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1da177e4 LT |
1 | #ifndef _LINUX_MM_H |
2 | #define _LINUX_MM_H | |
3 | ||
1da177e4 LT |
4 | #include <linux/errno.h> |
5 | ||
6 | #ifdef __KERNEL__ | |
7 | ||
309381fe | 8 | #include <linux/mmdebug.h> |
1da177e4 | 9 | #include <linux/gfp.h> |
187f1882 | 10 | #include <linux/bug.h> |
1da177e4 LT |
11 | #include <linux/list.h> |
12 | #include <linux/mmzone.h> | |
13 | #include <linux/rbtree.h> | |
83aeeada | 14 | #include <linux/atomic.h> |
9a11b49a | 15 | #include <linux/debug_locks.h> |
5b99cd0e | 16 | #include <linux/mm_types.h> |
08677214 | 17 | #include <linux/range.h> |
c6f6b596 | 18 | #include <linux/pfn.h> |
3565fce3 | 19 | #include <linux/percpu-refcount.h> |
e9da73d6 | 20 | #include <linux/bit_spinlock.h> |
b0d40c92 | 21 | #include <linux/shrinker.h> |
9c599024 | 22 | #include <linux/resource.h> |
e30825f1 | 23 | #include <linux/page_ext.h> |
8025e5dd | 24 | #include <linux/err.h> |
fe896d18 | 25 | #include <linux/page_ref.h> |
1da177e4 LT |
26 | |
27 | struct mempolicy; | |
28 | struct anon_vma; | |
bf181b9f | 29 | struct anon_vma_chain; |
4e950f6f | 30 | struct file_ra_state; |
e8edc6e0 | 31 | struct user_struct; |
4e950f6f | 32 | struct writeback_control; |
682aa8e1 | 33 | struct bdi_writeback; |
1da177e4 | 34 | |
597b7305 MH |
35 | void init_mm_internals(void); |
36 | ||
fccc9987 | 37 | #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */ |
1da177e4 | 38 | extern unsigned long max_mapnr; |
fccc9987 JL |
39 | |
40 | static inline void set_max_mapnr(unsigned long limit) | |
41 | { | |
42 | max_mapnr = limit; | |
43 | } | |
44 | #else | |
45 | static inline void set_max_mapnr(unsigned long limit) { } | |
1da177e4 LT |
46 | #endif |
47 | ||
4481374c | 48 | extern unsigned long totalram_pages; |
1da177e4 | 49 | extern void * high_memory; |
1da177e4 LT |
50 | extern int page_cluster; |
51 | ||
52 | #ifdef CONFIG_SYSCTL | |
53 | extern int sysctl_legacy_va_layout; | |
54 | #else | |
55 | #define sysctl_legacy_va_layout 0 | |
56 | #endif | |
57 | ||
d07e2259 DC |
58 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS |
59 | extern const int mmap_rnd_bits_min; | |
60 | extern const int mmap_rnd_bits_max; | |
61 | extern int mmap_rnd_bits __read_mostly; | |
62 | #endif | |
63 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS | |
64 | extern const int mmap_rnd_compat_bits_min; | |
65 | extern const int mmap_rnd_compat_bits_max; | |
66 | extern int mmap_rnd_compat_bits __read_mostly; | |
67 | #endif | |
68 | ||
1da177e4 LT |
69 | #include <asm/page.h> |
70 | #include <asm/pgtable.h> | |
71 | #include <asm/processor.h> | |
1da177e4 | 72 | |
79442ed1 TC |
73 | #ifndef __pa_symbol |
74 | #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) | |
75 | #endif | |
76 | ||
1dff8083 AB |
77 | #ifndef page_to_virt |
78 | #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x))) | |
79 | #endif | |
80 | ||
568c5fe5 LA |
81 | #ifndef lm_alias |
82 | #define lm_alias(x) __va(__pa_symbol(x)) | |
83 | #endif | |
84 | ||
593befa6 DD |
85 | /* |
86 | * To prevent common memory management code establishing | |
87 | * a zero page mapping on a read fault. | |
88 | * This macro should be defined within <asm/pgtable.h>. | |
89 | * s390 does this to prevent multiplexing of hardware bits | |
90 | * related to the physical page in case of virtualization. | |
91 | */ | |
92 | #ifndef mm_forbids_zeropage | |
93 | #define mm_forbids_zeropage(X) (0) | |
94 | #endif | |
95 | ||
ea606cf5 AR |
96 | /* |
97 | * Default maximum number of active map areas, this limits the number of vmas | |
98 | * per mm struct. Users can overwrite this number by sysctl but there is a | |
99 | * problem. | |
100 | * | |
101 | * When a program's coredump is generated as ELF format, a section is created | |
102 | * per a vma. In ELF, the number of sections is represented in unsigned short. | |
103 | * This means the number of sections should be smaller than 65535 at coredump. | |
104 | * Because the kernel adds some informative sections to a image of program at | |
105 | * generating coredump, we need some margin. The number of extra sections is | |
106 | * 1-3 now and depends on arch. We use "5" as safe margin, here. | |
107 | * | |
108 | * ELF extended numbering allows more than 65535 sections, so 16-bit bound is | |
109 | * not a hard limit any more. Although some userspace tools can be surprised by | |
110 | * that. | |
111 | */ | |
112 | #define MAPCOUNT_ELF_CORE_MARGIN (5) | |
113 | #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) | |
114 | ||
115 | extern int sysctl_max_map_count; | |
116 | ||
c9b1d098 | 117 | extern unsigned long sysctl_user_reserve_kbytes; |
4eeab4f5 | 118 | extern unsigned long sysctl_admin_reserve_kbytes; |
c9b1d098 | 119 | |
49f0ce5f JM |
120 | extern int sysctl_overcommit_memory; |
121 | extern int sysctl_overcommit_ratio; | |
122 | extern unsigned long sysctl_overcommit_kbytes; | |
123 | ||
124 | extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *, | |
125 | size_t *, loff_t *); | |
126 | extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *, | |
127 | size_t *, loff_t *); | |
128 | ||
1da177e4 LT |
129 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
130 | ||
27ac792c AR |
131 | /* to align the pointer to the (next) page boundary */ |
132 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) | |
133 | ||
0fa73b86 | 134 | /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */ |
1061b0d2 | 135 | #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)(addr), PAGE_SIZE) |
0fa73b86 | 136 | |
1da177e4 LT |
137 | /* |
138 | * Linux kernel virtual memory manager primitives. | |
139 | * The idea being to have a "virtual" mm in the same way | |
140 | * we have a virtual fs - giving a cleaner interface to the | |
141 | * mm details, and allowing different kinds of memory mappings | |
142 | * (from shared memory to executable loading to arbitrary | |
143 | * mmap() functions). | |
144 | */ | |
145 | ||
c43692e8 CL |
146 | extern struct kmem_cache *vm_area_cachep; |
147 | ||
1da177e4 | 148 | #ifndef CONFIG_MMU |
8feae131 DH |
149 | extern struct rb_root nommu_region_tree; |
150 | extern struct rw_semaphore nommu_region_sem; | |
1da177e4 LT |
151 | |
152 | extern unsigned int kobjsize(const void *objp); | |
153 | #endif | |
154 | ||
155 | /* | |
605d9288 | 156 | * vm_flags in vm_area_struct, see mm_types.h. |
bcf66917 | 157 | * When changing, update also include/trace/events/mmflags.h |
1da177e4 | 158 | */ |
cc2383ec KK |
159 | #define VM_NONE 0x00000000 |
160 | ||
1da177e4 LT |
161 | #define VM_READ 0x00000001 /* currently active flags */ |
162 | #define VM_WRITE 0x00000002 | |
163 | #define VM_EXEC 0x00000004 | |
164 | #define VM_SHARED 0x00000008 | |
165 | ||
7e2cff42 | 166 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
1da177e4 LT |
167 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
168 | #define VM_MAYWRITE 0x00000020 | |
169 | #define VM_MAYEXEC 0x00000040 | |
170 | #define VM_MAYSHARE 0x00000080 | |
171 | ||
172 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ | |
16ba6f81 | 173 | #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */ |
6aab341e | 174 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
1da177e4 | 175 | #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ |
16ba6f81 | 176 | #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */ |
1da177e4 | 177 | |
1da177e4 LT |
178 | #define VM_LOCKED 0x00002000 |
179 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ | |
180 | ||
181 | /* Used by sys_madvise() */ | |
182 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ | |
183 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ | |
184 | ||
185 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ | |
186 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ | |
de60f5f1 | 187 | #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */ |
1da177e4 | 188 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
cdfd4325 | 189 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
1da177e4 | 190 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
cc2383ec | 191 | #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ |
4aae7e43 | 192 | #define VM_ARCH_2 0x02000000 |
0103bd16 | 193 | #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */ |
d00806b1 | 194 | |
d9104d1c CG |
195 | #ifdef CONFIG_MEM_SOFT_DIRTY |
196 | # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */ | |
197 | #else | |
198 | # define VM_SOFTDIRTY 0 | |
199 | #endif | |
200 | ||
b379d790 | 201 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
cc2383ec KK |
202 | #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */ |
203 | #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ | |
f8af4da3 | 204 | #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ |
1da177e4 | 205 | |
63c17fb8 DH |
206 | #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS |
207 | #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */ | |
208 | #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */ | |
209 | #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */ | |
210 | #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */ | |
211 | #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0) | |
212 | #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1) | |
213 | #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2) | |
214 | #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3) | |
215 | #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */ | |
216 | ||
cc2383ec KK |
217 | #if defined(CONFIG_X86) |
218 | # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ | |
8f62c883 DH |
219 | #if defined (CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS) |
220 | # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0 | |
221 | # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */ | |
222 | # define VM_PKEY_BIT1 VM_HIGH_ARCH_1 | |
223 | # define VM_PKEY_BIT2 VM_HIGH_ARCH_2 | |
224 | # define VM_PKEY_BIT3 VM_HIGH_ARCH_3 | |
225 | #endif | |
cc2383ec KK |
226 | #elif defined(CONFIG_PPC) |
227 | # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */ | |
228 | #elif defined(CONFIG_PARISC) | |
229 | # define VM_GROWSUP VM_ARCH_1 | |
9ca52ed9 JH |
230 | #elif defined(CONFIG_METAG) |
231 | # define VM_GROWSUP VM_ARCH_1 | |
cc2383ec KK |
232 | #elif defined(CONFIG_IA64) |
233 | # define VM_GROWSUP VM_ARCH_1 | |
234 | #elif !defined(CONFIG_MMU) | |
235 | # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */ | |
236 | #endif | |
237 | ||
4aae7e43 QR |
238 | #if defined(CONFIG_X86) |
239 | /* MPX specific bounds table or bounds directory */ | |
240 | # define VM_MPX VM_ARCH_2 | |
241 | #endif | |
242 | ||
cc2383ec KK |
243 | #ifndef VM_GROWSUP |
244 | # define VM_GROWSUP VM_NONE | |
245 | #endif | |
246 | ||
a8bef8ff MG |
247 | /* Bits set in the VMA until the stack is in its final location */ |
248 | #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) | |
249 | ||
1da177e4 LT |
250 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
251 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS | |
252 | #endif | |
253 | ||
254 | #ifdef CONFIG_STACK_GROWSUP | |
30bdbb78 | 255 | #define VM_STACK VM_GROWSUP |
1da177e4 | 256 | #else |
30bdbb78 | 257 | #define VM_STACK VM_GROWSDOWN |
1da177e4 LT |
258 | #endif |
259 | ||
30bdbb78 KK |
260 | #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
261 | ||
b291f000 | 262 | /* |
78f11a25 AA |
263 | * Special vmas that are non-mergable, non-mlock()able. |
264 | * Note: mm/huge_memory.c VM_NO_THP depends on this definition. | |
b291f000 | 265 | */ |
9050d7eb | 266 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP) |
b291f000 | 267 | |
a0715cc2 AT |
268 | /* This mask defines which mm->def_flags a process can inherit its parent */ |
269 | #define VM_INIT_DEF_MASK VM_NOHUGEPAGE | |
270 | ||
de60f5f1 EM |
271 | /* This mask is used to clear all the VMA flags used by mlock */ |
272 | #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT)) | |
273 | ||
1da177e4 LT |
274 | /* |
275 | * mapping from the currently active vm_flags protection bits (the | |
276 | * low four bits) to a page protection mask.. | |
277 | */ | |
278 | extern pgprot_t protection_map[16]; | |
279 | ||
d0217ac0 | 280 | #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ |
9b4bdd2f KS |
281 | #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */ |
282 | #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */ | |
283 | #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */ | |
284 | #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */ | |
285 | #define FAULT_FLAG_TRIED 0x20 /* Second try */ | |
286 | #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */ | |
1b2ee126 | 287 | #define FAULT_FLAG_REMOTE 0x80 /* faulting for non current tsk/mm */ |
d61172b4 | 288 | #define FAULT_FLAG_INSTRUCTION 0x100 /* The fault was during an instruction fetch */ |
d0217ac0 | 289 | |
282a8e03 RZ |
290 | #define FAULT_FLAG_TRACE \ |
291 | { FAULT_FLAG_WRITE, "WRITE" }, \ | |
292 | { FAULT_FLAG_MKWRITE, "MKWRITE" }, \ | |
293 | { FAULT_FLAG_ALLOW_RETRY, "ALLOW_RETRY" }, \ | |
294 | { FAULT_FLAG_RETRY_NOWAIT, "RETRY_NOWAIT" }, \ | |
295 | { FAULT_FLAG_KILLABLE, "KILLABLE" }, \ | |
296 | { FAULT_FLAG_TRIED, "TRIED" }, \ | |
297 | { FAULT_FLAG_USER, "USER" }, \ | |
298 | { FAULT_FLAG_REMOTE, "REMOTE" }, \ | |
299 | { FAULT_FLAG_INSTRUCTION, "INSTRUCTION" } | |
300 | ||
54cb8821 | 301 | /* |
d0217ac0 | 302 | * vm_fault is filled by the the pagefault handler and passed to the vma's |
83c54070 NP |
303 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
304 | * of VM_FAULT_xxx flags that give details about how the fault was handled. | |
54cb8821 | 305 | * |
c20cd45e MH |
