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */ | |
33692f27 | 1195 | #define VM_FAULT_SIGSEGV 0x0040 |
f33ea7f4 | 1196 | |
83c54070 NP |
1197 | #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ |
1198 | #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ | |
d065bd81 | 1199 | #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */ |
c0292554 | 1200 | #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */ |
b1aa812b | 1201 | #define VM_FAULT_DONE_COW 0x1000 /* ->fault has fully handled COW */ |
caa51d26 JK |
1202 | #define VM_FAULT_NEEDDSYNC 0x2000 /* ->fault did not modify page tables |
1203 | * and needs fsync() to complete (for | |
1204 | * synchronous page faults in DAX) */ | |
aa50d3a7 | 1205 | |
33692f27 LT |
1206 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \ |
1207 | VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \ | |
1208 | VM_FAULT_FALLBACK) | |
aa50d3a7 | 1209 | |
282a8e03 RZ |
1210 | #define VM_FAULT_RESULT_TRACE \ |
1211 | { VM_FAULT_OOM, "OOM" }, \ | |
1212 | { VM_FAULT_SIGBUS, "SIGBUS" }, \ | |
1213 | { VM_FAULT_MAJOR, "MAJOR" }, \ | |
1214 | { VM_FAULT_WRITE, "WRITE" }, \ | |
1215 | { VM_FAULT_HWPOISON, "HWPOISON" }, \ | |
1216 | { VM_FAULT_HWPOISON_LARGE, "HWPOISON_LARGE" }, \ | |
1217 | { VM_FAULT_SIGSEGV, "SIGSEGV" }, \ | |
1218 | { VM_FAULT_NOPAGE, "NOPAGE" }, \ | |
1219 | { VM_FAULT_LOCKED, "LOCKED" }, \ | |
1220 | { VM_FAULT_RETRY, "RETRY" }, \ | |
1221 | { VM_FAULT_FALLBACK, "FALLBACK" }, \ | |
caa51d26 JK |
1222 | { VM_FAULT_DONE_COW, "DONE_COW" }, \ |
1223 | { VM_FAULT_NEEDDSYNC, "NEEDDSYNC" } | |
282a8e03 | 1224 | |
aa50d3a7 AK |
1225 | /* Encode hstate index for a hwpoisoned large page */ |
1226 | #define VM_FAULT_SET_HINDEX(x) ((x) << 12) | |
1227 | #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf) | |
d0217ac0 | 1228 | |
1c0fe6e3 NP |
1229 | /* |
1230 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. | |
1231 | */ | |
1232 | extern void pagefault_out_of_memory(void); | |
1233 | ||
1da177e4 LT |
1234 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
1235 | ||
ddd588b5 | 1236 | /* |
7bf02ea2 | 1237 | * Flags passed to show_mem() and show_free_areas() to suppress output in |
ddd588b5 DR |
1238 | * various contexts. |
1239 | */ | |
4b59e6c4 | 1240 | #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */ |
ddd588b5 | 1241 | |
9af744d7 | 1242 | extern void show_free_areas(unsigned int flags, nodemask_t *nodemask); |
1da177e4 | 1243 | |
7f43add4 | 1244 | extern bool can_do_mlock(void); |
1da177e4 LT |
1245 | extern int user_shm_lock(size_t, struct user_struct *); |
1246 | extern void user_shm_unlock(size_t, struct user_struct *); | |
1247 | ||
1248 | /* | |
1249 | * Parameter block passed down to zap_pte_range in exceptional cases. | |
1250 | */ | |
1251 | struct zap_details { | |
1da177e4 LT |
1252 | struct address_space *check_mapping; /* Check page->mapping if set */ |
1253 | pgoff_t first_index; /* Lowest page->index to unmap */ | |
1254 | pgoff_t last_index; /* Highest page->index to unmap */ | |
1da177e4 LT |
1255 | }; |
1256 | ||
df6ad698 JG |
1257 | struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
1258 | pte_t pte, bool with_public_device); | |
1259 | #define vm_normal_page(vma, addr, pte) _vm_normal_page(vma, addr, pte, false) | |
1260 | ||
28093f9f GS |
1261 | struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr, |
1262 | pmd_t pmd); | |
7e675137 | 1263 | |
c627f9cc JS |
1264 | int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
1265 | unsigned long size); | |
14f5ff5d | 1266 | void zap_page_range(struct vm_area_struct *vma, unsigned long address, |
ecf1385d | 1267 | unsigned long size); |
4f74d2c8 LT |
1268 | void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
1269 | unsigned long start, unsigned long end); | |
e6473092 MM |
1270 | |
1271 | /** | |
1272 | * mm_walk - callbacks for walk_page_range | |
a00cc7d9 MW |
1273 | * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry |
1274 | * this handler should only handle pud_trans_huge() puds. | |
1275 | * the pmd_entry or pte_entry callbacks will be used for | |
1276 | * regular PUDs. | |
e6473092 | 1277 | * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry |
03319327 DH |
1278 | * this handler is required to be able to handle |
1279 | * pmd_trans_huge() pmds. They may simply choose to | |
1280 | * split_huge_page() instead of handling it explicitly. | |
e6473092 MM |
1281 | * @pte_entry: if set, called for each non-empty PTE (4th-level) entry |
1282 | * @pte_hole: if set, called for each hole at all levels | |
5dc37642 | 1283 | * @hugetlb_entry: if set, called for each hugetlb entry |
fafaa426 | 1284 | * @test_walk: caller specific callback function to determine whether |
f7e2355f | 1285 | * we walk over the current vma or not. Returning 0 |
fafaa426 NH |
1286 | * value means "do page table walk over the current vma," |
1287 | * and a negative one means "abort current page table walk | |
f7e2355f | 1288 | * right now." 1 means "skip the current vma." |
fafaa426 NH |
1289 | * @mm: mm_struct representing the target process of page table walk |
1290 | * @vma: vma currently walked (NULL if walking outside vmas) | |
1291 | * @private: private data for callbacks' usage | |
e6473092 | 1292 | * |
fafaa426 | 1293 | * (see the comment on walk_page_range() for more details) |
e6473092 MM |
1294 | */ |
1295 | struct mm_walk { | |
a00cc7d9 MW |
1296 | int (*pud_entry)(pud_t *pud, unsigned long addr, |
1297 | unsigned long next, struct mm_walk *walk); | |
0f157a5b AM |
1298 | int (*pmd_entry)(pmd_t *pmd, unsigned long addr, |
1299 | unsigned long next, struct mm_walk *walk); | |
1300 | int (*pte_entry)(pte_t *pte, unsigned long addr, | |
1301 | unsigned long next, struct mm_walk *walk); | |
1302 | int (*pte_hole)(unsigned long addr, unsigned long next, | |
1303 | struct mm_walk *walk); | |
1304 | int (*hugetlb_entry)(pte_t *pte, unsigned long hmask, | |
1305 | unsigned long addr, unsigned long next, | |
1306 | struct mm_walk *walk); | |
fafaa426 NH |
1307 | int (*test_walk)(unsigned long addr, unsigned long next, |
1308 | struct mm_walk *walk); | |
2165009b | 1309 | struct mm_struct *mm; |
fafaa426 | 1310 | struct vm_area_struct *vma; |
2165009b | 1311 | void *private; |
e6473092 MM |
1312 | }; |
1313 | ||
2165009b DH |
1314 | int walk_page_range(unsigned long addr, unsigned long end, |
1315 | struct mm_walk *walk); | |
900fc5f1 | 1316 | int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk); |
42b77728 | 1317 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
3bf5ee95 | 1318 | unsigned long end, unsigned long floor, unsigned long ceiling); |
1da177e4 LT |
1319 | int copy_page_range(struct mm_struct *dst, struct mm_struct *src, |
1320 | struct vm_area_struct *vma); | |
1da177e4 LT |
1321 | void unmap_mapping_range(struct address_space *mapping, |
1322 | loff_t const holebegin, loff_t const holelen, int even_cows); | |
09796395 | 1323 | int follow_pte_pmd(struct mm_struct *mm, unsigned long address, |
a4d1a885 | 1324 | unsigned long *start, unsigned long *end, |
09796395 | 1325 | pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp); |
3b6748e2 JW |
1326 | int follow_pfn(struct vm_area_struct *vma, unsigned long address, |
1327 | unsigned long *pfn); | |
d87fe660 | 1328 | int follow_phys(struct vm_area_struct *vma, unsigned long address, |
1329 | unsigned int flags, unsigned long *prot, resource_size_t *phys); | |
28b2ee20 RR |
1330 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
1331 | void *buf, int len, int write); | |
1da177e4 LT |
1332 | |
1333 | static inline void unmap_shared_mapping_range(struct address_space *mapping, | |
1334 | loff_t const holebegin, loff_t const holelen) | |
1335 | { | |
1336 | unmap_mapping_range(mapping, holebegin, holelen, 0); | |
1337 | } | |
1338 | ||
7caef267 | 1339 | extern void truncate_pagecache(struct inode *inode, loff_t new); |
2c27c65e | 1340 | extern void truncate_setsize(struct inode *inode, loff_t newsize); |
90a80202 | 1341 | void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to); |
623e3db9 | 1342 | void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end); |
750b4987 | 1343 | int truncate_inode_page(struct address_space *mapping, struct page *page); |
25718736 | 1344 | int generic_error_remove_page(struct address_space *mapping, struct page *page); |
83f78668 WF |
1345 | int invalidate_inode_page(struct page *page); |
1346 | ||
7ee1dd3f | 1347 | #ifdef CONFIG_MMU |
dcddffd4 KS |
1348 | extern int handle_mm_fault(struct vm_area_struct *vma, unsigned long address, |
1349 | unsigned int flags); | |
5c723ba5 | 1350 | extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, |
4a9e1cda DD |
1351 | unsigned long address, unsigned int fault_flags, |
1352 | bool *unlocked); | |
7ee1dd3f | 1353 | #else |
dcddffd4 KS |
1354 | static inline int handle_mm_fault(struct vm_area_struct *vma, |
1355 | unsigned long address, unsigned int flags) | |
7ee1dd3f DH |
1356 | { |
1357 | /* should never happen if there's no MMU */ | |
1358 | BUG(); | |
1359 | return VM_FAULT_SIGBUS; | |
1360 | } | |
5c723ba5 PZ |
1361 | static inline int fixup_user_fault(struct task_struct *tsk, |
1362 | struct mm_struct *mm, unsigned long address, | |
4a9e1cda | 1363 | unsigned int fault_flags, bool *unlocked) |
5c723ba5 PZ |
1364 | { |
1365 | /* should never happen if there's no MMU */ | |
1366 | BUG(); | |
1367 | return -EFAULT; | |
1368 | } | |
7ee1dd3f | 1369 | #endif |
f33ea7f4 | 1370 | |
c088e31d SF |
1371 | extern void vma_do_file_update_time(struct vm_area_struct *, const char[], int); |
1372 | extern struct file *vma_do_pr_or_file(struct vm_area_struct *, const char[], | |
1373 | int); | |
1374 | extern void vma_do_get_file(struct vm_area_struct *, const char[], int); | |
1375 | extern void vma_do_fput(struct vm_area_struct *, const char[], int); | |
1376 | ||
1377 | #define vma_file_update_time(vma) vma_do_file_update_time(vma, __func__, \ | |
1378 | __LINE__) | |
1379 | #define vma_pr_or_file(vma) vma_do_pr_or_file(vma, __func__, \ | |
1380 | __LINE__) | |
1381 | #define vma_get_file(vma) vma_do_get_file(vma, __func__, __LINE__) | |
1382 | #define vma_fput(vma) vma_do_fput(vma, __func__, __LINE__) | |
1383 | ||
1384 | #ifndef CONFIG_MMU | |
1385 | extern struct file *vmr_do_pr_or_file(struct vm_region *, const char[], int); | |
1386 | extern void vmr_do_fput(struct vm_region *, const char[], int); | |
1387 | ||
1388 | #define vmr_pr_or_file(region) vmr_do_pr_or_file(region, __func__, \ | |
1389 | __LINE__) | |
1390 | #define vmr_fput(region) vmr_do_fput(region, __func__, __LINE__) | |
1391 | #endif /* !CONFIG_MMU */ | |
1392 | ||
f307ab6d LS |
1393 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, |
1394 | unsigned int gup_flags); | |
5ddd36b9 | 1395 | extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
6347e8d5 | 1396 | void *buf, int len, unsigned int gup_flags); |
84d77d3f EB |
1397 | extern int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, |
1398 | unsigned long addr, void *buf, int len, unsigned int gup_flags); | |
1da177e4 | 1399 | |
1e987790 DH |
1400 | long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm, |
1401 | unsigned long start, unsigned long nr_pages, | |
9beae1ea | 1402 | unsigned int gup_flags, struct page **pages, |
5b56d49f | 1403 | struct vm_area_struct **vmas, int *locked); |
c12d2da5 | 1404 | long get_user_pages(unsigned long start, unsigned long nr_pages, |
768ae309 | 1405 | unsigned int gup_flags, struct page **pages, |
cde70140 | 1406 | struct vm_area_struct **vmas); |
c12d2da5 | 1407 | long get_user_pages_locked(unsigned long start, unsigned long nr_pages, |
3b913179 | 1408 | unsigned int gup_flags, struct page **pages, int *locked); |
c12d2da5 | 1409 | long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages, |
c164154f | 1410 | struct page **pages, unsigned int gup_flags); |
2bb6d283 DW |
1411 | #ifdef CONFIG_FS_DAX |
1412 | long get_user_pages_longterm(unsigned long start, unsigned long nr_pages, | |
1413 | unsigned int gup_flags, struct page **pages, | |
1414 | struct vm_area_struct **vmas); | |
1415 | #else | |
1416 | static inline long get_user_pages_longterm(unsigned long start, | |
1417 | unsigned long nr_pages, unsigned int gup_flags, | |
1418 | struct page **pages, struct vm_area_struct **vmas) | |
1419 | { | |
1420 | return get_user_pages(start, nr_pages, gup_flags, pages, vmas); | |
1421 | } | |
1422 | #endif /* CONFIG_FS_DAX */ | |
1423 | ||
d2bf6be8 NP |
1424 | int get_user_pages_fast(unsigned long start, int nr_pages, int write, |
1425 | struct page **pages); | |
8025e5dd JK |
1426 | |
1427 | /* Container for pinned pfns / pages */ | |
1428 | struct frame_vector { | |
1429 | unsigned int nr_allocated; /* Number of frames we have space for */ | |
1430 | unsigned int nr_frames; /* Number of frames stored in ptrs array */ | |
1431 | bool got_ref; /* Did we pin pages by getting page ref? */ | |
1432 | bool is_pfns; /* Does array contain pages or pfns? */ | |
1433 | void *ptrs[0]; /* Array of pinned pfns / pages. Use | |
1434 | * pfns_vector_pages() or pfns_vector_pfns() | |
1435 | * for access */ | |
1436 | }; | |
1437 | ||
1438 | struct frame_vector *frame_vector_create(unsigned int nr_frames); | |
1439 | void frame_vector_destroy(struct frame_vector *vec); | |
1440 | int get_vaddr_frames(unsigned long start, unsigned int nr_pfns, | |
7f23b350 | 1441 | unsigned int gup_flags, struct frame_vector *vec); |
8025e5dd JK |
1442 | void put_vaddr_frames(struct frame_vector *vec); |
1443 | int frame_vector_to_pages(struct frame_vector *vec); | |
1444 | void frame_vector_to_pfns(struct frame_vector *vec); | |
1445 | ||
1446 | static inline unsigned int frame_vector_count(struct frame_vector *vec) | |
1447 | { | |
1448 | return vec->nr_frames; | |
1449 | } | |
1450 | ||
1451 | static inline struct page **frame_vector_pages(struct frame_vector *vec) | |
1452 | { | |
1453 | if (vec->is_pfns) { | |
1454 | int err = frame_vector_to_pages(vec); | |
1455 | ||
1456 | if (err) | |
1457 | return ERR_PTR(err); | |
1458 | } | |
1459 | return (struct page **)(vec->ptrs); | |
1460 | } | |
1461 | ||
1462 | static inline unsigned long *frame_vector_pfns(struct frame_vector *vec) | |
1463 | { | |
1464 | if (!vec->is_pfns) | |
1465 | frame_vector_to_pfns(vec); | |
1466 | return (unsigned long *)(vec->ptrs); | |
1467 | } | |
1468 | ||
18022c5d MG |
1469 | struct kvec; |
1470 | int get_kernel_pages(const struct kvec *iov, int nr_pages, int write, | |
1471 | struct page **pages); | |
1472 | int get_kernel_page(unsigned long start, int write, struct page **pages); | |
f3e8fccd | 1473 | struct page *get_dump_page(unsigned long addr); |
1da177e4 | 1474 | |
cf9a2ae8 | 1475 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
d47992f8 LC |
1476 | extern void do_invalidatepage(struct page *page, unsigned int offset, |
1477 | unsigned int length); | |
cf9a2ae8 | 1478 | |
1da177e4 | 1479 | int __set_page_dirty_nobuffers(struct page *page); |
76719325 | 1480 | int __set_page_dirty_no_writeback(struct page *page); |
1da177e4 LT |
1481 | int redirty_page_for_writepage(struct writeback_control *wbc, |
1482 | struct page *page); | |
62cccb8c | 1483 | void account_page_dirtied(struct page *page, struct address_space *mapping); |
c4843a75 | 1484 | void account_page_cleaned(struct page *page, struct address_space *mapping, |
62cccb8c | 1485 | struct bdi_writeback *wb); |
b3c97528 | 1486 | int set_page_dirty(struct page *page); |
1da177e4 | 1487 | int set_page_dirty_lock(struct page *page); |
736304f3 JK |
1488 | void __cancel_dirty_page(struct page *page); |
1489 | static inline void cancel_dirty_page(struct page *page) | |
1490 | { | |
1491 | /* Avoid atomic ops, locking, etc. when not actually needed. */ | |
1492 | if (PageDirty(page)) | |
1493 | __cancel_dirty_page(page); | |
1494 | } | |
1da177e4 | 1495 | int clear_page_dirty_for_io(struct page *page); |
b9ea2515 | 1496 | |
a9090253 | 1497 | int get_cmdline(struct task_struct *task, char *buffer, int buflen); |
1da177e4 | 1498 | |
b5330628 ON |
1499 | static inline bool vma_is_anonymous(struct vm_area_struct *vma) |
1500 | { | |
1501 | return !vma->vm_ops; | |
1502 | } | |
1503 | ||
b0506e48 MR |
1504 | #ifdef CONFIG_SHMEM |
1505 | /* | |
1506 | * The vma_is_shmem is not inline because it is used only by slow | |
1507 | * paths in userfault. | |
1508 | */ | |
1509 | bool vma_is_shmem(struct vm_area_struct *vma); | |
1510 | #else | |
1511 | static inline bool vma_is_shmem(struct vm_area_struct *vma) { return false; } | |
1512 | #endif | |
1513 | ||
d17af505 | 1514 | int vma_is_stack_for_current(struct vm_area_struct *vma); |
b7643757 | 1515 | |
b6a2fea3 OW |
1516 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
1517 | unsigned long old_addr, struct vm_area_struct *new_vma, | |
38a76013 ML |
1518 | unsigned long new_addr, unsigned long len, |
1519 | bool need_rmap_locks); | |
7da4d641 PZ |
1520 | extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start, |
1521 | unsigned long end, pgprot_t newprot, | |
4b10e7d5 | 1522 | int dirty_accountable, int prot_numa); |
b6a2fea3 OW |
1523 | extern int mprotect_fixup(struct vm_area_struct *vma, |
1524 | struct vm_area_struct **pprev, unsigned long start, | |
1525 | unsigned long end, unsigned long newflags); | |
1da177e4 | 1526 | |
465a454f PZ |
1527 | /* |
1528 | * doesn't attempt to fault and will return short. | |