306 | * MM layer fills up gfp_mask for page allocations but fault handler might |
307 | * alter it if its implementation requires a different allocation context. | |
308 | * | |
9b4bdd2f | 309 | * pgoff should be used in favour of virtual_address, if possible. |
54cb8821 | 310 | */ |
d0217ac0 | 311 | struct vm_fault { |
82b0f8c3 | 312 | struct vm_area_struct *vma; /* Target VMA */ |
d0217ac0 | 313 | unsigned int flags; /* FAULT_FLAG_xxx flags */ |
c20cd45e | 314 | gfp_t gfp_mask; /* gfp mask to be used for allocations */ |
d0217ac0 | 315 | pgoff_t pgoff; /* Logical page offset based on vma */ |
82b0f8c3 | 316 | unsigned long address; /* Faulting virtual address */ |
82b0f8c3 | 317 | pmd_t *pmd; /* Pointer to pmd entry matching |
2994302b | 318 | * the 'address' */ |
a2d58167 DJ |
319 | pud_t *pud; /* Pointer to pud entry matching |
320 | * the 'address' | |
321 | */ | |
2994302b | 322 | pte_t orig_pte; /* Value of PTE at the time of fault */ |
d0217ac0 | 323 | |
3917048d JK |
324 | struct page *cow_page; /* Page handler may use for COW fault */ |
325 | struct mem_cgroup *memcg; /* Cgroup cow_page belongs to */ | |
d0217ac0 | 326 | struct page *page; /* ->fault handlers should return a |
83c54070 | 327 | * page here, unless VM_FAULT_NOPAGE |
d0217ac0 | 328 | * is set (which is also implied by |
83c54070 | 329 | * VM_FAULT_ERROR). |
d0217ac0 | 330 | */ |
82b0f8c3 | 331 | /* These three entries are valid only while holding ptl lock */ |
bae473a4 KS |
332 | pte_t *pte; /* Pointer to pte entry matching |
333 | * the 'address'. NULL if the page | |
334 | * table hasn't been allocated. | |
335 | */ | |
336 | spinlock_t *ptl; /* Page table lock. | |
337 | * Protects pte page table if 'pte' | |
338 | * is not NULL, otherwise pmd. | |
339 | */ | |
7267ec00 KS |
340 | pgtable_t prealloc_pte; /* Pre-allocated pte page table. |
341 | * vm_ops->map_pages() calls | |
342 | * alloc_set_pte() from atomic context. | |
343 | * do_fault_around() pre-allocates | |
344 | * page table to avoid allocation from | |
345 | * atomic context. | |
346 | */ | |
54cb8821 | 347 | }; |
1da177e4 | 348 | |
c791ace1 DJ |
349 | /* page entry size for vm->huge_fault() */ |
350 | enum page_entry_size { | |
351 | PE_SIZE_PTE = 0, | |
352 | PE_SIZE_PMD, | |
353 | PE_SIZE_PUD, | |
354 | }; | |
355 | ||
1da177e4 LT |
356 | /* |
357 | * These are the virtual MM functions - opening of an area, closing and | |
358 | * unmapping it (needed to keep files on disk up-to-date etc), pointer | |
359 | * to the functions called when a no-page or a wp-page exception occurs. | |
360 | */ | |
361 | struct vm_operations_struct { | |
362 | void (*open)(struct vm_area_struct * area); | |
363 | void (*close)(struct vm_area_struct * area); | |
5477e70a | 364 | int (*mremap)(struct vm_area_struct * area); |
11bac800 | 365 | int (*fault)(struct vm_fault *vmf); |
c791ace1 | 366 | int (*huge_fault)(struct vm_fault *vmf, enum page_entry_size pe_size); |
82b0f8c3 | 367 | void (*map_pages)(struct vm_fault *vmf, |
bae473a4 | 368 | pgoff_t start_pgoff, pgoff_t end_pgoff); |
9637a5ef DH |
369 | |
370 | /* notification that a previously read-only page is about to become | |
371 | * writable, if an error is returned it will cause a SIGBUS */ | |
11bac800 | 372 | int (*page_mkwrite)(struct vm_fault *vmf); |
28b2ee20 | 373 | |
dd906184 | 374 | /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */ |
11bac800 | 375 | int (*pfn_mkwrite)(struct vm_fault *vmf); |
dd906184 | 376 | |
28b2ee20 RR |
377 | /* called by access_process_vm when get_user_pages() fails, typically |
378 | * for use by special VMAs that can switch between memory and hardware | |
379 | */ | |
380 | int (*access)(struct vm_area_struct *vma, unsigned long addr, | |
381 | void *buf, int len, int write); | |
78d683e8 AL |
382 | |
383 | /* Called by the /proc/PID/maps code to ask the vma whether it | |
384 | * has a special name. Returning non-NULL will also cause this | |
385 | * vma to be dumped unconditionally. */ | |
386 | const char *(*name)(struct vm_area_struct *vma); | |
387 | ||
1da177e4 | 388 | #ifdef CONFIG_NUMA |
a6020ed7 LS |
389 | /* |
390 | * set_policy() op must add a reference to any non-NULL @new mempolicy | |
391 | * to hold the policy upon return. Caller should pass NULL @new to | |
392 | * remove a policy and fall back to surrounding context--i.e. do not | |
393 | * install a MPOL_DEFAULT policy, nor the task or system default | |
394 | * mempolicy. | |
395 | */ | |
1da177e4 | 396 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
a6020ed7 LS |
397 | |
398 | /* | |
399 | * get_policy() op must add reference [mpol_get()] to any policy at | |
400 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure | |
401 | * in mm/mempolicy.c will do this automatically. | |
402 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not | |
403 | * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. | |
404 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op | |
405 | * must return NULL--i.e., do not "fallback" to task or system default | |
406 | * policy. | |
407 | */ | |
1da177e4 LT |
408 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
409 | unsigned long addr); | |
410 | #endif | |
667a0a06 DV |
411 | /* |
412 | * Called by vm_normal_page() for special PTEs to find the | |
413 | * page for @addr. This is useful if the default behavior | |
414 | * (using pte_page()) would not find the correct page. | |
415 | */ | |
416 | struct page *(*find_special_page)(struct vm_area_struct *vma, | |
417 | unsigned long addr); | |
1da177e4 LT |
418 | }; |
419 | ||
420 | struct mmu_gather; | |
421 | struct inode; | |
422 | ||
349aef0b AM |
423 | #define page_private(page) ((page)->private) |
424 | #define set_page_private(page, v) ((page)->private = (v)) | |
4c21e2f2 | 425 | |
5c7fb56e DW |
426 | #if !defined(__HAVE_ARCH_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE) |
427 | static inline int pmd_devmap(pmd_t pmd) | |
428 | { | |
429 | return 0; | |
430 | } | |
a00cc7d9 MW |
431 | static inline int pud_devmap(pud_t pud) |
432 | { | |
433 | return 0; | |
434 | } | |
b59f65fa KS |
435 | static inline int pgd_devmap(pgd_t pgd) |
436 | { | |
437 | return 0; | |
438 | } | |
5c7fb56e DW |
439 | #endif |
440 | ||
1da177e4 LT |
441 | /* |
442 | * FIXME: take this include out, include page-flags.h in | |
443 | * files which need it (119 of them) | |
444 | */ | |
445 | #include <linux/page-flags.h> | |
71e3aac0 | 446 | #include <linux/huge_mm.h> |
1da177e4 LT |
447 | |
448 | /* | |
449 | * Methods to modify the page usage count. | |
450 | * | |
451 | * What counts for a page usage: | |
452 | * - cache mapping (page->mapping) | |
453 | * - private data (page->private) | |
454 | * - page mapped in a task's page tables, each mapping | |
455 | * is counted separately | |
456 | * | |
457 | * Also, many kernel routines increase the page count before a critical | |
458 | * routine so they can be sure the page doesn't go away from under them. | |
1da177e4 LT |
459 | */ |
460 | ||
461 | /* | |
da6052f7 | 462 | * Drop a ref, return true if the refcount fell to zero (the page has no users) |
1da177e4 | 463 | */ |
7c8ee9a8 NP |
464 | static inline int put_page_testzero(struct page *page) |
465 | { | |
fe896d18 JK |
466 | VM_BUG_ON_PAGE(page_ref_count(page) == 0, page); |
467 | return page_ref_dec_and_test(page); | |
7c8ee9a8 | 468 | } |
1da177e4 LT |
469 | |
470 | /* | |
7c8ee9a8 NP |
471 | * Try to grab a ref unless the page has a refcount of zero, return false if |
472 | * that is the case. | |
8e0861fa AK |
473 | * This can be called when MMU is off so it must not access |
474 | * any of the virtual mappings. | |
1da177e4 | 475 | */ |
7c8ee9a8 NP |
476 | static inline int get_page_unless_zero(struct page *page) |
477 | { | |
fe896d18 | 478 | return page_ref_add_unless(page, 1, 0); |
7c8ee9a8 | 479 | } |
1da177e4 | 480 | |
53df8fdc | 481 | extern int page_is_ram(unsigned long pfn); |
124fe20d DW |
482 | |
483 | enum { | |
484 | REGION_INTERSECTS, | |
485 | REGION_DISJOINT, | |
486 | REGION_MIXED, | |
487 | }; | |
488 | ||
1c29f25b TK |
489 | int region_intersects(resource_size_t offset, size_t size, unsigned long flags, |
490 | unsigned long desc); | |
53df8fdc | 491 | |
48667e7a | 492 | /* Support for virtually mapped pages */ |
b3bdda02 CL |
493 | struct page *vmalloc_to_page(const void *addr); |
494 | unsigned long vmalloc_to_pfn(const void *addr); | |
48667e7a | 495 | |
0738c4bb PM |
496 | /* |
497 | * Determine if an address is within the vmalloc range | |
498 | * | |
499 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there | |
500 | * is no special casing required. | |
501 | */ | |
bb00a789 | 502 | static inline bool is_vmalloc_addr(const void *x) |
9e2779fa | 503 | { |
0738c4bb | 504 | #ifdef CONFIG_MMU |
9e2779fa CL |
505 | unsigned long addr = (unsigned long)x; |
506 | ||
507 | return addr >= VMALLOC_START && addr < VMALLOC_END; | |
0738c4bb | 508 | #else |
bb00a789 | 509 | return false; |
8ca3ed87 | 510 | #endif |
0738c4bb | 511 | } |
81ac3ad9 KH |
512 | #ifdef CONFIG_MMU |
513 | extern int is_vmalloc_or_module_addr(const void *x); | |
514 | #else | |
934831d0 | 515 | static inline int is_vmalloc_or_module_addr(const void *x) |
81ac3ad9 KH |
516 | { |
517 | return 0; | |
518 | } | |
519 | #endif | |
9e2779fa | 520 | |
a7c3e901 MH |
521 | extern void *kvmalloc_node(size_t size, gfp_t flags, int node); |
522 | static inline void *kvmalloc(size_t size, gfp_t flags) | |
523 | { | |
524 | return kvmalloc_node(size, flags, NUMA_NO_NODE); | |
525 | } | |
526 | static inline void *kvzalloc_node(size_t size, gfp_t flags, int node) | |
527 | { | |
528 | return kvmalloc_node(size, flags | __GFP_ZERO, node); | |
529 | } | |
530 | static inline void *kvzalloc(size_t size, gfp_t flags) | |
531 | { | |
532 | return kvmalloc(size, flags | __GFP_ZERO); | |
533 | } | |
534 | ||
752ade68 MH |
535 | static inline void *kvmalloc_array(size_t n, size_t size, gfp_t flags) |
536 | { | |
537 | if (size != 0 && n > SIZE_MAX / size) | |
538 | return NULL; | |
539 | ||
540 | return kvmalloc(n * size, flags); | |
541 | } | |
542 | ||
39f1f78d AV |
543 | extern void kvfree(const void *addr); |
544 | ||
53f9263b KS |
545 | static inline atomic_t *compound_mapcount_ptr(struct page *page) |
546 | { | |
547 | return &page[1].compound_mapcount; | |
548 | } | |
549 | ||
550 | static inline int compound_mapcount(struct page *page) | |
551 | { | |
5f527c2b | 552 | VM_BUG_ON_PAGE(!PageCompound(page), page); |
53f9263b KS |
553 | page = compound_head(page); |
554 | return atomic_read(compound_mapcount_ptr(page)) + 1; | |
555 | } | |
556 | ||
70b50f94 AA |
557 | /* |
558 | * The atomic page->_mapcount, starts from -1: so that transitions | |
559 | * both from it and to it can be tracked, using atomic_inc_and_test | |
560 | * and atomic_add_negative(-1). | |
561 | */ | |
22b751c3 | 562 | static inline void page_mapcount_reset(struct page *page) |
70b50f94 AA |
563 | { |
564 | atomic_set(&(page)->_mapcount, -1); | |
565 | } | |
566 | ||
b20ce5e0 KS |
567 | int __page_mapcount(struct page *page); |
568 | ||
70b50f94 AA |
569 | static inline int page_mapcount(struct page *page) |
570 | { | |
1d148e21 | 571 | VM_BUG_ON_PAGE(PageSlab(page), page); |
53f9263b | 572 | |
b20ce5e0 KS |
573 | if (unlikely(PageCompound(page))) |
574 | return __page_mapcount(page); | |
575 | return atomic_read(&page->_mapcount) + 1; | |
576 | } | |
577 | ||
578 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
579 | int total_mapcount(struct page *page); | |
6d0a07ed | 580 | int page_trans_huge_mapcount(struct page *page, int *total_mapcount); |
b20ce5e0 KS |
581 | #else |
582 | static inline int total_mapcount(struct page *page) | |
583 | { | |
584 | return page_mapcount(page); | |
70b50f94 | 585 | } |
6d0a07ed AA |
586 | static inline int page_trans_huge_mapcount(struct page *page, |
587 | int *total_mapcount) | |
588 | { | |
589 | int mapcount = page_mapcount(page); | |
590 | if (total_mapcount) | |
591 | *total_mapcount = mapcount; | |
592 | return mapcount; | |
593 | } | |
b20ce5e0 | 594 | #endif |
70b50f94 | 595 | |
b49af68f CL |
596 | static inline struct page *virt_to_head_page(const void *x) |
597 | { | |
598 | struct page *page = virt_to_page(x); | |
ccaafd7f | 599 | |
1d798ca3 | 600 | return compound_head(page); |
b49af68f CL |
601 | } |
602 | ||
ddc58f27 KS |
603 | void __put_page(struct page *page); |
604 | ||
1d7ea732 | 605 | void put_pages_list(struct list_head *pages); |
1da177e4 | 606 | |
8dfcc9ba | 607 | void split_page(struct page *page, unsigned int order); |
8dfcc9ba | 608 | |
33f2ef89 AW |
609 | /* |
610 | * Compound pages have a destructor function. Provide a | |
611 | * prototype for that function and accessor functions. | |
f1e61557 | 612 | * These are _only_ valid on the head of a compound page. |
33f2ef89 | 613 | */ |
f1e61557 KS |
614 | typedef void compound_page_dtor(struct page *); |
615 | ||
616 | /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */ | |
617 | enum compound_dtor_id { | |
618 | NULL_COMPOUND_DTOR, | |
619 | COMPOUND_PAGE_DTOR, | |
620 | #ifdef CONFIG_HUGETLB_PAGE | |
621 | HUGETLB_PAGE_DTOR, | |
9a982250 KS |
622 | #endif |
623 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
624 | TRANSHUGE_PAGE_DTOR, | |
f1e61557 KS |
625 | #endif |
626 | NR_COMPOUND_DTORS, | |
627 | }; | |
628 | extern compound_page_dtor * const compound_page_dtors[]; | |
33f2ef89 AW |
629 | |
630 | static inline void set_compound_page_dtor(struct page *page, | |
f1e61557 | 631 | enum compound_dtor_id compound_dtor) |
33f2ef89 | 632 | { |
f1e61557 KS |
633 | VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page); |
634 | page[1].compound_dtor = compound_dtor; | |
33f2ef89 AW |
635 | } |