1529 | */ | |
1530 | int __get_user_pages_fast(unsigned long start, int nr_pages, int write, | |
1531 | struct page **pages); | |
d559db08 KH |
1532 | /* |
1533 | * per-process(per-mm_struct) statistics. | |
1534 | */ | |
d559db08 KH |
1535 | static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) |
1536 | { | |
69c97823 KK |
1537 | long val = atomic_long_read(&mm->rss_stat.count[member]); |
1538 | ||
1539 | #ifdef SPLIT_RSS_COUNTING | |
1540 | /* | |
1541 | * counter is updated in asynchronous manner and may go to minus. | |
1542 | * But it's never be expected number for users. | |
1543 | */ | |
1544 | if (val < 0) | |
1545 | val = 0; | |
172703b0 | 1546 | #endif |
69c97823 KK |
1547 | return (unsigned long)val; |
1548 | } | |
d559db08 KH |
1549 | |
1550 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) | |
1551 | { | |
172703b0 | 1552 | atomic_long_add(value, &mm->rss_stat.count[member]); |
d559db08 KH |
1553 | } |
1554 | ||
1555 | static inline void inc_mm_counter(struct mm_struct *mm, int member) | |
1556 | { | |
172703b0 | 1557 | atomic_long_inc(&mm->rss_stat.count[member]); |
d559db08 KH |
1558 | } |
1559 | ||
1560 | static inline void dec_mm_counter(struct mm_struct *mm, int member) | |
1561 | { | |
172703b0 | 1562 | atomic_long_dec(&mm->rss_stat.count[member]); |
d559db08 KH |
1563 | } |
1564 | ||
eca56ff9 JM |
1565 | /* Optimized variant when page is already known not to be PageAnon */ |
1566 | static inline int mm_counter_file(struct page *page) | |
1567 | { | |
1568 | if (PageSwapBacked(page)) | |
1569 | return MM_SHMEMPAGES; | |
1570 | return MM_FILEPAGES; | |
1571 | } | |
1572 | ||
1573 | static inline int mm_counter(struct page *page) | |
1574 | { | |
1575 | if (PageAnon(page)) | |
1576 | return MM_ANONPAGES; | |
1577 | return mm_counter_file(page); | |
1578 | } | |
1579 | ||
d559db08 KH |
1580 | static inline unsigned long get_mm_rss(struct mm_struct *mm) |
1581 | { | |
1582 | return get_mm_counter(mm, MM_FILEPAGES) + | |
eca56ff9 JM |
1583 | get_mm_counter(mm, MM_ANONPAGES) + |
1584 | get_mm_counter(mm, MM_SHMEMPAGES); | |
d559db08 KH |
1585 | } |
1586 | ||
1587 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) | |
1588 | { | |
1589 | return max(mm->hiwater_rss, get_mm_rss(mm)); | |
1590 | } | |
1591 | ||
1592 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) | |
1593 | { | |
1594 | return max(mm->hiwater_vm, mm->total_vm); | |
1595 | } | |
1596 | ||
1597 | static inline void update_hiwater_rss(struct mm_struct *mm) | |
1598 | { | |
1599 | unsigned long _rss = get_mm_rss(mm); | |
1600 | ||
1601 | if ((mm)->hiwater_rss < _rss) | |
1602 | (mm)->hiwater_rss = _rss; | |
1603 | } | |
1604 | ||
1605 | static inline void update_hiwater_vm(struct mm_struct *mm) | |
1606 | { | |
1607 | if (mm->hiwater_vm < mm->total_vm) | |
1608 | mm->hiwater_vm = mm->total_vm; | |
1609 | } | |
1610 | ||
695f0559 PC |
1611 | static inline void reset_mm_hiwater_rss(struct mm_struct *mm) |
1612 | { | |
1613 | mm->hiwater_rss = get_mm_rss(mm); | |
1614 | } | |
1615 | ||
d559db08 KH |
1616 | static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, |
1617 | struct mm_struct *mm) | |
1618 | { | |
1619 | unsigned long hiwater_rss = get_mm_hiwater_rss(mm); | |
1620 | ||
1621 | if (*maxrss < hiwater_rss) | |
1622 | *maxrss = hiwater_rss; | |
1623 | } | |
1624 | ||
53bddb4e | 1625 | #if defined(SPLIT_RSS_COUNTING) |
05af2e10 | 1626 | void sync_mm_rss(struct mm_struct *mm); |
53bddb4e | 1627 | #else |
05af2e10 | 1628 | static inline void sync_mm_rss(struct mm_struct *mm) |
53bddb4e KH |
1629 | { |
1630 | } | |
1631 | #endif | |
465a454f | 1632 | |
3565fce3 DW |
1633 | #ifndef __HAVE_ARCH_PTE_DEVMAP |
1634 | static inline int pte_devmap(pte_t pte) | |
1635 | { | |
1636 | return 0; | |
1637 | } | |
1638 | #endif | |
1639 | ||
6d2329f8 | 1640 | int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot); |
d08b3851 | 1641 | |
25ca1d6c NK |
1642 | extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr, |
1643 | spinlock_t **ptl); | |
1644 | static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, | |
1645 | spinlock_t **ptl) | |
1646 | { | |
1647 | pte_t *ptep; | |
1648 | __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl)); | |
1649 | return ptep; | |
1650 | } | |
c9cfcddf | 1651 | |
c2febafc KS |
1652 | #ifdef __PAGETABLE_P4D_FOLDED |
1653 | static inline int __p4d_alloc(struct mm_struct *mm, pgd_t *pgd, | |
1654 | unsigned long address) | |
1655 | { | |
1656 | return 0; | |
1657 | } | |
1658 | #else | |
1659 | int __p4d_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); | |
1660 | #endif | |
1661 | ||
b4e98d9a | 1662 | #if defined(__PAGETABLE_PUD_FOLDED) || !defined(CONFIG_MMU) |
c2febafc | 1663 | static inline int __pud_alloc(struct mm_struct *mm, p4d_t *p4d, |
5f22df00 NP |
1664 | unsigned long address) |
1665 | { | |
1666 | return 0; | |
1667 | } | |
b4e98d9a KS |
1668 | static inline void mm_inc_nr_puds(struct mm_struct *mm) {} |
1669 | static inline void mm_dec_nr_puds(struct mm_struct *mm) {} | |
1670 | ||
5f22df00 | 1671 | #else |
c2febafc | 1672 | int __pud_alloc(struct mm_struct *mm, p4d_t *p4d, unsigned long address); |
b4e98d9a | 1673 | |
b4e98d9a KS |
1674 | static inline void mm_inc_nr_puds(struct mm_struct *mm) |
1675 | { | |
fc708bc1 MS |
1676 | if (mm_pud_folded(mm)) |
1677 | return; | |
af5b0f6a | 1678 | atomic_long_add(PTRS_PER_PUD * sizeof(pud_t), &mm->pgtables_bytes); |
b4e98d9a KS |
1679 | } |
1680 | ||
1681 | static inline void mm_dec_nr_puds(struct mm_struct *mm) | |
1682 | { | |
fc708bc1 MS |
1683 | if (mm_pud_folded(mm)) |
1684 | return; | |
af5b0f6a | 1685 | atomic_long_sub(PTRS_PER_PUD * sizeof(pud_t), &mm->pgtables_bytes); |
b4e98d9a | 1686 | } |
5f22df00 NP |
1687 | #endif |
1688 | ||
2d2f5119 | 1689 | #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU) |
5f22df00 NP |
1690 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, |
1691 | unsigned long address) | |
1692 | { | |
1693 | return 0; | |
1694 | } | |
dc6c9a35 | 1695 | |
dc6c9a35 KS |
1696 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) {} |
1697 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) {} | |
1698 | ||
5f22df00 | 1699 | #else |
1bb3630e | 1700 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
dc6c9a35 | 1701 | |
dc6c9a35 KS |
1702 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) |
1703 | { | |
fc708bc1 MS |
1704 | if (mm_pmd_folded(mm)) |
1705 | return; | |
af5b0f6a | 1706 | atomic_long_add(PTRS_PER_PMD * sizeof(pmd_t), &mm->pgtables_bytes); |
dc6c9a35 KS |
1707 | } |
1708 | ||
1709 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) | |
1710 | { | |
fc708bc1 MS |
1711 | if (mm_pmd_folded(mm)) |
1712 | return; | |
af5b0f6a | 1713 | atomic_long_sub(PTRS_PER_PMD * sizeof(pmd_t), &mm->pgtables_bytes); |
dc6c9a35 | 1714 | } |
5f22df00 NP |
1715 | #endif |
1716 | ||
c4812909 | 1717 | #ifdef CONFIG_MMU |
af5b0f6a | 1718 | static inline void mm_pgtables_bytes_init(struct mm_struct *mm) |
c4812909 | 1719 | { |
af5b0f6a | 1720 | atomic_long_set(&mm->pgtables_bytes, 0); |
c4812909 KS |
1721 | } |
1722 | ||
af5b0f6a | 1723 | static inline unsigned long mm_pgtables_bytes(const struct mm_struct *mm) |
c4812909 | 1724 | { |
af5b0f6a | 1725 | return atomic_long_read(&mm->pgtables_bytes); |
c4812909 KS |
1726 | } |
1727 | ||
1728 | static inline void mm_inc_nr_ptes(struct mm_struct *mm) | |
1729 | { | |
af5b0f6a | 1730 | atomic_long_add(PTRS_PER_PTE * sizeof(pte_t), &mm->pgtables_bytes); |
c4812909 KS |
1731 | } |
1732 | ||
1733 | static inline void mm_dec_nr_ptes(struct mm_struct *mm) | |
1734 | { | |
af5b0f6a | 1735 | atomic_long_sub(PTRS_PER_PTE * sizeof(pte_t), &mm->pgtables_bytes); |
c4812909 KS |
1736 | } |
1737 | #else | |
c4812909 | 1738 | |
af5b0f6a KS |
1739 | static inline void mm_pgtables_bytes_init(struct mm_struct *mm) {} |
1740 | static inline unsigned long mm_pgtables_bytes(const struct mm_struct *mm) | |
c4812909 KS |
1741 | { |
1742 | return 0; | |
1743 | } | |
1744 | ||
1745 | static inline void mm_inc_nr_ptes(struct mm_struct *mm) {} | |
1746 | static inline void mm_dec_nr_ptes(struct mm_struct *mm) {} | |
1747 | #endif | |
1748 | ||
3ed3a4f0 | 1749 | int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address); |
1bb3630e HD |
1750 | int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); |
1751 | ||
1da177e4 LT |
1752 | /* |
1753 | * The following ifdef needed to get the 4level-fixup.h header to work. | |
1754 | * Remove it when 4level-fixup.h has been removed. | |
1755 | */ | |
1bb3630e | 1756 | #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) |
505a60e2 KS |
1757 | |
1758 | #ifndef __ARCH_HAS_5LEVEL_HACK | |
c2febafc KS |
1759 | static inline p4d_t *p4d_alloc(struct mm_struct *mm, pgd_t *pgd, |
1760 | unsigned long address) | |
1761 | { | |
1762 | return (unlikely(pgd_none(*pgd)) && __p4d_alloc(mm, pgd, address)) ? | |
1763 | NULL : p4d_offset(pgd, address); | |
1764 | } | |
1765 | ||
1766 | static inline pud_t *pud_alloc(struct mm_struct *mm, p4d_t *p4d, | |
1767 | unsigned long address) | |
1da177e4 | 1768 | { |
c2febafc KS |
1769 | return (unlikely(p4d_none(*p4d)) && __pud_alloc(mm, p4d, address)) ? |
1770 | NULL : pud_offset(p4d, address); | |
1da177e4 | 1771 | } |
505a60e2 | 1772 | #endif /* !__ARCH_HAS_5LEVEL_HACK */ |
1da177e4 LT |
1773 | |
1774 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) | |
1775 | { | |
1bb3630e HD |
1776 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
1777 | NULL: pmd_offset(pud, address); | |
1da177e4 | 1778 | } |
1bb3630e HD |
1779 | #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ |
1780 | ||
57c1ffce | 1781 | #if USE_SPLIT_PTE_PTLOCKS |
597d795a | 1782 | #if ALLOC_SPLIT_PTLOCKS |
b35f1819 | 1783 | void __init ptlock_cache_init(void); |
539edb58 PZ |
1784 | extern bool ptlock_alloc(struct page *page); |
1785 | extern void ptlock_free(struct page *page); | |
1786 | ||
1787 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
1788 | { | |
1789 | return page->ptl; | |
1790 | } | |
597d795a | 1791 | #else /* ALLOC_SPLIT_PTLOCKS */ |
b35f1819 KS |
1792 | static inline void ptlock_cache_init(void) |
1793 | { | |
1794 | } | |
1795 | ||
49076ec2 KS |
1796 | static inline bool ptlock_alloc(struct page *page) |
1797 | { | |
49076ec2 KS |
1798 | return true; |
1799 | } | |
539edb58 | 1800 | |
49076ec2 KS |
1801 | static inline void ptlock_free(struct page *page) |
1802 | { | |
49076ec2 KS |
1803 | } |
1804 | ||
1805 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
1806 | { | |
539edb58 | 1807 | return &page->ptl; |
49076ec2 | 1808 | } |
597d795a | 1809 | #endif /* ALLOC_SPLIT_PTLOCKS */ |
49076ec2 KS |
1810 | |
1811 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) | |
1812 | { | |
1813 | return ptlock_ptr(pmd_page(*pmd)); | |
1814 | } | |
1815 | ||
1816 | static inline bool ptlock_init(struct page *page) | |
1817 | { | |
1818 | /* | |
1819 | * prep_new_page() initialize page->private (and therefore page->ptl) | |
1820 | * with 0. Make sure nobody took it in use in between. | |
1821 | * | |
1822 | * It can happen if arch try to use slab for page table allocation: | |
1d798ca3 | 1823 | * slab code uses page->slab_cache, which share storage with page->ptl. |
49076ec2 | 1824 | */ |
309381fe | 1825 | VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page); |
49076ec2 KS |
1826 | if (!ptlock_alloc(page)) |
1827 | return false; | |
1828 | spin_lock_init(ptlock_ptr(page)); | |
1829 | return true; | |
1830 | } | |
1831 | ||
1832 | /* Reset page->mapping so free_pages_check won't complain. */ | |
1833 | static inline void pte_lock_deinit(struct page *page) | |
1834 | { | |
1835 | page->mapping = NULL; | |
1836 | ptlock_free(page); | |
1837 | } | |
1838 | ||
57c1ffce | 1839 | #else /* !USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 HD |
1840 | /* |
1841 | * We use mm->page_table_lock to guard all pagetable pages of the mm. | |
1842 | */ | |
49076ec2 KS |
1843 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1844 | { | |
1845 | return &mm->page_table_lock; | |
1846 | } | |
b35f1819 | 1847 | static inline void ptlock_cache_init(void) {} |
49076ec2 KS |
1848 | static inline bool ptlock_init(struct page *page) { return true; } |
1849 | static inline void pte_lock_deinit(struct page *page) {} | |
57c1ffce | 1850 | #endif /* USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 | 1851 | |
b35f1819 KS |
1852 | static inline void pgtable_init(void) |
1853 | { | |
1854 | ptlock_cache_init(); | |
1855 | pgtable_cache_init(); | |
1856 | } | |
1857 | ||
390f44e2 | 1858 | static inline bool pgtable_page_ctor(struct page *page) |
2f569afd | 1859 | { |
706874e9 VD |
1860 | if (!ptlock_init(page)) |
1861 | return false; | |
2f569afd | 1862 | inc_zone_page_state(page, NR_PAGETABLE); |
706874e9 | 1863 | return true; |
2f569afd MS |
1864 | } |
1865 | ||
1866 | static inline void pgtable_page_dtor(struct page *page) | |
1867 | { | |
1868 | pte_lock_deinit(page); | |
1869 | dec_zone_page_state(page, NR_PAGETABLE); | |
1870 | } | |
1871 | ||
c74df32c HD |
1872 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
1873 | ({ \ | |
4c21e2f2 | 1874 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
c74df32c HD |
1875 | pte_t *__pte = pte_offset_map(pmd, address); \ |
1876 | *(ptlp) = __ptl; \ | |
1877 | spin_lock(__ptl); \ | |
1878 | __pte; \ | |
1879 | }) | |
1880 | ||
1881 | #define pte_unmap_unlock(pte, ptl) do { \ | |
1882 | spin_unlock(ptl); \ | |
1883 | pte_unmap(pte); \ | |
1884 | } while (0) | |
1885 | ||
3ed3a4f0 KS |
1886 | #define pte_alloc(mm, pmd, address) \ |
1887 | (unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, pmd, address)) | |
1888 | ||
1889 | #define pte_alloc_map(mm, pmd, address) \ | |
1890 | (pte_alloc(mm, pmd, address) ? NULL : pte_offset_map(pmd, address)) | |
1bb3630e | 1891 | |
c74df32c | 1892 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
3ed3a4f0 KS |
1893 | (pte_alloc(mm, pmd, address) ? \ |
1894 | NULL : pte_offset_map_lock(mm, pmd, address, ptlp)) | |
c74df32c | 1895 | |
1bb3630e | 1896 | #define pte_alloc_kernel(pmd, address) \ |
8ac1f832 | 1897 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ |
1bb3630e | 1898 | NULL: pte_offset_kernel(pmd, address)) |
1da177e4 | 1899 | |
e009bb30 KS |
1900 | #if USE_SPLIT_PMD_PTLOCKS |
1901 | ||
634391ac MS |
1902 | static struct page *pmd_to_page(pmd_t *pmd) |
1903 | { | |
1904 | unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1); | |
1905 | return virt_to_page((void *)((unsigned long) pmd & mask)); | |
1906 | } | |
1907 | ||
e009bb30 KS |
1908 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1909 | { | |
634391ac | 1910 | return ptlock_ptr(pmd_to_page(pmd)); |
e009bb30 KS |
1911 | } |
1912 | ||
1913 | static inline bool pgtable_pmd_page_ctor(struct page *page) | |
1914 | { | |
e009bb30 KS |
1915 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1916 | page->pmd_huge_pte = NULL; | |
1917 | #endif | |
49076ec2 | 1918 | return ptlock_init(page); |
e009bb30 KS |
1919 | } |
1920 | ||
1921 | static inline void pgtable_pmd_page_dtor(struct page *page) | |
1922 | { | |
1923 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
309381fe | 1924 | VM_BUG_ON_PAGE(page->pmd_huge_pte, page); |
e009bb30 | 1925 | #endif |
49076ec2 | 1926 | ptlock_free(page); |
e009bb30 KS |
1927 | } |
1928 | ||
634391ac | 1929 | #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte) |
e009bb30 KS |
1930 | |
1931 | #else | |
1932 | ||
9a86cb7b KS |
1933 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1934 | { | |
1935 | return &mm->page_table_lock; | |
1936 | } | |
1937 | ||
e009bb30 KS |
1938 | static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; } |
1939 | static inline void pgtable_pmd_page_dtor(struct page *page) {} | |
1940 | ||
c389a250 | 1941 | #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) |
9a86cb7b | 1942 | |
e009bb30 KS |
1943 | #endif |
1944 | ||
9a86cb7b KS |
1945 | static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) |
1946 | { | |
1947 | spinlock_t *ptl = pmd_lockptr(mm, pmd); | |
1948 | spin_lock(ptl); | |
1949 | return ptl; | |
1950 | } | |
1951 | ||
a00cc7d9 MW |
1952 | /* |
1953 | * No scalability reason to split PUD locks yet, but follow the same pattern | |
1954 | * as the PMD locks to make it easier if we decide to. The VM should not be | |
1955 | * considered ready to switch to split PUD locks yet; there may be places | |
1956 | * which need to be converted from page_table_lock. | |
1957 | */ | |
1958 | static inline spinlock_t *pud_lockptr(struct mm_struct *mm, pud_t *pud) | |
1959 | { | |
1960 | return &mm->page_table_lock; | |
1961 | } | |
1962 | ||
1963 | static inline spinlock_t *pud_lock(struct mm_struct *mm, pud_t *pud) | |
1964 | { | |
1965 | spinlock_t *ptl = pud_lockptr(mm, pud); | |
1966 | ||
1967 | spin_lock(ptl); | |
1968 | return ptl; | |
1969 | } | |
62906027 | 1970 | |
a00cc7d9 | 1971 | extern void __init pagecache_init(void); |
1da177e4 | 1972 | extern void free_area_init(unsigned long * zones_size); |
9109fb7b JW |
1973 | extern void free_area_init_node(int nid, unsigned long * zones_size, |
1974 | unsigned long zone_start_pfn, unsigned long *zholes_size); | |
49a7f04a DH |
1975 | extern void free_initmem(void); |
1976 | ||
69afade7 JL |
1977 | /* |
1978 | * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) | |