636 | ||
637 | static inline compound_page_dtor *get_compound_page_dtor(struct page *page) | |
638 | { | |
f1e61557 KS |
639 | VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page); |
640 | return compound_page_dtors[page[1].compound_dtor]; | |
33f2ef89 AW |
641 | } |
642 | ||
d00181b9 | 643 | static inline unsigned int compound_order(struct page *page) |
d85f3385 | 644 | { |
6d777953 | 645 | if (!PageHead(page)) |
d85f3385 | 646 | return 0; |
e4b294c2 | 647 | return page[1].compound_order; |
d85f3385 CL |
648 | } |
649 | ||
f1e61557 | 650 | static inline void set_compound_order(struct page *page, unsigned int order) |
d85f3385 | 651 | { |
e4b294c2 | 652 | page[1].compound_order = order; |
d85f3385 CL |
653 | } |
654 | ||
9a982250 KS |
655 | void free_compound_page(struct page *page); |
656 | ||
3dece370 | 657 | #ifdef CONFIG_MMU |
14fd403f AA |
658 | /* |
659 | * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when | |
660 | * servicing faults for write access. In the normal case, do always want | |
661 | * pte_mkwrite. But get_user_pages can cause write faults for mappings | |
662 | * that do not have writing enabled, when used by access_process_vm. | |
663 | */ | |
664 | static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) | |
665 | { | |
666 | if (likely(vma->vm_flags & VM_WRITE)) | |
667 | pte = pte_mkwrite(pte); | |
668 | return pte; | |
669 | } | |
8c6e50b0 | 670 | |
82b0f8c3 | 671 | int alloc_set_pte(struct vm_fault *vmf, struct mem_cgroup *memcg, |
7267ec00 | 672 | struct page *page); |
9118c0cb | 673 | int finish_fault(struct vm_fault *vmf); |
66a6197c | 674 | int finish_mkwrite_fault(struct vm_fault *vmf); |
3dece370 | 675 | #endif |
14fd403f | 676 | |
1da177e4 LT |
677 | /* |
678 | * Multiple processes may "see" the same page. E.g. for untouched | |
679 | * mappings of /dev/null, all processes see the same page full of | |
680 | * zeroes, and text pages of executables and shared libraries have | |
681 | * only one copy in memory, at most, normally. | |
682 | * | |
683 | * For the non-reserved pages, page_count(page) denotes a reference count. | |
7e871b6c PBG |
684 | * page_count() == 0 means the page is free. page->lru is then used for |
685 | * freelist management in the buddy allocator. | |
da6052f7 | 686 | * page_count() > 0 means the page has been allocated. |
1da177e4 | 687 | * |
da6052f7 NP |
688 | * Pages are allocated by the slab allocator in order to provide memory |
689 | * to kmalloc and kmem_cache_alloc. In this case, the management of the | |
690 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c | |
691 | * unless a particular usage is carefully commented. (the responsibility of | |
692 | * freeing the kmalloc memory is the caller's, of course). | |
1da177e4 | 693 | * |
da6052f7 NP |
694 | * A page may be used by anyone else who does a __get_free_page(). |
695 | * In this case, page_count still tracks the references, and should only | |
696 | * be used through the normal accessor functions. The top bits of page->flags | |
697 | * and page->virtual store page management information, but all other fields | |
698 | * are unused and could be used privately, carefully. The management of this | |
699 | * page is the responsibility of the one who allocated it, and those who have | |
700 | * subsequently been given references to it. | |
701 | * | |
702 | * The other pages (we may call them "pagecache pages") are completely | |
1da177e4 LT |
703 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
704 | * The following discussion applies only to them. | |
705 | * | |
da6052f7 NP |
706 | * A pagecache page contains an opaque `private' member, which belongs to the |
707 | * page's address_space. Usually, this is the address of a circular list of | |
708 | * the page's disk buffers. PG_private must be set to tell the VM to call | |
709 | * into the filesystem to release these pages. | |
1da177e4 | 710 | * |
da6052f7 NP |
711 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
712 | * is the pointer to the inode, and page->index is the file offset of the page, | |
ea1754a0 | 713 | * in units of PAGE_SIZE. |
1da177e4 | 714 | * |
da6052f7 NP |
715 | * If pagecache pages are not associated with an inode, they are said to be |
716 | * anonymous pages. These may become associated with the swapcache, and in that | |
717 | * case PG_swapcache is set, and page->private is an offset into the swapcache. | |
1da177e4 | 718 | * |
da6052f7 NP |
719 | * In either case (swapcache or inode backed), the pagecache itself holds one |
720 | * reference to the page. Setting PG_private should also increment the | |
721 | * refcount. The each user mapping also has a reference to the page. | |
1da177e4 | 722 | * |
da6052f7 NP |
723 | * The pagecache pages are stored in a per-mapping radix tree, which is |
724 | * rooted at mapping->page_tree, and indexed by offset. | |
725 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space | |
726 | * lists, we instead now tag pages as dirty/writeback in the radix tree. | |
1da177e4 | 727 | * |
da6052f7 | 728 | * All pagecache pages may be subject to I/O: |
1da177e4 LT |
729 | * - inode pages may need to be read from disk, |
730 | * - inode pages which have been modified and are MAP_SHARED may need | |
da6052f7 NP |
731 | * to be written back to the inode on disk, |
732 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been | |
733 | * modified may need to be swapped out to swap space and (later) to be read | |
734 | * back into memory. | |
1da177e4 LT |
735 | */ |
736 | ||
737 | /* | |
738 | * The zone field is never updated after free_area_init_core() | |
739 | * sets it, so none of the operations on it need to be atomic. | |
1da177e4 | 740 | */ |
348f8b6c | 741 | |
90572890 | 742 | /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */ |
07808b74 | 743 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
d41dee36 AW |
744 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
745 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) | |
90572890 | 746 | #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH) |
d41dee36 | 747 | |
348f8b6c | 748 | /* |
25985edc | 749 | * Define the bit shifts to access each section. For non-existent |
348f8b6c DH |
750 | * sections we define the shift as 0; that plus a 0 mask ensures |
751 | * the compiler will optimise away reference to them. | |
752 | */ | |
d41dee36 AW |
753 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
754 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) | |
755 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) | |
90572890 | 756 | #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0)) |
348f8b6c | 757 | |
bce54bbf WD |
758 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ |
759 | #ifdef NODE_NOT_IN_PAGE_FLAGS | |
89689ae7 | 760 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
761 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
762 | SECTIONS_PGOFF : ZONES_PGOFF) | |
d41dee36 | 763 | #else |
89689ae7 | 764 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
765 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
766 | NODES_PGOFF : ZONES_PGOFF) | |
89689ae7 CL |
767 | #endif |
768 | ||
bd8029b6 | 769 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
348f8b6c | 770 | |
9223b419 CL |
771 | #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
772 | #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS | |
348f8b6c DH |
773 | #endif |
774 | ||
d41dee36 AW |
775 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
776 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) | |
777 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) | |
834a964a | 778 | #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1) |
89689ae7 | 779 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
348f8b6c | 780 | |
33dd4e0e | 781 | static inline enum zone_type page_zonenum(const struct page *page) |
1da177e4 | 782 | { |
348f8b6c | 783 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
1da177e4 | 784 | } |
1da177e4 | 785 | |
260ae3f7 DW |
786 | #ifdef CONFIG_ZONE_DEVICE |
787 | static inline bool is_zone_device_page(const struct page *page) | |
788 | { | |
789 | return page_zonenum(page) == ZONE_DEVICE; | |
790 | } | |
791 | #else | |
792 | static inline bool is_zone_device_page(const struct page *page) | |
793 | { | |
794 | return false; | |
795 | } | |
796 | #endif | |
797 | ||
3565fce3 DW |
798 | static inline void get_page(struct page *page) |
799 | { | |
800 | page = compound_head(page); | |
801 | /* | |
802 | * Getting a normal page or the head of a compound page | |
0139aa7b | 803 | * requires to already have an elevated page->_refcount. |
3565fce3 | 804 | */ |
fe896d18 JK |
805 | VM_BUG_ON_PAGE(page_ref_count(page) <= 0, page); |
806 | page_ref_inc(page); | |
3565fce3 DW |
807 | } |
808 | ||
809 | static inline void put_page(struct page *page) | |
810 | { | |
811 | page = compound_head(page); | |
812 | ||
813 | if (put_page_testzero(page)) | |
814 | __put_page(page); | |
3565fce3 DW |
815 | } |
816 | ||
9127ab4f CS |
817 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
818 | #define SECTION_IN_PAGE_FLAGS | |
819 | #endif | |
820 | ||
89689ae7 | 821 | /* |
7a8010cd VB |
822 | * The identification function is mainly used by the buddy allocator for |
823 | * determining if two pages could be buddies. We are not really identifying | |
824 | * the zone since we could be using the section number id if we do not have | |
825 | * node id available in page flags. | |
826 | * We only guarantee that it will return the same value for two combinable | |
827 | * pages in a zone. | |
89689ae7 | 828 | */ |
cb2b95e1 AW |
829 | static inline int page_zone_id(struct page *page) |
830 | { | |
89689ae7 | 831 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
348f8b6c DH |
832 | } |
833 | ||
25ba77c1 | 834 | static inline int zone_to_nid(struct zone *zone) |
89fa3024 | 835 | { |
d5f541ed CL |
836 | #ifdef CONFIG_NUMA |
837 | return zone->node; | |
838 | #else | |
839 | return 0; | |
840 | #endif | |
89fa3024 CL |
841 | } |
842 | ||
89689ae7 | 843 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
33dd4e0e | 844 | extern int page_to_nid(const struct page *page); |
89689ae7 | 845 | #else |
33dd4e0e | 846 | static inline int page_to_nid(const struct page *page) |
d41dee36 | 847 | { |
89689ae7 | 848 | return (page->flags >> NODES_PGSHIFT) & NODES_MASK; |
d41dee36 | 849 | } |
89689ae7 CL |
850 | #endif |
851 | ||
57e0a030 | 852 | #ifdef CONFIG_NUMA_BALANCING |
90572890 | 853 | static inline int cpu_pid_to_cpupid(int cpu, int pid) |
57e0a030 | 854 | { |
90572890 | 855 | return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK); |
57e0a030 MG |
856 | } |
857 | ||
90572890 | 858 | static inline int cpupid_to_pid(int cpupid) |
57e0a030 | 859 | { |
90572890 | 860 | return cpupid & LAST__PID_MASK; |
57e0a030 | 861 | } |
b795854b | 862 | |
90572890 | 863 | static inline int cpupid_to_cpu(int cpupid) |
b795854b | 864 | { |
90572890 | 865 | return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK; |
b795854b MG |
866 | } |
867 | ||
90572890 | 868 | static inline int cpupid_to_nid(int cpupid) |
b795854b | 869 | { |
90572890 | 870 | return cpu_to_node(cpupid_to_cpu(cpupid)); |
b795854b MG |
871 | } |
872 | ||
90572890 | 873 | static inline bool cpupid_pid_unset(int cpupid) |
57e0a030 | 874 | { |
90572890 | 875 | return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK); |
b795854b MG |
876 | } |
877 | ||
90572890 | 878 | static inline bool cpupid_cpu_unset(int cpupid) |
b795854b | 879 | { |
90572890 | 880 | return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK); |
b795854b MG |
881 | } |
882 | ||
8c8a743c PZ |
883 | static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid) |
884 | { | |
885 | return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid); | |
886 | } | |
887 | ||
888 | #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid) | |
90572890 PZ |
889 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
890 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
b795854b | 891 | { |
1ae71d03 | 892 | return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK); |
b795854b | 893 | } |
90572890 PZ |
894 | |
895 | static inline int page_cpupid_last(struct page *page) | |
896 | { | |
897 | return page->_last_cpupid; | |
898 | } | |
899 | static inline void page_cpupid_reset_last(struct page *page) | |
b795854b | 900 | { |
1ae71d03 | 901 | page->_last_cpupid = -1 & LAST_CPUPID_MASK; |
57e0a030 MG |
902 | } |
903 | #else | |
90572890 | 904 | static inline int page_cpupid_last(struct page *page) |
75980e97 | 905 | { |
90572890 | 906 | return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK; |
75980e97 PZ |
907 | } |
908 | ||
90572890 | 909 | extern int page_cpupid_xchg_last(struct page *page, int cpupid); |
75980e97 | 910 | |
90572890 | 911 | static inline void page_cpupid_reset_last(struct page *page) |
75980e97 | 912 | { |
09940a4f | 913 | page->flags |= LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT; |
75980e97 | 914 | } |
90572890 PZ |
915 | #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */ |
916 | #else /* !CONFIG_NUMA_BALANCING */ | |
917 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
57e0a030 | 918 | { |
90572890 | 919 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
920 | } |
921 | ||
90572890 | 922 | static inline int page_cpupid_last(struct page *page) |
57e0a030 | 923 | { |
90572890 | 924 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
925 | } |
926 | ||
90572890 | 927 | static inline int cpupid_to_nid(int cpupid) |
b795854b MG |
928 | { |
929 | return -1; | |
930 | } | |
931 | ||
90572890 | 932 | static inline int cpupid_to_pid(int cpupid) |