1979 | * into the buddy system. The freed pages will be poisoned with pattern | |
dbe67df4 | 1980 | * "poison" if it's within range [0, UCHAR_MAX]. |
69afade7 JL |
1981 | * Return pages freed into the buddy system. |
1982 | */ | |
11199692 | 1983 | extern unsigned long free_reserved_area(void *start, void *end, |
69afade7 | 1984 | int poison, char *s); |
c3d5f5f0 | 1985 | |
cfa11e08 JL |
1986 | #ifdef CONFIG_HIGHMEM |
1987 | /* | |
1988 | * Free a highmem page into the buddy system, adjusting totalhigh_pages | |
1989 | * and totalram_pages. | |
1990 | */ | |
1991 | extern void free_highmem_page(struct page *page); | |
1992 | #endif | |
69afade7 | 1993 | |
c3d5f5f0 | 1994 | extern void adjust_managed_page_count(struct page *page, long count); |
7ee3d4e8 | 1995 | extern void mem_init_print_info(const char *str); |
69afade7 | 1996 | |
4b50bcc7 | 1997 | extern void reserve_bootmem_region(phys_addr_t start, phys_addr_t end); |
92923ca3 | 1998 | |
69afade7 JL |
1999 | /* Free the reserved page into the buddy system, so it gets managed. */ |
2000 | static inline void __free_reserved_page(struct page *page) | |
2001 | { | |
2002 | ClearPageReserved(page); | |
2003 | init_page_count(page); | |
2004 | __free_page(page); | |
2005 | } | |
2006 | ||
2007 | static inline void free_reserved_page(struct page *page) | |
2008 | { | |
2009 | __free_reserved_page(page); | |
2010 | adjust_managed_page_count(page, 1); | |
2011 | } | |
2012 | ||
2013 | static inline void mark_page_reserved(struct page *page) | |
2014 | { | |
2015 | SetPageReserved(page); | |
2016 | adjust_managed_page_count(page, -1); | |
2017 | } | |
2018 | ||
2019 | /* | |
2020 | * Default method to free all the __init memory into the buddy system. | |
dbe67df4 JL |
2021 | * The freed pages will be poisoned with pattern "poison" if it's within |
2022 | * range [0, UCHAR_MAX]. | |
2023 | * Return pages freed into the buddy system. | |
69afade7 JL |
2024 | */ |
2025 | static inline unsigned long free_initmem_default(int poison) | |
2026 | { | |
2027 | extern char __init_begin[], __init_end[]; | |
2028 | ||
11199692 | 2029 | return free_reserved_area(&__init_begin, &__init_end, |
69afade7 JL |
2030 | poison, "unused kernel"); |
2031 | } | |
2032 | ||
7ee3d4e8 JL |
2033 | static inline unsigned long get_num_physpages(void) |
2034 | { | |
2035 | int nid; | |
2036 | unsigned long phys_pages = 0; | |
2037 | ||
2038 | for_each_online_node(nid) | |
2039 | phys_pages += node_present_pages(nid); | |
2040 | ||
2041 | return phys_pages; | |
2042 | } | |
2043 | ||
0ee332c1 | 2044 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
c713216d | 2045 | /* |
0ee332c1 | 2046 | * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its |
c713216d MG |
2047 | * zones, allocate the backing mem_map and account for memory holes in a more |
2048 | * architecture independent manner. This is a substitute for creating the | |
2049 | * zone_sizes[] and zholes_size[] arrays and passing them to | |
2050 | * free_area_init_node() | |
2051 | * | |
2052 | * An architecture is expected to register range of page frames backed by | |
0ee332c1 | 2053 | * physical memory with memblock_add[_node]() before calling |
c713216d MG |
2054 | * free_area_init_nodes() passing in the PFN each zone ends at. At a basic |
2055 | * usage, an architecture is expected to do something like | |
2056 | * | |
2057 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, | |
2058 | * max_highmem_pfn}; | |
2059 | * for_each_valid_physical_page_range() | |
0ee332c1 | 2060 | * memblock_add_node(base, size, nid) |
c713216d MG |
2061 | * free_area_init_nodes(max_zone_pfns); |
2062 | * | |
0ee332c1 TH |
2063 | * free_bootmem_with_active_regions() calls free_bootmem_node() for each |
2064 | * registered physical page range. Similarly | |
2065 | * sparse_memory_present_with_active_regions() calls memory_present() for | |
2066 | * each range when SPARSEMEM is enabled. | |
c713216d MG |
2067 | * |
2068 | * See mm/page_alloc.c for more information on each function exposed by | |
0ee332c1 | 2069 | * CONFIG_HAVE_MEMBLOCK_NODE_MAP. |
c713216d MG |
2070 | */ |
2071 | extern void free_area_init_nodes(unsigned long *max_zone_pfn); | |
1e01979c | 2072 | unsigned long node_map_pfn_alignment(void); |
32996250 YL |
2073 | unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, |
2074 | unsigned long end_pfn); | |
c713216d MG |
2075 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
2076 | unsigned long end_pfn); | |
2077 | extern void get_pfn_range_for_nid(unsigned int nid, | |
2078 | unsigned long *start_pfn, unsigned long *end_pfn); | |
2079 | extern unsigned long find_min_pfn_with_active_regions(void); | |
c713216d MG |
2080 | extern void free_bootmem_with_active_regions(int nid, |
2081 | unsigned long max_low_pfn); | |
2082 | extern void sparse_memory_present_with_active_regions(int nid); | |
f2dbcfa7 | 2083 | |
0ee332c1 | 2084 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
f2dbcfa7 | 2085 | |
0ee332c1 | 2086 | #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \ |
f2dbcfa7 | 2087 | !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) |
8a942fde MG |
2088 | static inline int __early_pfn_to_nid(unsigned long pfn, |
2089 | struct mminit_pfnnid_cache *state) | |
f2dbcfa7 KH |
2090 | { |
2091 | return 0; | |
2092 | } | |
2093 | #else | |
2094 | /* please see mm/page_alloc.c */ | |
2095 | extern int __meminit early_pfn_to_nid(unsigned long pfn); | |
f2dbcfa7 | 2096 | /* there is a per-arch backend function. */ |
8a942fde MG |
2097 | extern int __meminit __early_pfn_to_nid(unsigned long pfn, |
2098 | struct mminit_pfnnid_cache *state); | |
f2dbcfa7 KH |
2099 | #endif |
2100 | ||
afa11cd3 | 2101 | #if defined(CONFIG_HAVE_MEMBLOCK) && !defined(CONFIG_FLAT_NODE_MEM_MAP) |
a4a3ede2 PT |
2102 | void zero_resv_unavail(void); |
2103 | #else | |
2104 | static inline void zero_resv_unavail(void) {} | |
2105 | #endif | |
2106 | ||
0e0b864e | 2107 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
a2f3aa02 DH |
2108 | extern void memmap_init_zone(unsigned long, int, unsigned long, |
2109 | unsigned long, enum memmap_context); | |
bc75d33f | 2110 | extern void setup_per_zone_wmarks(void); |
1b79acc9 | 2111 | extern int __meminit init_per_zone_wmark_min(void); |
1da177e4 | 2112 | extern void mem_init(void); |
8feae131 | 2113 | extern void __init mmap_init(void); |
9af744d7 | 2114 | extern void show_mem(unsigned int flags, nodemask_t *nodemask); |
d02bd27b | 2115 | extern long si_mem_available(void); |
1da177e4 LT |
2116 | extern void si_meminfo(struct sysinfo * val); |
2117 | extern void si_meminfo_node(struct sysinfo *val, int nid); | |
f6f34b43 SD |
2118 | #ifdef __HAVE_ARCH_RESERVED_KERNEL_PAGES |
2119 | extern unsigned long arch_reserved_kernel_pages(void); | |
2120 | #endif | |
1da177e4 | 2121 | |
a8e99259 MH |
2122 | extern __printf(3, 4) |
2123 | void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...); | |
a238ab5b | 2124 | |
e7c8d5c9 | 2125 | extern void setup_per_cpu_pageset(void); |
e7c8d5c9 | 2126 | |
112067f0 | 2127 | extern void zone_pcp_update(struct zone *zone); |
340175b7 | 2128 | extern void zone_pcp_reset(struct zone *zone); |
112067f0 | 2129 | |
75f7ad8e PS |
2130 | /* page_alloc.c */ |
2131 | extern int min_free_kbytes; | |
795ae7a0 | 2132 | extern int watermark_scale_factor; |
75f7ad8e | 2133 | |
8feae131 | 2134 | /* nommu.c */ |
33e5d769 | 2135 | extern atomic_long_t mmap_pages_allocated; |
7e660872 | 2136 | extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); |
8feae131 | 2137 | |
6b2dbba8 | 2138 | /* interval_tree.c */ |
6b2dbba8 | 2139 | void vma_interval_tree_insert(struct vm_area_struct *node, |
f808c13f | 2140 | struct rb_root_cached *root); |
9826a516 ML |
2141 | void vma_interval_tree_insert_after(struct vm_area_struct *node, |
2142 | struct vm_area_struct *prev, | |
f808c13f | 2143 | struct rb_root_cached *root); |
6b2dbba8 | 2144 | void vma_interval_tree_remove(struct vm_area_struct *node, |
f808c13f DB |
2145 | struct rb_root_cached *root); |
2146 | struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root_cached *root, | |
6b2dbba8 ML |
2147 | unsigned long start, unsigned long last); |
2148 | struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node, | |
2149 | unsigned long start, unsigned long last); | |
2150 | ||
2151 | #define vma_interval_tree_foreach(vma, root, start, last) \ | |
2152 | for (vma = vma_interval_tree_iter_first(root, start, last); \ | |
2153 | vma; vma = vma_interval_tree_iter_next(vma, start, last)) | |
1da177e4 | 2154 | |
bf181b9f | 2155 | void anon_vma_interval_tree_insert(struct anon_vma_chain *node, |
f808c13f | 2156 | struct rb_root_cached *root); |
bf181b9f | 2157 | void anon_vma_interval_tree_remove(struct anon_vma_chain *node, |