b795854b MG |
933 | { |
934 | return -1; | |
935 | } | |
936 | ||
90572890 | 937 | static inline int cpupid_to_cpu(int cpupid) |
b795854b MG |
938 | { |
939 | return -1; | |
940 | } | |
941 | ||
90572890 PZ |
942 | static inline int cpu_pid_to_cpupid(int nid, int pid) |
943 | { | |
944 | return -1; | |
945 | } | |
946 | ||
947 | static inline bool cpupid_pid_unset(int cpupid) | |
b795854b MG |
948 | { |
949 | return 1; | |
950 | } | |
951 | ||
90572890 | 952 | static inline void page_cpupid_reset_last(struct page *page) |
57e0a030 MG |
953 | { |
954 | } | |
8c8a743c PZ |
955 | |
956 | static inline bool cpupid_match_pid(struct task_struct *task, int cpupid) | |
957 | { | |
958 | return false; | |
959 | } | |
90572890 | 960 | #endif /* CONFIG_NUMA_BALANCING */ |
57e0a030 | 961 | |
33dd4e0e | 962 | static inline struct zone *page_zone(const struct page *page) |
89689ae7 CL |
963 | { |
964 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; | |
965 | } | |
966 | ||
75ef7184 MG |
967 | static inline pg_data_t *page_pgdat(const struct page *page) |
968 | { | |
969 | return NODE_DATA(page_to_nid(page)); | |
970 | } | |
971 | ||
9127ab4f | 972 | #ifdef SECTION_IN_PAGE_FLAGS |
bf4e8902 DK |
973 | static inline void set_page_section(struct page *page, unsigned long section) |
974 | { | |
975 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); | |
976 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; | |
977 | } | |
978 | ||
aa462abe | 979 | static inline unsigned long page_to_section(const struct page *page) |
d41dee36 AW |
980 | { |
981 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; | |
982 | } | |
308c05e3 | 983 | #endif |
d41dee36 | 984 | |
2f1b6248 | 985 | static inline void set_page_zone(struct page *page, enum zone_type zone) |
348f8b6c DH |
986 | { |
987 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); | |
988 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; | |
989 | } | |
2f1b6248 | 990 | |
348f8b6c DH |
991 | static inline void set_page_node(struct page *page, unsigned long node) |
992 | { | |
993 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); | |
994 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; | |
1da177e4 | 995 | } |
89689ae7 | 996 | |
2f1b6248 | 997 | static inline void set_page_links(struct page *page, enum zone_type zone, |
d41dee36 | 998 | unsigned long node, unsigned long pfn) |
1da177e4 | 999 | { |
348f8b6c DH |
1000 | set_page_zone(page, zone); |
1001 | set_page_node(page, node); | |
9127ab4f | 1002 | #ifdef SECTION_IN_PAGE_FLAGS |
d41dee36 | 1003 | set_page_section(page, pfn_to_section_nr(pfn)); |
bf4e8902 | 1004 | #endif |
1da177e4 LT |
1005 | } |
1006 | ||
0610c25d GT |
1007 | #ifdef CONFIG_MEMCG |
1008 | static inline struct mem_cgroup *page_memcg(struct page *page) | |
1009 | { | |
1010 | return page->mem_cgroup; | |
1011 | } | |
55779ec7 JW |
1012 | static inline struct mem_cgroup *page_memcg_rcu(struct page *page) |
1013 | { | |
1014 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
1015 | return READ_ONCE(page->mem_cgroup); | |
1016 | } | |
0610c25d GT |
1017 | #else |
1018 | static inline struct mem_cgroup *page_memcg(struct page *page) | |
1019 | { | |
1020 | return NULL; | |
1021 | } | |
55779ec7 JW |
1022 | static inline struct mem_cgroup *page_memcg_rcu(struct page *page) |
1023 | { | |
1024 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
1025 | return NULL; | |
1026 | } | |
0610c25d GT |
1027 | #endif |
1028 | ||
f6ac2354 CL |
1029 | /* |
1030 | * Some inline functions in vmstat.h depend on page_zone() | |
1031 | */ | |
1032 | #include <linux/vmstat.h> | |
1033 | ||
33dd4e0e | 1034 | static __always_inline void *lowmem_page_address(const struct page *page) |
1da177e4 | 1035 | { |
1dff8083 | 1036 | return page_to_virt(page); |
1da177e4 LT |
1037 | } |
1038 | ||
1039 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) | |
1040 | #define HASHED_PAGE_VIRTUAL | |
1041 | #endif | |
1042 | ||
1043 | #if defined(WANT_PAGE_VIRTUAL) | |
f92f455f GU |
1044 | static inline void *page_address(const struct page *page) |
1045 | { | |
1046 | return page->virtual; | |
1047 | } | |
1048 | static inline void set_page_address(struct page *page, void *address) | |
1049 | { | |
1050 | page->virtual = address; | |
1051 | } | |
1da177e4 LT |
1052 | #define page_address_init() do { } while(0) |
1053 | #endif | |
1054 | ||
1055 | #if defined(HASHED_PAGE_VIRTUAL) | |
f9918794 | 1056 | void *page_address(const struct page *page); |
1da177e4 LT |
1057 | void set_page_address(struct page *page, void *virtual); |
1058 | void page_address_init(void); | |
1059 | #endif | |
1060 | ||
1061 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) | |
1062 | #define page_address(page) lowmem_page_address(page) | |
1063 | #define set_page_address(page, address) do { } while(0) | |
1064 | #define page_address_init() do { } while(0) | |
1065 | #endif | |
1066 | ||
e39155ea KS |
1067 | extern void *page_rmapping(struct page *page); |
1068 | extern struct anon_vma *page_anon_vma(struct page *page); | |
9800339b | 1069 | extern struct address_space *page_mapping(struct page *page); |
1da177e4 | 1070 | |
f981c595 MG |
1071 | extern struct address_space *__page_file_mapping(struct page *); |
1072 | ||
1073 | static inline | |
1074 | struct address_space *page_file_mapping(struct page *page) | |
1075 | { | |
1076 | if (unlikely(PageSwapCache(page))) | |
1077 | return __page_file_mapping(page); | |
1078 | ||
1079 | return page->mapping; | |
1080 | } | |
1081 | ||
f6ab1f7f HY |
1082 | extern pgoff_t __page_file_index(struct page *page); |
1083 | ||
1da177e4 LT |
1084 | /* |
1085 | * Return the pagecache index of the passed page. Regular pagecache pages | |
f6ab1f7f | 1086 | * use ->index whereas swapcache pages use swp_offset(->private) |
1da177e4 LT |
1087 | */ |
1088 | static inline pgoff_t page_index(struct page *page) | |
1089 | { | |
1090 | if (unlikely(PageSwapCache(page))) | |
f6ab1f7f | 1091 | return __page_file_index(page); |
1da177e4 LT |
1092 | return page->index; |
1093 | } | |
1094 | ||
1aa8aea5 | 1095 | bool page_mapped(struct page *page); |
bda807d4 | 1096 | struct address_space *page_mapping(struct page *page); |
1da177e4 | 1097 | |
2f064f34 MH |
1098 | /* |
1099 | * Return true only if the page has been allocated with | |
1100 | * ALLOC_NO_WATERMARKS and the low watermark was not | |
1101 | * met implying that the system is under some pressure. | |
1102 | */ | |
1103 | static inline bool page_is_pfmemalloc(struct page *page) | |
1104 | { | |
1105 | /* | |
1106 | * Page index cannot be this large so this must be | |
1107 | * a pfmemalloc page. | |
1108 | */ | |
1109 | return page->index == -1UL; | |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * Only to be called by the page allocator on a freshly allocated | |
1114 | * page. | |
1115 | */ | |
1116 | static inline void set_page_pfmemalloc(struct page *page) | |
1117 | { | |
1118 | page->index = -1UL; | |
1119 | } | |
1120 | ||
1121 | static inline void clear_page_pfmemalloc(struct page *page) | |
1122 | { | |
1123 | page->index = 0; | |
1124 | } | |
1125 | ||
1da177e4 LT |
1126 | /* |
1127 | * Different kinds of faults, as returned by handle_mm_fault(). | |
1128 | * Used to decide whether a process gets delivered SIGBUS or | |
1129 | * just gets major/minor fault counters bumped up. | |
1130 | */ | |
d0217ac0 | 1131 | |
83c54070 NP |
1132 | #define VM_FAULT_OOM 0x0001 |
1133 | #define VM_FAULT_SIGBUS 0x0002 | |
1134 | #define VM_FAULT_MAJOR 0x0004 | |
1135 | #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ | |
aa50d3a7 AK |
1136 | #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */ |
1137 | #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */ | |
33692f27 | 1138 | #define VM_FAULT_SIGSEGV 0x0040 |
f33ea7f4 | 1139 | |
83c54070 NP |
1140 | #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ |
1141 | #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ | |
d065bd81 | 1142 | #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */ |
c0292554 | 1143 | #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */ |
b1aa812b | 1144 | #define VM_FAULT_DONE_COW 0x1000 /* ->fault has fully handled COW */ |
1da177e4 | 1145 | |
aa50d3a7 AK |
1146 | #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */ |
1147 | ||
33692f27 LT |
1148 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \ |
1149 | VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \ | |
1150 | VM_FAULT_FALLBACK) | |
aa50d3a7 | 1151 | |
282a8e03 RZ |
1152 | #define VM_FAULT_RESULT_TRACE \ |
1153 | { VM_FAULT_OOM, "OOM" }, \ | |
1154 | { VM_FAULT_SIGBUS, "SIGBUS" }, \ | |
1155 | { VM_FAULT_MAJOR, "MAJOR" }, \ | |
1156 | { VM_FAULT_WRITE, "WRITE" }, \ | |
1157 | { VM_FAULT_HWPOISON, "HWPOISON" }, \ | |
1158 | { VM_FAULT_HWPOISON_LARGE, "HWPOISON_LARGE" }, \ | |
1159 | { VM_FAULT_SIGSEGV, "SIGSEGV" }, \ | |
1160 | { VM_FAULT_NOPAGE, "NOPAGE" }, \ | |
1161 | { VM_FAULT_LOCKED, "LOCKED" }, \ | |
1162 | { VM_FAULT_RETRY, "RETRY" }, \ | |
1163 | { VM_FAULT_FALLBACK, "FALLBACK" }, \ | |
1164 | { VM_FAULT_DONE_COW, "DONE_COW" } | |
1165 | ||
aa50d3a7 AK |
1166 | /* Encode hstate index for a hwpoisoned large page */ |
1167 | #define VM_FAULT_SET_HINDEX(x) ((x) << 12) | |
1168 | #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf) | |
d0217ac0 | 1169 | |
1c0fe6e3 NP |
1170 | /* |
1171 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. | |
1172 | */ | |
1173 | extern void pagefault_out_of_memory(void); | |
1174 | ||
1da177e4 LT |
1175 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
1176 | ||
ddd588b5 | 1177 | /* |
7bf02ea2 | 1178 | * Flags passed to show_mem() and show_free_areas() to suppress output in |
ddd588b5 DR |
1179 | * various contexts. |
1180 | */ | |
4b59e6c4 | 1181 | #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */ |
ddd588b5 | 1182 | |
9af744d7 | 1183 | extern void show_free_areas(unsigned int flags, nodemask_t *nodemask); |
1da177e4 | 1184 | |
7f43add4 | 1185 | extern bool can_do_mlock(void); |
1da177e4 LT |
1186 | extern int user_shm_lock(size_t, struct user_struct *); |
1187 | extern void user_shm_unlock(size_t, struct user_struct *); | |
1188 | ||
1189 | /* | |
1190 | * Parameter block passed down to zap_pte_range in exceptional cases. | |
1191 | */ | |
1192 | struct zap_details { | |
1da177e4 LT |
1193 | struct address_space *check_mapping; /* Check page->mapping if set */ |
1194 | pgoff_t first_index; /* Lowest page->index to unmap */ | |
1195 | pgoff_t last_index; /* Highest page->index to unmap */ | |
1da177e4 LT |
1196 | }; |
1197 | ||
7e675137 NP |
1198 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
1199 | pte_t pte); | |
28093f9f GS |
1200 | struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr, |
1201 | pmd_t pmd); | |
7e675137 | 1202 | |
c627f9cc JS |
1203 | int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
1204 | unsigned long size); | |
14f5ff5d | 1205 | void zap_page_range(struct vm_area_struct *vma, unsigned long address, |
ecf1385d | 1206 | unsigned long size); |
4f74d2c8 LT |
1207 | void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
1208 | unsigned long start, unsigned long end); | |
e6473092 MM |
1209 | |
1210 | /** | |
1211 | * mm_walk - callbacks for walk_page_range | |
a00cc7d9 MW |
1212 | * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry |
1213 | * this handler should only handle pud_trans_huge() puds. | |
1214 | * the pmd_entry or pte_entry callbacks will be used for | |
1215 | * regular PUDs. | |
e6473092 | 1216 | * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry |
03319327 DH |
1217 | * this handler is required to be able to handle |
1218 | * pmd_trans_huge() pmds. They may simply choose to | |
1219 | * split_huge_page() instead of handling it explicitly. | |
e6473092 MM |
1220 | * @pte_entry: if set, called for each non-empty PTE (4th-level) entry |
1221 | * @pte_hole: if set, called for each hole at all levels | |
5dc37642 | 1222 | * @hugetlb_entry: if set, called for each hugetlb entry |
fafaa426 | 1223 | * @test_walk: caller specific callback function to determine whether |
f7e2355f | 1224 | * we walk over the current vma or not. Returning 0 |
fafaa426 NH |
1225 | * value means "do page table walk over the current vma," |
1226 | * and a negative one means "abort current page table walk | |
f7e2355f | 1227 | * right now." 1 means "skip the current vma." |
fafaa426 NH |
1228 | * @mm: mm_struct representing the target process of page table walk |
1229 | * @vma: vma currently walked (NULL if walking outside vmas) | |
1230 | * @private: private data for callbacks' usage | |
e6473092 | 1231 | * |
fafaa426 | 1232 | * (see the comment on walk_page_range() for more details) |
e6473092 MM |
1233 | */ |
1234 | struct mm_walk { | |
a00cc7d9 MW |
1235 | int (*pud_entry)(pud_t *pud, unsigned long addr, |
1236 | unsigned long next, struct mm_walk *walk); | |
0f157a5b AM |
1237 | int (*pmd_entry)(pmd_t *pmd, unsigned long addr, |
1238 | unsigned long next, struct mm_walk *walk); | |
1239 | int (*pte_entry)(pte_t *pte, unsigned long addr, | |
1240 | unsigned long next, struct mm_walk *walk); | |
1241 | int (*pte_hole)(unsigned long addr, unsigned long next, | |
1242 | struct mm_walk *walk); | |
1243 | int (*hugetlb_entry)(pte_t *pte, unsigned long hmask, | |
1244 | unsigned long addr, unsigned long next, | |
1245 | struct mm_walk *walk); | |
fafaa426 NH |
1246 | int (*test_walk)(unsigned long addr, unsigned long next, |
1247 | struct mm_walk *walk); | |
2165009b | 1248 | struct mm_struct *mm; |
fafaa426 | 1249 | struct vm_area_struct *vma; |
2165009b | 1250 | void *private; |
e6473092 MM |
1251 | }; |
1252 | ||
2165009b DH |
1253 | int walk_page_range(unsigned long addr, unsigned long end, |
1254 | struct mm_walk *walk); | |
900fc5f1 | 1255 | int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk); |
42b77728 | 1256 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
3bf5ee95 | 1257 | unsigned long end, unsigned long floor, unsigned long ceiling); |
1da177e4 LT |
1258 | int copy_page_range(struct mm_struct *dst, struct mm_struct *src, |
1259 | struct vm_area_struct *vma); | |
1da177e4 LT |
1260 | void unmap_mapping_range(struct address_space *mapping, |
1261 | loff_t const holebegin, loff_t const holelen, int even_cows); | |
09796395 RZ |
1262 | int follow_pte_pmd(struct mm_struct *mm, unsigned long address, |
1263 | pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp); | |
3b6748e2 JW |
1264 | int follow_pfn(struct vm_area_struct *vma, unsigned long address, |
1265 | unsigned long *pfn); | |
d87fe660 | 1266 | int follow_phys(struct vm_area_struct *vma, unsigned long address, |
1267 | unsigned int flags, unsigned long *prot, resource_size_t *phys); | |
28b2ee20 RR |
1268 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
1269 | void *buf, int len, int write); | |
1da177e4 LT |
1270 | |
1271 | static inline void unmap_shared_mapping_range(struct address_space *mapping, | |
1272 | loff_t const holebegin, loff_t const holelen) | |
1273 | { | |
1274 | unmap_mapping_range(mapping, holebegin, holelen, 0); | |
1275 | } | |
1276 | ||
7caef267 | 1277 | extern void truncate_pagecache(struct inode *inode, loff_t new); |
2c27c65e | 1278 | extern void truncate_setsize(struct inode *inode, loff_t newsize); |
90a80202 | 1279 | void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to); |
623e3db9 | 1280 | void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end); |
750b4987 | 1281 | int truncate_inode_page(struct address_space *mapping, struct page *page); |
25718736 | 1282 | int generic_error_remove_page(struct address_space *mapping, struct page *page); |
83f78668 WF |
1283 | int invalidate_inode_page(struct page *page); |
1284 | ||
7ee1dd3f | 1285 | #ifdef CONFIG_MMU |
dcddffd4 KS |
1286 | extern int handle_mm_fault(struct vm_area_struct *vma, unsigned long address, |
1287 | unsigned int flags); | |
5c723ba5 | 1288 | extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, |
4a9e1cda DD |
1289 | unsigned long address, unsigned int fault_flags, |
1290 | bool *unlocked); | |
7ee1dd3f | 1291 | #else |
dcddffd4 KS |
1292 | static inline int handle_mm_fault(struct vm_area_struct *vma, |
1293 | unsigned long address, unsigned int flags) | |
7ee1dd3f DH |
1294 | { |
1295 | /* should never happen if there's no MMU */ | |
1296 | BUG(); | |
1297 | return VM_FAULT_SIGBUS; | |
1298 | } | |
5c723ba5 PZ |
1299 | static inline int fixup_user_fault(struct task_struct *tsk, |
1300 | struct mm_struct *mm, unsigned long address, | |
4a9e1cda | 1301 | unsigned int fault_flags, bool *unlocked) |
5c723ba5 PZ |
1302 | { |
1303 | /* should never happen if there's no MMU */ | |
1304 | BUG(); | |
1305 | return -EFAULT; | |
1306 | } | |
7ee1dd3f | 1307 | #endif |
f33ea7f4 | 1308 | |
f307ab6d LS |
1309 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, |
1310 | unsigned int gup_flags); | |
5ddd36b9 | 1311 | extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
6347e8d5 | 1312 | void *buf, int len, unsigned int gup_flags); |
84d77d3f EB |
1313 | extern int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, |
1314 | unsigned long addr, void *buf, int len, unsigned int gup_flags); | |
1da177e4 | 1315 | |
1e987790 DH |
1316 | long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm, |
1317 | unsigned long start, unsigned long nr_pages, | |
9beae1ea | 1318 | unsigned int gup_flags, struct page **pages, |
5b56d49f | 1319 | struct vm_area_struct **vmas, int *locked); |
c12d2da5 | 1320 | long get_user_pages(unsigned long start, unsigned long nr_pages, |
768ae309 | 1321 | unsigned int gup_flags, struct page **pages, |
cde70140 | 1322 | struct vm_area_struct **vmas); |
c12d2da5 | 1323 | long get_user_pages_locked(unsigned long start, unsigned long nr_pages, |
3b913179 | 1324 | unsigned int gup_flags, struct page **pages, int *locked); |
c12d2da5 | 1325 | long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages, |
c164154f | 1326 | struct page **pages, unsigned int gup_flags); |
d2bf6be8 NP |
1327 | int get_user_pages_fast(unsigned long start, int nr_pages, int write, |
1328 | struct page **pages); | |
8025e5dd JK |
1329 | |
1330 | /* Container for pinned pfns / pages */ | |
1331 | struct frame_vector { | |
1332 | unsigned int nr_allocated; /* Number of frames we have space for */ | |
1333 | unsigned int nr_frames; /* Number of frames stored in ptrs array */ | |
1334 | bool got_ref; /* Did we pin pages by getting page ref? */ | |
1335 | bool is_pfns; /* Does array contain pages or pfns? */ | |
1336 | void *ptrs[0]; /* Array of pinned pfns / pages. Use | |
1337 | * pfns_vector_pages() or pfns_vector_pfns() | |
1338 | * for access */ | |
1339 | }; | |
1340 | ||
1341 | struct frame_vector *frame_vector_create(unsigned int nr_frames); | |
1342 | void frame_vector_destroy(struct frame_vector *vec); | |
1343 | int get_vaddr_frames(unsigned long start, unsigned int nr_pfns, | |
7f23b350 | 1344 | unsigned int gup_flags, struct frame_vector *vec); |
8025e5dd JK |
1345 | void put_vaddr_frames(struct frame_vector *vec); |
1346 | int frame_vector_to_pages(struct frame_vector *vec); | |
1347 | void frame_vector_to_pfns(struct frame_vector *vec); | |
1348 | ||
1349 | static inline unsigned int frame_vector_count(struct frame_vector *vec) | |
1350 | { | |
1351 | return vec->nr_frames; | |
1352 | } | |
1353 | ||
1354 | static inline struct page **frame_vector_pages(struct frame_vector *vec) | |
1355 | { | |
1356 | if (vec->is_pfns) { | |
1357 | int err = frame_vector_to_pages(vec); | |
1358 | ||
1359 | if (err) | |
1360 | return ERR_PTR(err); | |
1361 | } | |
1362 | return (struct page **)(vec->ptrs); | |
1363 | } | |
1364 | ||
1365 | static inline unsigned long *frame_vector_pfns(struct frame_vector *vec) | |
1366 | { | |
1367 | if (!vec->is_pfns) | |
1368 | frame_vector_to_pfns(vec); | |
1369 | return (unsigned long *)(vec->ptrs); | |
1370 | } | |
1371 | ||
18022c5d MG |
1372 | struct kvec; |
1373 | int get_kernel_pages(const struct kvec *iov, int nr_pages, int write, | |
1374 | struct page **pages); | |
1375 | int get_kernel_page(unsigned long start, int write, struct page **pages); | |
f3e8fccd | 1376 | struct page *get_dump_page(unsigned long addr); |
1da177e4 | 1377 | |
cf9a2ae8 | 1378 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
d47992f8 LC |
1379 | extern void do_invalidatepage(struct page *page, unsigned int offset, |
1380 | unsigned int length); | |
cf9a2ae8 | 1381 | |
1da177e4 | 1382 | int __set_page_dirty_nobuffers(struct page *page); |
76719325 | 1383 | int __set_page_dirty_no_writeback(struct page *page); |
1da177e4 LT |
1384 | int redirty_page_for_writepage(struct writeback_control *wbc, |
1385 | struct page *page); | |
62cccb8c | 1386 | void account_page_dirtied(struct page *page, struct address_space *mapping); |
c4843a75 | 1387 | void account_page_cleaned(struct page *page, struct address_space *mapping, |
62cccb8c | 1388 | struct bdi_writeback *wb); |
b3c97528 | 1389 | int set_page_dirty(struct page *page); |
1da177e4 | 1390 | int set_page_dirty_lock(struct page *page); |
11f81bec | 1391 | void cancel_dirty_page(struct page *page); |
1da177e4 | 1392 | int clear_page_dirty_for_io(struct page *page); |
b9ea2515 | 1393 | |
a9090253 | 1394 | int get_cmdline(struct task_struct *task, char *buffer, int buflen); |
1da177e4 | 1395 | |
39aa3cb3 | 1396 | /* Is the vma a continuation of the stack vma above it? */ |
a09a79f6 | 1397 | static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr) |
39aa3cb3 SB |
1398 | { |
1399 | return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN); | |
1400 | } | |
1401 | ||
b5330628 ON |
1402 | static inline bool vma_is_anonymous(struct vm_area_struct *vma) |
1403 | { | |
1404 | return !vma->vm_ops; | |
1405 | } | |
1406 | ||
b0506e48 MR |
1407 | #ifdef CONFIG_SHMEM |
1408 | /* | |
1409 | * The vma_is_shmem is not inline because it is used only by slow | |
1410 | * paths in userfault. | |
1411 | */ | |
1412 | bool vma_is_shmem(struct vm_area_struct *vma); | |
1413 | #else | |
1414 | static inline bool vma_is_shmem(struct vm_area_struct *vma) { return false; } | |
1415 | #endif | |
1416 | ||
a09a79f6 MP |
1417 | static inline int stack_guard_page_start(struct vm_area_struct *vma, |
1418 | unsigned long addr) | |
1419 | { | |
1420 | return (vma->vm_flags & VM_GROWSDOWN) && | |
1421 | (vma->vm_start == addr) && | |
1422 | !vma_growsdown(vma->vm_prev, addr); | |
1423 | } | |
1424 | ||
1425 | /* Is the vma a continuation of the stack vma below it? */ | |
1426 | static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr) | |
1427 | { | |
1428 | return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP); | |
1429 | } | |
1430 | ||
1431 | static inline int stack_guard_page_end(struct vm_area_struct *vma, | |
1432 | unsigned long addr) | |
1433 | { | |
1434 | return (vma->vm_flags & VM_GROWSUP) && | |
1435 | (vma->vm_end == addr) && | |
1436 | !vma_growsup(vma->vm_next, addr); | |
1437 | } | |
1438 | ||
d17af505 | 1439 | int vma_is_stack_for_current(struct vm_area_struct *vma); |
b7643757 | 1440 | |
b6a2fea3 OW |
1441 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
1442 | unsigned long old_addr, struct vm_area_struct *new_vma, | |
38a76013 ML |
1443 | unsigned long new_addr, unsigned long len, |
1444 | bool need_rmap_locks); | |
7da4d641 PZ |
1445 | extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start, |
1446 | unsigned long end, pgprot_t newprot, | |
4b10e7d5 | 1447 | int dirty_accountable, int prot_numa); |
b6a2fea3 OW |
1448 | extern int mprotect_fixup(struct vm_area_struct *vma, |
1449 | struct vm_area_struct **pprev, unsigned long start, | |
1450 | unsigned long end, unsigned long newflags); | |
1da177e4 | 1451 | |
465a454f PZ |
1452 | /* |
1453 | * doesn't attempt to fault and will return short. | |
1454 | */ | |
1455 | int __get_user_pages_fast(unsigned long start, int nr_pages, int write, | |
1456 | struct page **pages); | |
d559db08 KH |
1457 | /* |
1458 | * per-process(per-mm_struct) statistics. | |
1459 | */ | |
d559db08 KH |
1460 | static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) |
1461 | { | |
69c97823 KK |
1462 | long val = atomic_long_read(&mm->rss_stat.count[member]); |
1463 | ||
1464 | #ifdef SPLIT_RSS_COUNTING | |
1465 | /* | |
1466 | * counter is updated in asynchronous manner and may go to minus. | |
1467 | * But it's never be expected number for users. | |
1468 | */ | |
1469 | if (val < 0) | |
1470 | val = 0; | |
172703b0 | 1471 | #endif |
69c97823 KK |
1472 | return (unsigned long)val; |
1473 | } | |
d559db08 KH |
1474 | |
1475 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) | |
1476 | { | |
172703b0 | 1477 | atomic_long_add(value, &mm->rss_stat.count[member]); |
d559db08 KH |
1478 | } |
1479 | ||
1480 | static inline void inc_mm_counter(struct mm_struct *mm, int member) | |
1481 | { | |
172703b0 | 1482 | atomic_long_inc(&mm->rss_stat.count[member]); |
d559db08 KH |
1483 | } |
1484 | ||
1485 | static inline void dec_mm_counter(struct mm_struct *mm, int member) | |
1486 | { | |
172703b0 | 1487 | atomic_long_dec(&mm->rss_stat.count[member]); |
d559db08 KH |
1488 | } |
1489 | ||
eca56ff9 JM |
1490 | /* Optimized variant when page is already known not to be PageAnon */ |
1491 | static inline int mm_counter_file(struct page *page) | |
1492 | { | |
1493 | if (PageSwapBacked(page)) | |
1494 | return MM_SHMEMPAGES; | |
1495 | return MM_FILEPAGES; | |
1496 | } | |
1497 | ||
1498 | static inline int mm_counter(struct page *page) | |
1499 | { | |
1500 | if (PageAnon(page)) | |
1501 | return MM_ANONPAGES; | |
1502 | return mm_counter_file(page); | |
1503 | } | |
1504 | ||
d559db08 KH |
1505 | static inline unsigned long get_mm_rss(struct mm_struct *mm) |
1506 | { | |
1507 | return get_mm_counter(mm, MM_FILEPAGES) + | |
eca56ff9 JM |
1508 | get_mm_counter(mm, MM_ANONPAGES) + |
1509 | get_mm_counter(mm, MM_SHMEMPAGES); | |
d559db08 KH |
1510 | } |
1511 | ||
1512 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) | |
1513 | { | |
1514 | return max(mm->hiwater_rss, get_mm_rss(mm)); | |
1515 | } | |
1516 | ||
1517 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) | |
1518 | { | |
1519 | return max(mm->hiwater_vm, mm->total_vm); | |
1520 | } | |
1521 | ||
1522 | static inline void update_hiwater_rss(struct mm_struct *mm) | |
1523 | { | |
1524 | unsigned long _rss = get_mm_rss(mm); | |
1525 | ||
1526 | if ((mm)->hiwater_rss < _rss) | |
1527 | (mm)->hiwater_rss = _rss; | |
1528 | } | |
1529 | ||
1530 | static inline void update_hiwater_vm(struct mm_struct *mm) | |
1531 | { | |
1532 | if (mm->hiwater_vm < mm->total_vm) | |
1533 | mm->hiwater_vm = mm->total_vm; | |
1534 | } | |
1535 | ||
695f0559 PC |
1536 | static inline void reset_mm_hiwater_rss(struct mm_struct *mm) |
1537 | { | |
1538 | mm->hiwater_rss = get_mm_rss(mm); | |
1539 | } | |
1540 | ||
d559db08 KH |
1541 | static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, |
1542 | struct mm_struct *mm) | |
1543 | { | |
1544 | unsigned long hiwater_rss = get_mm_hiwater_rss(mm); | |
1545 | ||
1546 | if (*maxrss < hiwater_rss) | |
1547 | *maxrss = hiwater_rss; | |
1548 | } | |
1549 | ||
53bddb4e | 1550 | #if defined(SPLIT_RSS_COUNTING) |
05af2e10 | 1551 | void sync_mm_rss(struct mm_struct *mm); |
53bddb4e | 1552 | #else |
05af2e10 | 1553 | static inline void sync_mm_rss(struct mm_struct *mm) |
53bddb4e KH |
1554 | { |
1555 | } | |
1556 | #endif | |
465a454f | 1557 | |
3565fce3 DW |