f808c13f DB |
2158 | struct rb_root_cached *root); |
2159 | struct anon_vma_chain * | |
2160 | anon_vma_interval_tree_iter_first(struct rb_root_cached *root, | |
2161 | unsigned long start, unsigned long last); | |
bf181b9f ML |
2162 | struct anon_vma_chain *anon_vma_interval_tree_iter_next( |
2163 | struct anon_vma_chain *node, unsigned long start, unsigned long last); | |
ed8ea815 ML |
2164 | #ifdef CONFIG_DEBUG_VM_RB |
2165 | void anon_vma_interval_tree_verify(struct anon_vma_chain *node); | |
2166 | #endif | |
bf181b9f ML |
2167 | |
2168 | #define anon_vma_interval_tree_foreach(avc, root, start, last) \ | |
2169 | for (avc = anon_vma_interval_tree_iter_first(root, start, last); \ | |
2170 | avc; avc = anon_vma_interval_tree_iter_next(avc, start, last)) | |
2171 | ||
1da177e4 | 2172 | /* mmap.c */ |
34b4e4aa | 2173 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
e86f15ee AA |
2174 | extern int __vma_adjust(struct vm_area_struct *vma, unsigned long start, |
2175 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert, | |
2176 | struct vm_area_struct *expand); | |
2177 | static inline int vma_adjust(struct vm_area_struct *vma, unsigned long start, | |
2178 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert) | |
2179 | { | |
2180 | return __vma_adjust(vma, start, end, pgoff, insert, NULL); | |
2181 | } | |
1da177e4 LT |
2182 | extern struct vm_area_struct *vma_merge(struct mm_struct *, |
2183 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, | |
2184 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, | |
19a809af | 2185 | struct mempolicy *, struct vm_userfaultfd_ctx); |
1da177e4 | 2186 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); |
def5efe0 DR |
2187 | extern int __split_vma(struct mm_struct *, struct vm_area_struct *, |
2188 | unsigned long addr, int new_below); | |
2189 | extern int split_vma(struct mm_struct *, struct vm_area_struct *, | |
2190 | unsigned long addr, int new_below); | |
1da177e4 LT |
2191 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); |
2192 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, | |
2193 | struct rb_node **, struct rb_node *); | |
a8fb5618 | 2194 | extern void unlink_file_vma(struct vm_area_struct *); |
1da177e4 | 2195 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
38a76013 ML |
2196 | unsigned long addr, unsigned long len, pgoff_t pgoff, |
2197 | bool *need_rmap_locks); | |
1da177e4 | 2198 | extern void exit_mmap(struct mm_struct *); |
925d1c40 | 2199 | |
9c599024 CG |
2200 | static inline int check_data_rlimit(unsigned long rlim, |
2201 | unsigned long new, | |
2202 | unsigned long start, | |
2203 | unsigned long end_data, | |
2204 | unsigned long start_data) | |
2205 | { | |
2206 | if (rlim < RLIM_INFINITY) { | |
2207 | if (((new - start) + (end_data - start_data)) > rlim) | |
2208 | return -ENOSPC; | |
2209 | } | |
2210 | ||
2211 | return 0; | |
2212 | } | |
2213 | ||
7906d00c AA |
2214 | extern int mm_take_all_locks(struct mm_struct *mm); |
2215 | extern void mm_drop_all_locks(struct mm_struct *mm); | |
2216 | ||
38646013 JS |
2217 | extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
2218 | extern struct file *get_mm_exe_file(struct mm_struct *mm); | |
cd81a917 | 2219 | extern struct file *get_task_exe_file(struct task_struct *task); |
925d1c40 | 2220 | |
84638335 KK |
2221 | extern bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long npages); |
2222 | extern void vm_stat_account(struct mm_struct *, vm_flags_t, long npages); | |
2223 | ||
2eefd878 DS |
2224 | extern bool vma_is_special_mapping(const struct vm_area_struct *vma, |
2225 | const struct vm_special_mapping *sm); | |
3935ed6a SS |
2226 | extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm, |
2227 | unsigned long addr, unsigned long len, | |
a62c34bd AL |
2228 | unsigned long flags, |
2229 | const struct vm_special_mapping *spec); | |
2230 | /* This is an obsolete alternative to _install_special_mapping. */ | |
fa5dc22f RM |
2231 | extern int install_special_mapping(struct mm_struct *mm, |
2232 | unsigned long addr, unsigned long len, | |
2233 | unsigned long flags, struct page **pages); | |
1da177e4 LT |
2234 | |
2235 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
2236 | ||
0165ab44 | 2237 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
897ab3e0 MR |
2238 | unsigned long len, vm_flags_t vm_flags, unsigned long pgoff, |
2239 | struct list_head *uf); | |
1fcfd8db | 2240 | extern unsigned long do_mmap(struct file *file, unsigned long addr, |
bebeb3d6 | 2241 | unsigned long len, unsigned long prot, unsigned long flags, |
897ab3e0 MR |
2242 | vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate, |
2243 | struct list_head *uf); | |
2244 | extern int do_munmap(struct mm_struct *, unsigned long, size_t, | |
2245 | struct list_head *uf); | |
1da177e4 | 2246 | |
1fcfd8db ON |
2247 | static inline unsigned long |
2248 | do_mmap_pgoff(struct file *file, unsigned long addr, | |
2249 | unsigned long len, unsigned long prot, unsigned long flags, | |
897ab3e0 MR |
2250 | unsigned long pgoff, unsigned long *populate, |
2251 | struct list_head *uf) | |
1fcfd8db | 2252 | { |
897ab3e0 | 2253 | return do_mmap(file, addr, len, prot, flags, 0, pgoff, populate, uf); |
1fcfd8db ON |
2254 | } |
2255 | ||
bebeb3d6 ML |
2256 | #ifdef CONFIG_MMU |
2257 | extern int __mm_populate(unsigned long addr, unsigned long len, | |
2258 | int ignore_errors); | |
2259 | static inline void mm_populate(unsigned long addr, unsigned long len) | |
2260 | { | |
2261 | /* Ignore errors */ | |
2262 | (void) __mm_populate(addr, len, 1); | |
2263 | } | |
2264 | #else | |
2265 | static inline void mm_populate(unsigned long addr, unsigned long len) {} | |
2266 | #endif | |
2267 | ||
e4eb1ff6 | 2268 | /* These take the mm semaphore themselves */ |
5d22fc25 | 2269 | extern int __must_check vm_brk(unsigned long, unsigned long); |
16e72e9b | 2270 | extern int __must_check vm_brk_flags(unsigned long, unsigned long, unsigned long); |
bfce281c | 2271 | extern int vm_munmap(unsigned long, size_t); |
9fbeb5ab | 2272 | extern unsigned long __must_check vm_mmap(struct file *, unsigned long, |
6be5ceb0 LT |
2273 | unsigned long, unsigned long, |
2274 | unsigned long, unsigned long); | |
1da177e4 | 2275 | |
db4fbfb9 ML |
2276 | struct vm_unmapped_area_info { |
2277 | #define VM_UNMAPPED_AREA_TOPDOWN 1 | |
2278 | unsigned long flags; | |
2279 | unsigned long length; | |
2280 | unsigned long low_limit; | |
2281 | unsigned long high_limit; | |
2282 | unsigned long align_mask; | |
2283 | unsigned long align_offset; | |
2284 | }; | |
2285 | ||
2286 | extern unsigned long unmapped_area(struct vm_unmapped_area_info *info); | |
2287 | extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info); | |
2288 | ||
2289 | /* | |
2290 | * Search for an unmapped address range. | |
2291 | * | |
2292 | * We are looking for a range that: | |
2293 | * - does not intersect with any VMA; | |
2294 | * - is contained within the [low_limit, high_limit) interval; | |
2295 | * - is at least the desired size. | |
2296 | * - satisfies (begin_addr & align_mask) == (align_offset & align_mask) | |
2297 | */ | |
2298 | static inline unsigned long | |
2299 | vm_unmapped_area(struct vm_unmapped_area_info *info) | |
2300 | { | |
cdd7875e | 2301 | if (info->flags & VM_UNMAPPED_AREA_TOPDOWN) |
db4fbfb9 | 2302 | return unmapped_area_topdown(info); |
cdd7875e BP |
2303 | else |
2304 | return unmapped_area(info); | |
db4fbfb9 ML |
2305 | } |
2306 | ||
85821aab | 2307 | /* truncate.c */ |
1da177e4 | 2308 | extern void truncate_inode_pages(struct address_space *, loff_t); |
d7339071 HR |
2309 | extern void truncate_inode_pages_range(struct address_space *, |
2310 | loff_t lstart, loff_t lend); | |
91b0abe3 | 2311 | extern void truncate_inode_pages_final(struct address_space *); |
1da177e4 LT |
2312 | |
2313 | /* generic vm_area_ops exported for stackable file systems */ | |
11bac800 | 2314 | extern int filemap_fault(struct vm_fault *vmf); |
82b0f8c3 | 2315 | extern void filemap_map_pages(struct vm_fault *vmf, |
bae473a4 | 2316 | pgoff_t start_pgoff, pgoff_t end_pgoff); |
11bac800 | 2317 | extern int filemap_page_mkwrite(struct vm_fault *vmf); |
1da177e4 LT |
2318 | |
2319 | /* mm/page-writeback.c */ | |
2b69c828 | 2320 | int __must_check write_one_page(struct page *page); |
1cf6e7d8 | 2321 | void task_dirty_inc(struct task_struct *tsk); |
1da177e4 LT |
2322 | |
2323 | /* readahead.c */ | |
2324 | #define VM_MAX_READAHEAD 128 /* kbytes */ | |
2325 | #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ | |
1da177e4 | 2326 | |
1da177e4 | 2327 | int force_page_cache_readahead(struct address_space *mapping, struct file *filp, |