1558 | #ifndef __HAVE_ARCH_PTE_DEVMAP |
1559 | static inline int pte_devmap(pte_t pte) | |
1560 | { | |
1561 | return 0; | |
1562 | } | |
1563 | #endif | |
1564 | ||
6d2329f8 | 1565 | int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot); |
d08b3851 | 1566 | |
25ca1d6c NK |
1567 | extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr, |
1568 | spinlock_t **ptl); | |
1569 | static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, | |
1570 | spinlock_t **ptl) | |
1571 | { | |
1572 | pte_t *ptep; | |
1573 | __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl)); | |
1574 | return ptep; | |
1575 | } | |
c9cfcddf | 1576 | |
c2febafc KS |
1577 | #ifdef __PAGETABLE_P4D_FOLDED |
1578 | static inline int __p4d_alloc(struct mm_struct *mm, pgd_t *pgd, | |
1579 | unsigned long address) | |
1580 | { | |
1581 | return 0; | |
1582 | } | |
1583 | #else | |
1584 | int __p4d_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); | |
1585 | #endif | |
1586 | ||
5f22df00 | 1587 | #ifdef __PAGETABLE_PUD_FOLDED |
c2febafc | 1588 | static inline int __pud_alloc(struct mm_struct *mm, p4d_t *p4d, |
5f22df00 NP |
1589 | unsigned long address) |
1590 | { | |
1591 | return 0; | |
1592 | } | |
1593 | #else | |
c2febafc | 1594 | int __pud_alloc(struct mm_struct *mm, p4d_t *p4d, unsigned long address); |
5f22df00 NP |
1595 | #endif |
1596 | ||
2d2f5119 | 1597 | #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU) |
5f22df00 NP |
1598 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, |
1599 | unsigned long address) | |
1600 | { | |
1601 | return 0; | |
1602 | } | |
dc6c9a35 | 1603 | |
2d2f5119 KS |
1604 | static inline void mm_nr_pmds_init(struct mm_struct *mm) {} |
1605 | ||
dc6c9a35 KS |
1606 | static inline unsigned long mm_nr_pmds(struct mm_struct *mm) |
1607 | { | |
1608 | return 0; | |
1609 | } | |
1610 | ||
1611 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) {} | |
1612 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) {} | |
1613 | ||
5f22df00 | 1614 | #else |
1bb3630e | 1615 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
dc6c9a35 | 1616 | |
2d2f5119 KS |
1617 | static inline void mm_nr_pmds_init(struct mm_struct *mm) |
1618 | { | |
1619 | atomic_long_set(&mm->nr_pmds, 0); | |
1620 | } | |
1621 | ||
dc6c9a35 KS |
1622 | static inline unsigned long mm_nr_pmds(struct mm_struct *mm) |
1623 | { | |
1624 | return atomic_long_read(&mm->nr_pmds); | |
1625 | } | |
1626 | ||
1627 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) | |
1628 | { | |
1629 | atomic_long_inc(&mm->nr_pmds); | |
1630 | } | |
1631 | ||
1632 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) | |
1633 | { | |
1634 | atomic_long_dec(&mm->nr_pmds); | |
1635 | } | |
5f22df00 NP |
1636 | #endif |
1637 | ||
3ed3a4f0 | 1638 | int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address); |
1bb3630e HD |
1639 | int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); |
1640 | ||
1da177e4 LT |
1641 | /* |
1642 | * The following ifdef needed to get the 4level-fixup.h header to work. | |
1643 | * Remove it when 4level-fixup.h has been removed. | |
1644 | */ | |
1bb3630e | 1645 | #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) |
505a60e2 KS |
1646 | |
1647 | #ifndef __ARCH_HAS_5LEVEL_HACK | |
c2febafc KS |
1648 | static inline p4d_t *p4d_alloc(struct mm_struct *mm, pgd_t *pgd, |
1649 | unsigned long address) | |
1650 | { | |
1651 | return (unlikely(pgd_none(*pgd)) && __p4d_alloc(mm, pgd, address)) ? | |
1652 | NULL : p4d_offset(pgd, address); | |
1653 | } | |
1654 | ||
1655 | static inline pud_t *pud_alloc(struct mm_struct *mm, p4d_t *p4d, | |
1656 | unsigned long address) | |
1da177e4 | 1657 | { |
c2febafc KS |
1658 | return (unlikely(p4d_none(*p4d)) && __pud_alloc(mm, p4d, address)) ? |
1659 | NULL : pud_offset(p4d, address); | |
1da177e4 | 1660 | } |
505a60e2 | 1661 | #endif /* !__ARCH_HAS_5LEVEL_HACK */ |
1da177e4 LT |
1662 | |
1663 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) | |
1664 | { | |
1bb3630e HD |
1665 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
1666 | NULL: pmd_offset(pud, address); | |
1da177e4 | 1667 | } |
1bb3630e HD |
1668 | #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ |
1669 | ||
57c1ffce | 1670 | #if USE_SPLIT_PTE_PTLOCKS |
597d795a | 1671 | #if ALLOC_SPLIT_PTLOCKS |
b35f1819 | 1672 | void __init ptlock_cache_init(void); |
539edb58 PZ |
1673 | extern bool ptlock_alloc(struct page *page); |
1674 | extern void ptlock_free(struct page *page); | |
1675 | ||
1676 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
1677 | { | |
1678 | return page->ptl; | |
1679 | } | |
597d795a | 1680 | #else /* ALLOC_SPLIT_PTLOCKS */ |
b35f1819 KS |
1681 | static inline void ptlock_cache_init(void) |
1682 | { | |
1683 | } | |
1684 | ||
49076ec2 KS |
1685 | static inline bool ptlock_alloc(struct page *page) |
1686 | { | |
49076ec2 KS |
1687 | return true; |
1688 | } | |
539edb58 | 1689 | |
49076ec2 KS |
1690 | static inline void ptlock_free(struct page *page) |
1691 | { | |
49076ec2 KS |
1692 | } |
1693 | ||
1694 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
1695 | { | |
539edb58 | 1696 | return &page->ptl; |
49076ec2 | 1697 | } |
597d795a | 1698 | #endif /* ALLOC_SPLIT_PTLOCKS */ |
49076ec2 KS |
1699 | |
1700 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) | |
1701 | { | |
1702 | return ptlock_ptr(pmd_page(*pmd)); | |
1703 | } | |
1704 | ||
1705 | static inline bool ptlock_init(struct page *page) | |
1706 | { | |
1707 | /* | |
1708 | * prep_new_page() initialize page->private (and therefore page->ptl) | |
1709 | * with 0. Make sure nobody took it in use in between. | |
1710 | * | |
1711 | * It can happen if arch try to use slab for page table allocation: | |
1d798ca3 | 1712 | * slab code uses page->slab_cache, which share storage with page->ptl. |
49076ec2 | 1713 | */ |
309381fe | 1714 | VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page); |
49076ec2 KS |
1715 | if (!ptlock_alloc(page)) |
1716 | return false; | |
1717 | spin_lock_init(ptlock_ptr(page)); | |
1718 | return true; | |
1719 | } | |
1720 | ||
1721 | /* Reset page->mapping so free_pages_check won't complain. */ | |
1722 | static inline void pte_lock_deinit(struct page *page) | |
1723 | { | |
1724 | page->mapping = NULL; | |
1725 | ptlock_free(page); | |
1726 | } | |
1727 | ||
57c1ffce | 1728 | #else /* !USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 HD |
1729 | /* |
1730 | * We use mm->page_table_lock to guard all pagetable pages of the mm. | |
1731 | */ | |
49076ec2 KS |
1732 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1733 | { | |
1734 | return &mm->page_table_lock; | |
1735 | } | |
b35f1819 | 1736 | static inline void ptlock_cache_init(void) {} |
49076ec2 KS |
1737 | static inline bool ptlock_init(struct page *page) { return true; } |
1738 | static inline void pte_lock_deinit(struct page *page) {} | |
57c1ffce | 1739 | #endif /* USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 | 1740 | |
b35f1819 KS |
1741 | static inline void pgtable_init(void) |
1742 | { | |
1743 | ptlock_cache_init(); | |
1744 | pgtable_cache_init(); | |
1745 | } | |
1746 | ||
390f44e2 | 1747 | static inline bool pgtable_page_ctor(struct page *page) |
2f569afd | 1748 | { |
706874e9 VD |
1749 | if (!ptlock_init(page)) |
1750 | return false; | |
2f569afd | 1751 | inc_zone_page_state(page, NR_PAGETABLE); |
706874e9 | 1752 | return true; |
2f569afd MS |
1753 | } |
1754 | ||
1755 | static inline void pgtable_page_dtor(struct page *page) | |
1756 | { | |
1757 | pte_lock_deinit(page); | |
1758 | dec_zone_page_state(page, NR_PAGETABLE); | |
1759 | } | |
1760 | ||
c74df32c HD |
1761 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
1762 | ({ \ | |
4c21e2f2 | 1763 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
c74df32c HD |
1764 | pte_t *__pte = pte_offset_map(pmd, address); \ |
1765 | *(ptlp) = __ptl; \ | |
1766 | spin_lock(__ptl); \ | |
1767 | __pte; \ | |
1768 | }) | |
1769 | ||
1770 | #define pte_unmap_unlock(pte, ptl) do { \ | |
1771 | spin_unlock(ptl); \ | |
1772 | pte_unmap(pte); \ | |
1773 | } while (0) | |
1774 | ||
3ed3a4f0 KS |
1775 | #define pte_alloc(mm, pmd, address) \ |
1776 | (unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, pmd, address)) | |
1777 | ||
1778 | #define pte_alloc_map(mm, pmd, address) \ | |
1779 | (pte_alloc(mm, pmd, address) ? NULL : pte_offset_map(pmd, address)) | |
1bb3630e | 1780 | |
c74df32c | 1781 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
3ed3a4f0 KS |
1782 | (pte_alloc(mm, pmd, address) ? \ |
1783 | NULL : pte_offset_map_lock(mm, pmd, address, ptlp)) | |
c74df32c | 1784 | |
1bb3630e | 1785 | #define pte_alloc_kernel(pmd, address) \ |
8ac1f832 | 1786 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ |
1bb3630e | 1787 | NULL: pte_offset_kernel(pmd, address)) |
1da177e4 | 1788 | |
e009bb30 KS |
1789 | #if USE_SPLIT_PMD_PTLOCKS |
1790 | ||
634391ac MS |
1791 | static struct page *pmd_to_page(pmd_t *pmd) |
1792 | { | |
1793 | unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1); | |
1794 | return virt_to_page((void *)((unsigned long) pmd & mask)); | |
1795 | } | |
1796 | ||
e009bb30 KS |
1797 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1798 | { | |
634391ac | 1799 | return ptlock_ptr(pmd_to_page(pmd)); |
e009bb30 KS |
1800 | } |
1801 | ||
1802 | static inline bool pgtable_pmd_page_ctor(struct page *page) | |
1803 | { | |
e009bb30 KS |
1804 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1805 | page->pmd_huge_pte = NULL; | |
1806 | #endif | |
49076ec2 | 1807 | return ptlock_init(page); |
e009bb30 KS |
1808 | } |
1809 | ||
1810 | static inline void pgtable_pmd_page_dtor(struct page *page) | |
1811 | { | |
1812 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
309381fe | 1813 | VM_BUG_ON_PAGE(page->pmd_huge_pte, page); |
e009bb30 | 1814 | #endif |
49076ec2 | 1815 | ptlock_free(page); |
e009bb30 KS |
1816 | } |
1817 | ||
634391ac | 1818 | #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte) |
e009bb30 KS |
1819 | |
1820 | #else | |
1821 | ||
9a86cb7b KS |
1822 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1823 | { | |
1824 | return &mm->page_table_lock; | |
1825 | } | |
1826 | ||
e009bb30 KS |
1827 | static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; } |
1828 | static inline void pgtable_pmd_page_dtor(struct page *page) {} | |
1829 | ||
c389a250 | 1830 | #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) |
9a86cb7b | 1831 | |
e009bb30 KS |
1832 | #endif |
1833 | ||
9a86cb7b KS |
1834 | static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) |
1835 | { | |
1836 | spinlock_t *ptl = pmd_lockptr(mm, pmd); | |
1837 | spin_lock(ptl); | |
1838 | return ptl; | |
1839 | } | |
1840 | ||
a00cc7d9 MW |
1841 | /* |
1842 | * No scalability reason to split PUD locks yet, but follow the same pattern | |
1843 | * as the PMD locks to make it easier if we decide to. The VM should not be | |
1844 | * considered ready to switch to split PUD locks yet; there may be places | |
1845 | * which need to be converted from page_table_lock. | |
1846 | */ | |
1847 | static inline spinlock_t *pud_lockptr(struct mm_struct *mm, pud_t *pud) | |
1848 | { | |
1849 | return &mm->page_table_lock; | |
1850 | } | |
1851 | ||
1852 | static inline spinlock_t *pud_lock(struct mm_struct *mm, pud_t *pud) | |
1853 | { | |
1854 | spinlock_t *ptl = pud_lockptr(mm, pud); | |
1855 | ||
1856 | spin_lock(ptl); | |
1857 | return ptl; | |
1858 | } | |
62906027 | 1859 | |
a00cc7d9 | 1860 | extern void __init pagecache_init(void); |
1da177e4 | 1861 | extern void free_area_init(unsigned long * zones_size); |
9109fb7b JW |
1862 | extern void free_area_init_node(int nid, unsigned long * zones_size, |
1863 | unsigned long zone_start_pfn, unsigned long *zholes_size); | |
49a7f04a DH |
1864 | extern void free_initmem(void); |
1865 | ||
69afade7 JL |
1866 | /* |
1867 | * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) | |
1868 | * into the buddy system. The freed pages will be poisoned with pattern | |
dbe67df4 | 1869 | * "poison" if it's within range [0, UCHAR_MAX]. |
69afade7 JL |
1870 | * Return pages freed into the buddy system. |
1871 | */ | |
11199692 | 1872 | extern unsigned long free_reserved_area(void *start, void *end, |
69afade7 | 1873 | int poison, char *s); |
c3d5f5f0 | 1874 | |
cfa11e08 JL |
1875 | #ifdef CONFIG_HIGHMEM |
1876 | /* | |
1877 | * Free a highmem page into the buddy system, adjusting totalhigh_pages | |
1878 | * and totalram_pages. | |
1879 | */ | |
1880 | extern void free_highmem_page(struct page *page); | |
1881 | #endif | |
69afade7 | 1882 | |
c3d5f5f0 | 1883 | extern void adjust_managed_page_count(struct page *page, long count); |
7ee3d4e8 | 1884 | extern void mem_init_print_info(const char *str); |
69afade7 | 1885 | |
4b50bcc7 | 1886 | extern void reserve_bootmem_region(phys_addr_t start, phys_addr_t end); |
92923ca3 | 1887 | |
69afade7 JL |
1888 | /* Free the reserved page into the buddy system, so it gets managed. */ |
1889 | static inline void __free_reserved_page(struct page *page) | |
1890 | { | |
1891 | ClearPageReserved(page); | |
1892 | init_page_count(page); | |
1893 | __free_page(page); | |
1894 | } | |
1895 | ||
1896 | static inline void free_reserved_page(struct page *page) | |
1897 | { | |
1898 | __free_reserved_page(page); | |
1899 | adjust_managed_page_count(page, 1); | |
1900 | } | |
1901 | ||
1902 | static inline void mark_page_reserved(struct page *page) | |
1903 | { | |
1904 | SetPageReserved(page); | |
1905 | adjust_managed_page_count(page, -1); | |
1906 | } | |
1907 | ||
1908 | /* | |
1909 | * Default method to free all the __init memory into the buddy system. | |
dbe67df4 JL |
1910 | * The freed pages will be poisoned with pattern "poison" if it's within |
1911 | * range [0, UCHAR_MAX]. | |
1912 | * Return pages freed into the buddy system. | |
69afade7 JL |
1913 | */ |
1914 | static inline unsigned long free_initmem_default(int poison) | |
1915 | { | |
1916 | extern char __init_begin[], __init_end[]; | |
1917 | ||
11199692 | 1918 | return free_reserved_area(&__init_begin, &__init_end, |
69afade7 JL |
1919 | poison, "unused kernel"); |
1920 | } | |
1921 | ||
7ee3d4e8 JL |
1922 | static inline unsigned long get_num_physpages(void) |
1923 | { | |
1924 | int nid; | |
1925 | unsigned long phys_pages = 0; | |
1926 | ||
1927 | for_each_online_node(nid) | |
1928 | phys_pages += node_present_pages(nid); | |
1929 | ||
1930 | return phys_pages; | |
1931 | } | |
1932 | ||
0ee332c1 | 1933 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
c713216d | 1934 | /* |
0ee332c1 | 1935 | * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its |
c713216d MG |
1936 | * zones, allocate the backing mem_map and account for memory holes in a more |
1937 | * architecture independent manner. This is a substitute for creating the | |
1938 | * zone_sizes[] and zholes_size[] arrays and passing them to | |
1939 | * free_area_init_node() | |
1940 | * | |
1941 | * An architecture is expected to register range of page frames backed by | |
0ee332c1 | 1942 | * physical memory with memblock_add[_node]() before calling |
c713216d MG |
1943 | * free_area_init_nodes() passing in the PFN each zone ends at. At a basic |
1944 | * usage, an architecture is expected to do something like | |
1945 | * | |
1946 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, | |
1947 | * max_highmem_pfn}; | |
1948 | * for_each_valid_physical_page_range() | |
0ee332c1 | 1949 | * memblock_add_node(base, size, nid) |
c713216d MG |
1950 | * free_area_init_nodes(max_zone_pfns); |
1951 | * | |
0ee332c1 TH |
1952 | * free_bootmem_with_active_regions() calls free_bootmem_node() for each |
1953 | * registered physical page range. Similarly | |
1954 | * sparse_memory_present_with_active_regions() calls memory_present() for | |
1955 | * each range when SPARSEMEM is enabled. | |
c713216d MG |
1956 | * |
1957 | * See mm/page_alloc.c for more information on each function exposed by | |
0ee332c1 | 1958 | * CONFIG_HAVE_MEMBLOCK_NODE_MAP. |
c713216d MG |
1959 | */ |
1960 | extern void free_area_init_nodes(unsigned long *max_zone_pfn); | |
1e01979c | 1961 | unsigned long node_map_pfn_alignment(void); |
32996250 YL |
1962 | unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, |
1963 | unsigned long end_pfn); | |
c713216d MG |
1964 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
1965 | unsigned long end_pfn); | |
1966 | extern void get_pfn_range_for_nid(unsigned int nid, | |
1967 | unsigned long *start_pfn, unsigned long *end_pfn); | |
1968 | extern unsigned long find_min_pfn_with_active_regions(void); | |
c713216d MG |
1969 | extern void free_bootmem_with_active_regions(int nid, |
1970 | unsigned long max_low_pfn); | |
1971 | extern void sparse_memory_present_with_active_regions(int nid); | |
f2dbcfa7 | 1972 | |
0ee332c1 | 1973 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
f2dbcfa7 | 1974 | |
0ee332c1 | 1975 | #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \ |
f2dbcfa7 | 1976 | !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) |
8a942fde MG |
1977 | static inline int __early_pfn_to_nid(unsigned long pfn, |
1978 | struct mminit_pfnnid_cache *state) | |
f2dbcfa7 KH |
1979 | { |
1980 | return 0; | |
1981 | } | |
1982 | #else | |
1983 | /* please see mm/page_alloc.c */ | |
1984 | extern int __meminit early_pfn_to_nid(unsigned long pfn); | |
f2dbcfa7 | 1985 | /* there is a per-arch backend function. */ |
8a942fde MG |
1986 | extern int __meminit __early_pfn_to_nid(unsigned long pfn, |
1987 | struct mminit_pfnnid_cache *state); | |
f2dbcfa7 KH |
1988 | #endif |
1989 | ||
0e0b864e | 1990 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
a2f3aa02 DH |
1991 | extern void memmap_init_zone(unsigned long, int, unsigned long, |
1992 | unsigned long, enum memmap_context); | |
bc75d33f | 1993 | extern void setup_per_zone_wmarks(void); |
1b79acc9 | 1994 | extern int __meminit init_per_zone_wmark_min(void); |
1da177e4 | 1995 | extern void mem_init(void); |
8feae131 | 1996 | extern void __init mmap_init(void); |
9af744d7 | 1997 | extern void show_mem(unsigned int flags, nodemask_t *nodemask); |
d02bd27b | 1998 | extern long si_mem_available(void); |
1da177e4 LT |
1999 | extern void si_meminfo(struct sysinfo * val); |
2000 | extern void si_meminfo_node(struct sysinfo *val, int nid); | |
f6f34b43 SD |
2001 | #ifdef __HAVE_ARCH_RESERVED_KERNEL_PAGES |
2002 | extern unsigned long arch_reserved_kernel_pages(void); | |
2003 | #endif | |
1da177e4 | 2004 | |
a8e99259 MH |
2005 | extern __printf(3, 4) |
2006 | void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...); | |
a238ab5b | 2007 | |
e7c8d5c9 | 2008 | extern void setup_per_cpu_pageset(void); |
e7c8d5c9 | 2009 | |
112067f0 | 2010 | extern void zone_pcp_update(struct zone *zone); |
340175b7 | 2011 | extern void zone_pcp_reset(struct zone *zone); |
112067f0 | 2012 | |
75f7ad8e PS |
2013 | /* page_alloc.c */ |
2014 | extern int min_free_kbytes; | |
795ae7a0 | 2015 | extern int watermark_scale_factor; |
75f7ad8e | 2016 | |
8feae131 | 2017 | /* nommu.c */ |
33e5d769 | 2018 | extern atomic_long_t mmap_pages_allocated; |
7e660872 | 2019 | extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); |
8feae131 | 2020 | |
6b2dbba8 | 2021 | /* interval_tree.c */ |
6b2dbba8 ML |
2022 | void vma_interval_tree_insert(struct vm_area_struct *node, |
2023 | struct rb_root *root); | |
9826a516 ML |
2024 | void vma_interval_tree_insert_after(struct vm_area_struct *node, |
2025 | struct vm_area_struct *prev, | |
2026 | struct rb_root *root); | |
6b2dbba8 ML |
2027 | void vma_interval_tree_remove(struct vm_area_struct *node, |
2028 | struct rb_root *root); | |
2029 | struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root, | |
2030 | unsigned long start, unsigned long last); | |
2031 | struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node, | |
2032 | unsigned long start, unsigned long last); | |
2033 | ||
2034 | #define vma_interval_tree_foreach(vma, root, start, last) \ | |
2035 | for (vma = vma_interval_tree_iter_first(root, start, last); \ | |
2036 | vma; vma = vma_interval_tree_iter_next(vma, start, last)) | |
1da177e4 | 2037 | |
bf181b9f ML |
2038 | void anon_vma_interval_tree_insert(struct anon_vma_chain *node, |
2039 | struct rb_root *root); | |
2040 | void anon_vma_interval_tree_remove(struct anon_vma_chain *node, | |
2041 | struct rb_root *root); | |
2042 | struct anon_vma_chain *anon_vma_interval_tree_iter_first( | |
2043 | struct rb_root *root, unsigned long start, unsigned long last); | |
2044 | struct anon_vma_chain *anon_vma_interval_tree_iter_next( | |
2045 | struct anon_vma_chain *node, unsigned long start, unsigned long last); | |
ed8ea815 ML |
2046 | #ifdef CONFIG_DEBUG_VM_RB |
2047 | void anon_vma_interval_tree_verify(struct anon_vma_chain *node); | |
2048 | #endif | |
bf181b9f ML |
2049 | |
2050 | #define anon_vma_interval_tree_foreach(avc, root, start, last) \ | |
2051 | for (avc = anon_vma_interval_tree_iter_first(root, start, last); \ | |
2052 | avc; avc = anon_vma_interval_tree_iter_next(avc, start, last)) | |
2053 | ||
1da177e4 | 2054 | /* mmap.c */ |
34b4e4aa | 2055 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
e86f15ee AA |
2056 | extern int __vma_adjust(struct vm_area_struct *vma, unsigned long start, |
2057 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert, | |
2058 | struct vm_area_struct *expand); | |
2059 | static inline int vma_adjust(struct vm_area_struct *vma, unsigned long start, | |
2060 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert) | |
2061 | { | |
2062 | return __vma_adjust(vma, start, end, pgoff, insert, NULL); | |
2063 | } | |
1da177e4 LT |
2064 | extern struct vm_area_struct *vma_merge(struct mm_struct *, |
2065 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, | |
2066 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, | |
19a809af | 2067 | struct mempolicy *, struct vm_userfaultfd_ctx); |
1da177e4 | 2068 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); |
def5efe0 DR |
2069 | extern int __split_vma(struct mm_struct *, struct vm_area_struct *, |
2070 | unsigned long addr, int new_below); | |
2071 | extern int split_vma(struct mm_struct *, struct vm_area_struct *, | |
2072 | unsigned long addr, int new_below); | |
1da177e4 LT |
2073 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); |
2074 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, | |
2075 | struct rb_node **, struct rb_node *); | |
a8fb5618 | 2076 | extern void unlink_file_vma(struct vm_area_struct *); |
1da177e4 | 2077 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
38a76013 ML |
2078 | unsigned long addr, unsigned long len, pgoff_t pgoff, |
2079 | bool *need_rmap_locks); | |
1da177e4 | 2080 | extern void exit_mmap(struct mm_struct *); |
925d1c40 | 2081 | |
9c599024 CG |
2082 | static inline int check_data_rlimit(unsigned long rlim, |
2083 | unsigned long new, | |
2084 | unsigned long start, | |
2085 | unsigned long end_data, | |
2086 | unsigned long start_data) | |
2087 | { | |
2088 | if (rlim < RLIM_INFINITY) { | |
2089 | if (((new - start) + (end_data - start_data)) > rlim) | |
2090 | return -ENOSPC; | |
2091 | } | |
2092 | ||
2093 | return 0; | |
2094 | } | |
2095 | ||
7906d00c AA |
2096 | extern int mm_take_all_locks(struct mm_struct *mm); |
2097 | extern void mm_drop_all_locks(struct mm_struct *mm); | |
2098 | ||
38646013 JS |
2099 | extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
2100 | extern struct file *get_mm_exe_file(struct mm_struct *mm); | |
cd81a917 | 2101 | extern struct file *get_task_exe_file(struct task_struct *task); |
925d1c40 | 2102 | |
84638335 KK |
2103 | extern bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long npages); |
2104 | extern void vm_stat_account(struct mm_struct *, vm_flags_t, long npages); | |
2105 | ||
2eefd878 DS |
2106 | extern bool vma_is_special_mapping(const struct vm_area_struct *vma, |
2107 | const struct vm_special_mapping *sm); | |
3935ed6a SS |
2108 | extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm, |
2109 | unsigned long addr, unsigned long len, | |
a62c34bd AL |
2110 | unsigned long flags, |
2111 | const struct vm_special_mapping *spec); | |
2112 | /* This is an obsolete alternative to _install_special_mapping. */ | |
fa5dc22f RM |
2113 | extern int install_special_mapping(struct mm_struct *mm, |
2114 | unsigned long addr, unsigned long len, | |
2115 | unsigned long flags, struct page **pages); | |
1da177e4 LT |
2116 | |
2117 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
2118 | ||
0165ab44 | 2119 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
897ab3e0 MR |
2120 | unsigned long len, vm_flags_t vm_flags, unsigned long pgoff, |
2121 | struct list_head *uf); | |
1fcfd8db | 2122 | extern unsigned long do_mmap(struct file *file, unsigned long addr, |
bebeb3d6 | 2123 | unsigned long len, unsigned long prot, unsigned long flags, |
897ab3e0 MR |
2124 | vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate, |
2125 | struct list_head *uf); | |
2126 | extern int do_munmap(struct mm_struct *, unsigned long, size_t, | |
2127 | struct list_head *uf); | |
1da177e4 | 2128 | |
1fcfd8db ON |
2129 | static inline unsigned long |
2130 | do_mmap_pgoff(struct file *file, unsigned long addr, | |
2131 | unsigned long len, unsigned long prot, unsigned long flags, | |
897ab3e0 MR |
2132 | unsigned long pgoff, unsigned long *populate, |
2133 | struct list_head *uf) | |
1fcfd8db | 2134 | { |
897ab3e0 | 2135 | return do_mmap(file, addr, len, prot, flags, 0, pgoff, populate, uf); |
1fcfd8db ON |
2136 | } |
2137 | ||
bebeb3d6 ML |
2138 | #ifdef CONFIG_MMU |
2139 | extern int __mm_populate(unsigned long addr, unsigned long len, | |
2140 | int ignore_errors); | |
2141 | static inline void mm_populate(unsigned long addr, unsigned long len) | |
2142 | { | |
2143 | /* Ignore errors */ | |
2144 | (void) __mm_populate(addr, len, 1); | |
2145 | } | |
2146 | #else | |
2147 | static inline void mm_populate(unsigned long addr, unsigned long len) {} | |
2148 | #endif | |
2149 | ||
e4eb1ff6 | 2150 | /* These take the mm semaphore themselves */ |
5d22fc25 | 2151 | extern int __must_check vm_brk(unsigned long, unsigned long); |
16e72e9b | 2152 | extern int __must_check vm_brk_flags(unsigned long, unsigned long, unsigned long); |
bfce281c | 2153 | extern int vm_munmap(unsigned long, size_t); |
9fbeb5ab | 2154 | extern unsigned long __must_check vm_mmap(struct file *, unsigned long, |
6be5ceb0 LT |
2155 | unsigned long, unsigned long, |
2156 | unsigned long, unsigned long); | |
1da177e4 | 2157 | |
db4fbfb9 ML |
2158 | struct vm_unmapped_area_info { |
2159 | #define VM_UNMAPPED_AREA_TOPDOWN 1 | |
2160 | unsigned long flags; | |
2161 | unsigned long length; | |
2162 | unsigned long low_limit; | |
2163 | unsigned long high_limit; | |
2164 | unsigned long align_mask; | |
2165 | unsigned long align_offset; | |
2166 | }; | |
2167 | ||
2168 | extern unsigned long unmapped_area(struct vm_unmapped_area_info *info); | |
2169 | extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info); | |
2170 | ||
2171 | /* | |
2172 | * Search for an unmapped address range. | |
2173 | * | |
2174 | * We are looking for a range that: | |
2175 | * - does not intersect with any VMA; | |
2176 | * - is contained within the [low_limit, high_limit) interval; | |
2177 | * - is at least the desired size. | |
2178 | * - satisfies (begin_addr & align_mask) == (align_offset & align_mask) | |
2179 | */ | |