7361f4d8 | 2328 | pgoff_t offset, unsigned long nr_to_read); |
cf914a7d RR |
2329 | |
2330 | void page_cache_sync_readahead(struct address_space *mapping, | |
2331 | struct file_ra_state *ra, | |
2332 | struct file *filp, | |
2333 | pgoff_t offset, | |
2334 | unsigned long size); | |
2335 | ||
2336 | void page_cache_async_readahead(struct address_space *mapping, | |
2337 | struct file_ra_state *ra, | |
2338 | struct file *filp, | |
2339 | struct page *pg, | |
2340 | pgoff_t offset, | |
2341 | unsigned long size); | |
2342 | ||
1be7107f | 2343 | extern unsigned long stack_guard_gap; |
d05f3169 | 2344 | /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ |
46dea3d0 | 2345 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
d05f3169 MH |
2346 | |
2347 | /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */ | |
2348 | extern int expand_downwards(struct vm_area_struct *vma, | |
2349 | unsigned long address); | |
8ca3eb08 | 2350 | #if VM_GROWSUP |
46dea3d0 | 2351 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
8ca3eb08 | 2352 | #else |
fee7e49d | 2353 | #define expand_upwards(vma, address) (0) |
9ab88515 | 2354 | #endif |
1da177e4 LT |
2355 | |
2356 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ | |
2357 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); | |
2358 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, | |
2359 | struct vm_area_struct **pprev); | |
2360 | ||
2361 | /* Look up the first VMA which intersects the interval start_addr..end_addr-1, | |
2362 | NULL if none. Assume start_addr < end_addr. */ | |
2363 | static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) | |
2364 | { | |
2365 | struct vm_area_struct * vma = find_vma(mm,start_addr); | |
2366 | ||
2367 | if (vma && end_addr <= vma->vm_start) | |
2368 | vma = NULL; | |
2369 | return vma; | |
2370 | } | |
2371 | ||
1be7107f HD |
2372 | static inline unsigned long vm_start_gap(struct vm_area_struct *vma) |
2373 | { | |
2374 | unsigned long vm_start = vma->vm_start; | |
2375 | ||
2376 | if (vma->vm_flags & VM_GROWSDOWN) { | |
2377 | vm_start -= stack_guard_gap; | |
2378 | if (vm_start > vma->vm_start) | |
2379 | vm_start = 0; | |
2380 | } | |
2381 | return vm_start; | |
2382 | } | |
2383 | ||
2384 | static inline unsigned long vm_end_gap(struct vm_area_struct *vma) | |
2385 | { | |
2386 | unsigned long vm_end = vma->vm_end; | |
2387 | ||
2388 | if (vma->vm_flags & VM_GROWSUP) { | |
2389 | vm_end += stack_guard_gap; | |
2390 | if (vm_end < vma->vm_end) | |
2391 | vm_end = -PAGE_SIZE; | |
2392 | } | |
2393 | return vm_end; | |
2394 | } | |
2395 | ||
1da177e4 LT |
2396 | static inline unsigned long vma_pages(struct vm_area_struct *vma) |
2397 | { | |
2398 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
2399 | } | |
2400 | ||
640708a2 PE |
2401 | /* Look up the first VMA which exactly match the interval vm_start ... vm_end */ |
2402 | static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, | |
2403 | unsigned long vm_start, unsigned long vm_end) | |
2404 | { | |
2405 | struct vm_area_struct *vma = find_vma(mm, vm_start); | |
2406 | ||
2407 | if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end)) | |
2408 | vma = NULL; | |
2409 | ||
2410 | return vma; | |
2411 | } | |
2412 | ||
162aed49 MK |
2413 | static inline bool range_in_vma(struct vm_area_struct *vma, |
2414 | unsigned long start, unsigned long end) | |
2415 | { | |
2416 | return (vma && vma->vm_start <= start && end <= vma->vm_end); | |
2417 | } | |
2418 | ||
bad849b3 | 2419 | #ifdef CONFIG_MMU |
804af2cf | 2420 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
64e45507 | 2421 | void vma_set_page_prot(struct vm_area_struct *vma); |
bad849b3 DH |
2422 | #else |
2423 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) | |
2424 | { | |
2425 | return __pgprot(0); | |
2426 | } | |
64e45507 PF |
2427 | static inline void vma_set_page_prot(struct vm_area_struct *vma) |
2428 | { | |
2429 | vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); | |
2430 | } | |
bad849b3 DH |
2431 | #endif |
2432 | ||
5877231f | 2433 | #ifdef CONFIG_NUMA_BALANCING |
4b10e7d5 | 2434 | unsigned long change_prot_numa(struct vm_area_struct *vma, |
b24f53a0 LS |
2435 | unsigned long start, unsigned long end); |
2436 | #endif | |
2437 | ||
deceb6cd | 2438 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
deceb6cd HD |
2439 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
2440 | unsigned long pfn, unsigned long size, pgprot_t); | |
a145dd41 | 2441 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
e0dc0d8f NP |
2442 | int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
2443 | unsigned long pfn); | |
1745cbc5 AL |
2444 | int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr, |
2445 | unsigned long pfn, pgprot_t pgprot); | |
423bad60 | 2446 | int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
01c8f1c4 | 2447 | pfn_t pfn); |
b2770da6 RZ |
2448 | int vm_insert_mixed_mkwrite(struct vm_area_struct *vma, unsigned long addr, |
2449 | pfn_t pfn); | |
b4cbb197 LT |
2450 | int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len); |
2451 | ||
deceb6cd | 2452 | |
240aadee ML |
2453 | struct page *follow_page_mask(struct vm_area_struct *vma, |
2454 | unsigned long address, unsigned int foll_flags, | |
2455 | unsigned int *page_mask); | |
2456 | ||
2457 | static inline struct page *follow_page(struct vm_area_struct *vma, | |
2458 | unsigned long address, unsigned int foll_flags) | |
2459 | { | |
2460 | unsigned int unused_page_mask; | |
2461 | return follow_page_mask(vma, address, foll_flags, &unused_page_mask); | |
2462 | } | |
2463 | ||
deceb6cd HD |
2464 | #define FOLL_WRITE 0x01 /* check pte is writable */ |
2465 | #define FOLL_TOUCH 0x02 /* mark page accessed */ | |
2466 | #define FOLL_GET 0x04 /* do get_page on page */ | |
8e4b9a60 | 2467 | #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ |
58fa879e | 2468 | #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ |
318b275f GN |
2469 | #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO |
2470 | * and return without waiting upon it */ | |
84d33df2 | 2471 | #define FOLL_POPULATE 0x40 /* fault in page */ |
500d65d4 | 2472 | #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */ |
69ebb83e | 2473 | #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */ |
0b9d7052 | 2474 | #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */ |
5117b3b8 | 2475 | #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */ |
234b239b | 2476 | #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */ |
de60f5f1 | 2477 | #define FOLL_MLOCK 0x1000 /* lock present pages */ |
1e987790 | 2478 | #define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */ |
19be0eaf | 2479 | #define FOLL_COW 0x4000 /* internal GUP flag */ |
4cc2a00a | 2480 | #define FOLL_ANON 0x8000 /* don't do file mappings */ |
1da177e4 | 2481 | |
9a291a7c JM |
2482 | static inline int vm_fault_to_errno(int vm_fault, int foll_flags) |
2483 | { | |
2484 | if (vm_fault & VM_FAULT_OOM) | |
2485 | return -ENOMEM; | |
2486 | if (vm_fault & (VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE)) | |
2487 | return (foll_flags & FOLL_HWPOISON) ? -EHWPOISON : -EFAULT; | |
2488 | if (vm_fault & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) | |
2489 | return -EFAULT; | |
2490 | return 0; | |
2491 | } | |
2492 | ||
2f569afd | 2493 | typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, |
aee16b3c JF |
2494 | void *data); |
2495 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, | |
2496 | unsigned long size, pte_fn_t fn, void *data); | |
2497 | ||
1da177e4 | 2498 | |
8823b1db LA |
2499 | #ifdef CONFIG_PAGE_POISONING |
2500 | extern bool page_poisoning_enabled(void); | |
2501 | extern void kernel_poison_pages(struct page *page, int numpages, int enable); | |
1414c7f4 | 2502 | extern bool page_is_poisoned(struct page *page); |
8823b1db LA |
2503 | #else |
2504 | static inline bool page_poisoning_enabled(void) { return false; } | |
2505 | static inline void kernel_poison_pages(struct page *page, int numpages, | |
2506 | int enable) { } | |
1414c7f4 | 2507 | static inline bool page_is_poisoned(struct page *page) { return false; } |
8823b1db LA |
2508 | #endif |
2509 | ||
12d6f21e | 2510 | #ifdef CONFIG_DEBUG_PAGEALLOC |
031bc574 JK |
2511 | extern bool _debug_pagealloc_enabled; |
2512 | extern void __kernel_map_pages(struct page *page, int numpages, int enable); | |
2513 | ||
2514 | static inline bool debug_pagealloc_enabled(void) | |
2515 | { | |
2516 | return _debug_pagealloc_enabled; | |
2517 | } | |
2518 | ||
2519 | static inline void | |
2520 | kernel_map_pages(struct page *page, int numpages, int enable) | |
2521 | { | |
2522 | if (!debug_pagealloc_enabled()) | |
2523 | return; | |
2524 | ||
2525 | __kernel_map_pages(page, numpages, enable); | |
2526 | } | |
8a235efa RW |
2527 | #ifdef CONFIG_HIBERNATION |
2528 | extern bool kernel_page_present(struct page *page); | |
40b44137 JK |
2529 | #endif /* CONFIG_HIBERNATION */ |
2530 | #else /* CONFIG_DEBUG_PAGEALLOC */ | |
1da177e4 | 2531 | static inline void |
9858db50 | 2532 | kernel_map_pages(struct page *page, int numpages, int enable) {} |
8a235efa RW |
2533 | #ifdef CONFIG_HIBERNATION |
2534 | static inline bool kernel_page_present(struct page *page) { return true; } | |
40b44137 JK |
2535 | #endif /* CONFIG_HIBERNATION */ |
2536 | static inline bool debug_pagealloc_enabled(void) | |
2537 | { | |
2538 | return false; | |
2539 | } | |
2540 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
1da177e4 | 2541 | |
a6c19dfe | 2542 | #ifdef __HAVE_ARCH_GATE_AREA |
31db58b3 | 2543 | extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); |
a6c19dfe AL |
2544 | extern int in_gate_area_no_mm(unsigned long addr); |
2545 | extern int in_gate_area(struct mm_struct *mm, unsigned long addr); | |
1da177e4 | 2546 | #else |
a6c19dfe AL |
2547 | static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
2548 | { | |
2549 | return NULL; | |
2550 | } | |
2551 | static inline int in_gate_area_no_mm(unsigned long addr) { return 0; } | |
2552 | static inline int in_gate_area(struct mm_struct *mm, unsigned long addr) | |
2553 | { | |
2554 | return 0; | |
2555 | } | |
1da177e4 LT |
2556 | #endif /* __HAVE_ARCH_GATE_AREA */ |
2557 | ||
44a70ade MH |
2558 | extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm); |
2559 | ||
146732ce JT |
2560 | #ifdef CONFIG_SYSCTL |
2561 | extern int sysctl_drop_caches; | |
8d65af78 | 2562 | int drop_caches_sysctl_handler(struct ctl_table *, int, |
9d0243bc | 2563 | void __user *, size_t *, loff_t *); |
146732ce JT |
2564 | #endif |
2565 | ||
cb731d6c VD |
2566 | void drop_slab(void); |
2567 | void drop_slab_node(int nid); | |
9d0243bc | 2568 | |
7a9166e3 LY |
2569 | #ifndef CONFIG_MMU |
2570 | #define randomize_va_space 0 | |
2571 | #else | |
a62eaf15 | 2572 | extern int randomize_va_space; |
7a9166e3 | 2573 | #endif |
a62eaf15 | 2574 | |
045e72ac | 2575 | const char * arch_vma_name(struct vm_area_struct *vma); |
03252919 | 2576 | void print_vma_addr(char *prefix, unsigned long rip); |
e6e5494c | 2577 | |
9bdac914 YL |
2578 | void sparse_mem_maps_populate_node(struct page **map_map, |
2579 | unsigned long pnum_begin, | |
2580 | unsigned long pnum_end, | |
2581 | unsigned long map_count, | |
2582 | int nodeid); | |
2583 | ||
98f3cfc1 | 2584 | struct page *sparse_mem_map_populate(unsigned long pnum, int nid); |
29c71111 | 2585 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
c2febafc KS |
2586 | p4d_t *vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node); |
2587 | pud_t *vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node); | |
29c71111 AW |
2588 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); |
2589 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node); | |
8f6aac41 | 2590 | void *vmemmap_alloc_block(unsigned long size, int node); |
4b94ffdc DW |
2591 | struct vmem_altmap; |
2592 | void *__vmemmap_alloc_block_buf(unsigned long size, int node, | |
2593 | struct vmem_altmap *altmap); | |
2594 | static inline void *vmemmap_alloc_block_buf(unsigned long size, int node) | |
2595 | { | |
2596 | return __vmemmap_alloc_block_buf(size, node, NULL); | |
2597 | } | |
2598 | ||
8f6aac41 | 2599 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
0aad818b JW |
2600 | int vmemmap_populate_basepages(unsigned long start, unsigned long end, |
2601 | int node); | |
2602 | int vmemmap_populate(unsigned long start, unsigned long end, int node); | |
c2b91e2e | 2603 | void vmemmap_populate_print_last(void); |
0197518c | 2604 | #ifdef CONFIG_MEMORY_HOTPLUG |
0aad818b | 2605 | void vmemmap_free(unsigned long start, unsigned long end); |
0197518c | 2606 | #endif |
46723bfa | 2607 | void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, |
15670bfe | 2608 | unsigned long nr_pages); |
6a46079c | 2609 | |
82ba011b AK |
2610 | enum mf_flags { |
2611 | MF_COUNT_INCREASED = 1 << 0, | |
7329bbeb | 2612 | MF_ACTION_REQUIRED = 1 << 1, |
6751ed65 | 2613 | MF_MUST_KILL = 1 << 2, |
cf870c70 | 2614 | MF_SOFT_OFFLINE = 1 << 3, |
82ba011b | 2615 | }; |
cd42f4a3 | 2616 | extern int memory_failure(unsigned long pfn, int trapno, int flags); |
ea8f5fb8 | 2617 | extern void memory_failure_queue(unsigned long pfn, int trapno, int flags); |
847ce401 | 2618 | extern int unpoison_memory(unsigned long pfn); |
ead07f6a | 2619 | extern int get_hwpoison_page(struct page *page); |
4e41a30c | 2620 | #define put_hwpoison_page(page) put_page(page) |
6a46079c AK |
2621 | extern int sysctl_memory_failure_early_kill; |
2622 | extern int sysctl_memory_failure_recovery; | |
facb6011 | 2623 | extern void shake_page(struct page *p, int access); |
293c07e3 | 2624 | extern atomic_long_t num_poisoned_pages; |
facb6011 | 2625 | extern int soft_offline_page(struct page *page, int flags); |
6a46079c | 2626 | |
cc637b17 XX |
2627 | |
2628 | /* | |
2629 | * Error handlers for various types of pages. | |
2630 | */ | |
cc3e2af4 | 2631 | enum mf_result { |
cc637b17 XX |
2632 | MF_IGNORED, /* Error: cannot be handled */ |
2633 | MF_FAILED, /* Error: handling failed */ | |
2634 | MF_DELAYED, /* Will be handled later */ | |
2635 | MF_RECOVERED, /* Successfully recovered */ | |
2636 | }; | |
2637 | ||
2638 | enum mf_action_page_type { | |
2639 | MF_MSG_KERNEL, | |
2640 | MF_MSG_KERNEL_HIGH_ORDER, | |
2641 | MF_MSG_SLAB, | |
2642 | MF_MSG_DIFFERENT_COMPOUND, | |
2643 | MF_MSG_POISONED_HUGE, | |
2644 | MF_MSG_HUGE, | |
2645 | MF_MSG_FREE_HUGE, | |
8e88be0d | 2646 | MF_MSG_NON_PMD_HUGE, |
cc637b17 XX |
2647 | MF_MSG_UNMAP_FAILED, |
2648 | MF_MSG_DIRTY_SWAPCACHE, | |
2649 | MF_MSG_CLEAN_SWAPCACHE, | |
2650 | MF_MSG_DIRTY_MLOCKED_LRU, | |
2651 | MF_MSG_CLEAN_MLOCKED_LRU, | |
2652 | MF_MSG_DIRTY_UNEVICTABLE_LRU, | |
2653 | MF_MSG_CLEAN_UNEVICTABLE_LRU, | |
2654 | MF_MSG_DIRTY_LRU, | |
2655 | MF_MSG_CLEAN_LRU, | |
2656 | MF_MSG_TRUNCATED_LRU, | |
2657 | MF_MSG_BUDDY, | |
2658 | MF_MSG_BUDDY_2ND, | |
2659 | MF_MSG_UNKNOWN, | |
2660 | }; | |
2661 | ||
47ad8475 AA |
2662 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) |
2663 | extern void clear_huge_page(struct page *page, | |
c79b57e4 | 2664 | unsigned long addr_hint, |
47ad8475 AA |
2665 | unsigned int pages_per_huge_page); |
2666 | extern void copy_user_huge_page(struct page *dst, struct page *src, | |
2667 | unsigned long addr, struct vm_area_struct *vma, | |
2668 | unsigned int pages_per_huge_page); | |
fa4d75c1 MK |
2669 | extern long copy_huge_page_from_user(struct page *dst_page, |
2670 | const void __user *usr_src, | |
810a56b9 MK |
2671 | unsigned int pages_per_huge_page, |
2672 | bool allow_pagefault); | |
47ad8475 AA |
2673 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ |
2674 | ||
e30825f1 | 2675 | extern struct page_ext_operations debug_guardpage_ops; |
e30825f1 | 2676 | |
c0a32fc5 SG |
2677 | #ifdef CONFIG_DEBUG_PAGEALLOC |
2678 | extern unsigned int _debug_guardpage_minorder; | |
e30825f1 | 2679 | extern bool _debug_guardpage_enabled; |
c0a32fc5 SG |
2680 | |
2681 | static inline unsigned int debug_guardpage_minorder(void) | |
2682 | { | |
2683 | return _debug_guardpage_minorder; | |
2684 | } | |
2685 | ||
e30825f1 JK |
2686 | static inline bool debug_guardpage_enabled(void) |
2687 | { | |
2688 | return _debug_guardpage_enabled; | |
2689 | } | |
2690 | ||
c0a32fc5 SG |
2691 | static inline bool page_is_guard(struct page *page) |
2692 | { | |
e30825f1 JK |
2693 | struct page_ext *page_ext; |
2694 | ||
2695 | if (!debug_guardpage_enabled()) | |
2696 | return false; | |
2697 | ||
2698 | page_ext = lookup_page_ext(page); | |
0bb2fd13 YS |
2699 | if (unlikely(!page_ext)) |
2700 | return false; | |
2701 | ||
e30825f1 | 2702 | return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); |
c0a32fc5 SG |
2703 | } |
2704 | #else | |
2705 | static inline unsigned int debug_guardpage_minorder(void) { return 0; } | |
e30825f1 | 2706 | static inline bool debug_guardpage_enabled(void) { return false; } |
c0a32fc5 SG |
2707 | static inline bool page_is_guard(struct page *page) { return false; } |
2708 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
2709 | ||
f9872caf CS |
2710 | #if MAX_NUMNODES > 1 |
2711 | void __init setup_nr_node_ids(void); | |
2712 | #else | |
2713 | static inline void setup_nr_node_ids(void) {} | |
2714 | #endif | |
2715 | ||
1da177e4 LT |
2716 | #endif /* __KERNEL__ */ |
2717 | #endif /* _LINUX_MM_H */ |