2180 | static inline unsigned long | |
2181 | vm_unmapped_area(struct vm_unmapped_area_info *info) | |
2182 | { | |
cdd7875e | 2183 | if (info->flags & VM_UNMAPPED_AREA_TOPDOWN) |
db4fbfb9 | 2184 | return unmapped_area_topdown(info); |
cdd7875e BP |
2185 | else |
2186 | return unmapped_area(info); | |
db4fbfb9 ML |
2187 | } |
2188 | ||
85821aab | 2189 | /* truncate.c */ |
1da177e4 | 2190 | extern void truncate_inode_pages(struct address_space *, loff_t); |
d7339071 HR |
2191 | extern void truncate_inode_pages_range(struct address_space *, |
2192 | loff_t lstart, loff_t lend); | |
91b0abe3 | 2193 | extern void truncate_inode_pages_final(struct address_space *); |
1da177e4 LT |
2194 | |
2195 | /* generic vm_area_ops exported for stackable file systems */ | |
11bac800 | 2196 | extern int filemap_fault(struct vm_fault *vmf); |
82b0f8c3 | 2197 | extern void filemap_map_pages(struct vm_fault *vmf, |
bae473a4 | 2198 | pgoff_t start_pgoff, pgoff_t end_pgoff); |
11bac800 | 2199 | extern int filemap_page_mkwrite(struct vm_fault *vmf); |
1da177e4 LT |
2200 | |
2201 | /* mm/page-writeback.c */ | |
2202 | int write_one_page(struct page *page, int wait); | |
1cf6e7d8 | 2203 | void task_dirty_inc(struct task_struct *tsk); |
1da177e4 LT |
2204 | |
2205 | /* readahead.c */ | |
2206 | #define VM_MAX_READAHEAD 128 /* kbytes */ | |
2207 | #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ | |
1da177e4 | 2208 | |
1da177e4 | 2209 | int force_page_cache_readahead(struct address_space *mapping, struct file *filp, |
7361f4d8 | 2210 | pgoff_t offset, unsigned long nr_to_read); |
cf914a7d RR |
2211 | |
2212 | void page_cache_sync_readahead(struct address_space *mapping, | |
2213 | struct file_ra_state *ra, | |
2214 | struct file *filp, | |
2215 | pgoff_t offset, | |
2216 | unsigned long size); | |
2217 | ||
2218 | void page_cache_async_readahead(struct address_space *mapping, | |
2219 | struct file_ra_state *ra, | |
2220 | struct file *filp, | |
2221 | struct page *pg, | |
2222 | pgoff_t offset, | |
2223 | unsigned long size); | |
2224 | ||
d05f3169 | 2225 | /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ |
46dea3d0 | 2226 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
d05f3169 MH |
2227 | |
2228 | /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */ | |
2229 | extern int expand_downwards(struct vm_area_struct *vma, | |
2230 | unsigned long address); | |
8ca3eb08 | 2231 | #if VM_GROWSUP |
46dea3d0 | 2232 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
8ca3eb08 | 2233 | #else |
fee7e49d | 2234 | #define expand_upwards(vma, address) (0) |
9ab88515 | 2235 | #endif |
1da177e4 LT |
2236 | |
2237 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ | |
2238 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); | |
2239 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, | |
2240 | struct vm_area_struct **pprev); | |
2241 | ||
2242 | /* Look up the first VMA which intersects the interval start_addr..end_addr-1, | |
2243 | NULL if none. Assume start_addr < end_addr. */ | |
2244 | static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) | |
2245 | { | |
2246 | struct vm_area_struct * vma = find_vma(mm,start_addr); | |
2247 | ||
2248 | if (vma && end_addr <= vma->vm_start) | |
2249 | vma = NULL; | |
2250 | return vma; | |
2251 | } | |
2252 | ||
2253 | static inline unsigned long vma_pages(struct vm_area_struct *vma) | |
2254 | { | |
2255 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
2256 | } | |
2257 | ||
640708a2 PE |
2258 | /* Look up the first VMA which exactly match the interval vm_start ... vm_end */ |
2259 | static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, | |
2260 | unsigned long vm_start, unsigned long vm_end) | |
2261 | { | |
2262 | struct vm_area_struct *vma = find_vma(mm, vm_start); | |
2263 | ||
2264 | if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end)) | |
2265 | vma = NULL; | |
2266 | ||
2267 | return vma; | |
2268 | } | |
2269 | ||
bad849b3 | 2270 | #ifdef CONFIG_MMU |
804af2cf | 2271 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
64e45507 | 2272 | void vma_set_page_prot(struct vm_area_struct *vma); |
bad849b3 DH |
2273 | #else |
2274 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) | |
2275 | { | |
2276 | return __pgprot(0); | |
2277 | } | |
64e45507 PF |
2278 | static inline void vma_set_page_prot(struct vm_area_struct *vma) |
2279 | { | |
2280 | vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); | |
2281 | } | |
bad849b3 DH |
2282 | #endif |
2283 | ||
5877231f | 2284 | #ifdef CONFIG_NUMA_BALANCING |
4b10e7d5 | 2285 | unsigned long change_prot_numa(struct vm_area_struct *vma, |
b24f53a0 LS |
2286 | unsigned long start, unsigned long end); |
2287 | #endif | |
2288 | ||
deceb6cd | 2289 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
deceb6cd HD |
2290 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
2291 | unsigned long pfn, unsigned long size, pgprot_t); | |
a145dd41 | 2292 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
e0dc0d8f NP |
2293 | int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
2294 | unsigned long pfn); | |
1745cbc5 AL |
2295 | int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr, |
2296 | unsigned long pfn, pgprot_t pgprot); | |
423bad60 | 2297 | int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
01c8f1c4 | 2298 | pfn_t pfn); |
b4cbb197 LT |
2299 | int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len); |
2300 | ||
deceb6cd | 2301 | |
240aadee ML |
2302 | struct page *follow_page_mask(struct vm_area_struct *vma, |
2303 | unsigned long address, unsigned int foll_flags, | |
2304 | unsigned int *page_mask); | |
2305 | ||
2306 | static inline struct page *follow_page(struct vm_area_struct *vma, | |
2307 | unsigned long address, unsigned int foll_flags) | |
2308 | { | |
2309 | unsigned int unused_page_mask; | |
2310 | return follow_page_mask(vma, address, foll_flags, &unused_page_mask); | |
2311 | } | |
2312 | ||
deceb6cd HD |
2313 | #define FOLL_WRITE 0x01 /* check pte is writable */ |
2314 | #define FOLL_TOUCH 0x02 /* mark page accessed */ | |
2315 | #define FOLL_GET 0x04 /* do get_page on page */ | |
8e4b9a60 | 2316 | #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ |
58fa879e | 2317 | #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ |
318b275f GN |
2318 | #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO |
2319 | * and return without waiting upon it */ | |
84d33df2 | 2320 | #define FOLL_POPULATE 0x40 /* fault in page */ |
500d65d4 | 2321 | #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */ |
69ebb83e | 2322 | #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */ |
0b9d7052 | 2323 | #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */ |
5117b3b8 | 2324 | #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */ |
234b239b | 2325 | #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */ |
de60f5f1 | 2326 | #define FOLL_MLOCK 0x1000 /* lock present pages */ |
1e987790 | 2327 | #define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */ |
19be0eaf | 2328 | #define FOLL_COW 0x4000 /* internal GUP flag */ |
1da177e4 | 2329 | |
2f569afd | 2330 | typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, |
aee16b3c JF |
2331 | void *data); |
2332 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, | |
2333 | unsigned long size, pte_fn_t fn, void *data); | |
2334 | ||
1da177e4 | 2335 | |
8823b1db LA |
2336 | #ifdef CONFIG_PAGE_POISONING |
2337 | extern bool page_poisoning_enabled(void); | |
2338 | extern void kernel_poison_pages(struct page *page, int numpages, int enable); | |
1414c7f4 | 2339 | extern bool page_is_poisoned(struct page *page); |
8823b1db LA |
2340 | #else |
2341 | static inline bool page_poisoning_enabled(void) { return false; } | |
2342 | static inline void kernel_poison_pages(struct page *page, int numpages, | |
2343 | int enable) { } | |
1414c7f4 | 2344 | static inline bool page_is_poisoned(struct page *page) { return false; } |
8823b1db LA |
2345 | #endif |
2346 | ||
12d6f21e | 2347 | #ifdef CONFIG_DEBUG_PAGEALLOC |
031bc574 JK |
2348 | extern bool _debug_pagealloc_enabled; |
2349 | extern void __kernel_map_pages(struct page *page, int numpages, int enable); | |
2350 | ||
2351 | static inline bool debug_pagealloc_enabled(void) | |
2352 | { | |
2353 | return _debug_pagealloc_enabled; | |
2354 | } | |
2355 | ||
2356 | static inline void | |
2357 | kernel_map_pages(struct page *page, int numpages, int enable) | |
2358 | { | |
2359 | if (!debug_pagealloc_enabled()) | |
2360 | return; | |
2361 | ||
2362 | __kernel_map_pages(page, numpages, enable); | |
2363 | } | |
8a235efa RW |
2364 | #ifdef CONFIG_HIBERNATION |
2365 | extern bool kernel_page_present(struct page *page); | |
40b44137 JK |
2366 | #endif /* CONFIG_HIBERNATION */ |
2367 | #else /* CONFIG_DEBUG_PAGEALLOC */ | |
1da177e4 | 2368 | static inline void |
9858db50 | 2369 | kernel_map_pages(struct page *page, int numpages, int enable) {} |
8a235efa RW |
2370 | #ifdef CONFIG_HIBERNATION |
2371 | static inline bool kernel_page_present(struct page *page) { return true; } | |
40b44137 JK |
2372 | #endif /* CONFIG_HIBERNATION */ |
2373 | static inline bool debug_pagealloc_enabled(void) | |
2374 | { | |
2375 | return false; | |
2376 | } | |
2377 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
1da177e4 | 2378 | |
a6c19dfe | 2379 | #ifdef __HAVE_ARCH_GATE_AREA |
31db58b3 | 2380 | extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); |
a6c19dfe AL |
2381 | extern int in_gate_area_no_mm(unsigned long addr); |
2382 | extern int in_gate_area(struct mm_struct *mm, unsigned long addr); | |
1da177e4 | 2383 | #else |
a6c19dfe AL |
2384 | static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
2385 | { | |
2386 | return NULL; | |
2387 | } | |
2388 | static inline int in_gate_area_no_mm(unsigned long addr) { return 0; } | |
2389 | static inline int in_gate_area(struct mm_struct *mm, unsigned long addr) | |
2390 | { | |
2391 | return 0; | |
2392 | } | |
1da177e4 LT |
2393 | #endif /* __HAVE_ARCH_GATE_AREA */ |
2394 | ||
44a70ade MH |
2395 | extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm); |
2396 | ||
146732ce JT |
2397 | #ifdef CONFIG_SYSCTL |
2398 | extern int sysctl_drop_caches; | |
8d65af78 | 2399 | int drop_caches_sysctl_handler(struct ctl_table *, int, |
9d0243bc | 2400 | void __user *, size_t *, loff_t *); |
146732ce JT |
2401 | #endif |
2402 | ||
cb731d6c VD |
2403 | void drop_slab(void); |
2404 | void drop_slab_node(int nid); | |
9d0243bc | 2405 | |
7a9166e3 LY |
2406 | #ifndef CONFIG_MMU |
2407 | #define randomize_va_space 0 | |
2408 | #else | |
a62eaf15 | 2409 | extern int randomize_va_space; |
7a9166e3 | 2410 | #endif |
a62eaf15 | 2411 | |
045e72ac | 2412 | const char * arch_vma_name(struct vm_area_struct *vma); |
03252919 | 2413 | void print_vma_addr(char *prefix, unsigned long rip); |
e6e5494c | 2414 | |
9bdac914 YL |
2415 | void sparse_mem_maps_populate_node(struct page **map_map, |
2416 | unsigned long pnum_begin, | |
2417 | unsigned long pnum_end, | |
2418 | unsigned long map_count, | |
2419 | int nodeid); | |
2420 | ||
98f3cfc1 | 2421 | struct page *sparse_mem_map_populate(unsigned long pnum, int nid); |
29c71111 | 2422 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
c2febafc KS |
2423 | p4d_t *vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node); |
2424 | pud_t *vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node); | |
29c71111 AW |
2425 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); |
2426 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node); | |
8f6aac41 | 2427 | void *vmemmap_alloc_block(unsigned long size, int node); |
4b94ffdc DW |
2428 | struct vmem_altmap; |
2429 | void *__vmemmap_alloc_block_buf(unsigned long size, int node, | |
2430 | struct vmem_altmap *altmap); | |
2431 | static inline void *vmemmap_alloc_block_buf(unsigned long size, int node) | |
2432 | { | |
2433 | return __vmemmap_alloc_block_buf(size, node, NULL); | |
2434 | } | |
2435 | ||
8f6aac41 | 2436 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
0aad818b JW |
2437 | int vmemmap_populate_basepages(unsigned long start, unsigned long end, |
2438 | int node); | |
2439 | int vmemmap_populate(unsigned long start, unsigned long end, int node); | |
c2b91e2e | 2440 | void vmemmap_populate_print_last(void); |
0197518c | 2441 | #ifdef CONFIG_MEMORY_HOTPLUG |
0aad818b | 2442 | void vmemmap_free(unsigned long start, unsigned long end); |
0197518c | 2443 | #endif |
46723bfa YI |
2444 | void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, |
2445 | unsigned long size); | |
6a46079c | 2446 | |
82ba011b AK |
2447 | enum mf_flags { |
2448 | MF_COUNT_INCREASED = 1 << 0, | |
7329bbeb | 2449 | MF_ACTION_REQUIRED = 1 << 1, |
6751ed65 | 2450 | MF_MUST_KILL = 1 << 2, |
cf870c70 | 2451 | MF_SOFT_OFFLINE = 1 << 3, |
82ba011b | 2452 | }; |
cd42f4a3 | 2453 | extern int memory_failure(unsigned long pfn, int trapno, int flags); |
ea8f5fb8 | 2454 | extern void memory_failure_queue(unsigned long pfn, int trapno, int flags); |
847ce401 | 2455 | extern int unpoison_memory(unsigned long pfn); |
ead07f6a | 2456 | extern int get_hwpoison_page(struct page *page); |
4e41a30c | 2457 | #define put_hwpoison_page(page) put_page(page) |
6a46079c AK |
2458 | extern int sysctl_memory_failure_early_kill; |
2459 | extern int sysctl_memory_failure_recovery; | |
facb6011 | 2460 | extern void shake_page(struct page *p, int access); |
293c07e3 | 2461 | extern atomic_long_t num_poisoned_pages; |
facb6011 | 2462 | extern int soft_offline_page(struct page *page, int flags); |
6a46079c | 2463 | |
cc637b17 XX |
2464 | |
2465 | /* | |
2466 | * Error handlers for various types of pages. | |
2467 | */ | |
cc3e2af4 | 2468 | enum mf_result { |
cc637b17 XX |
2469 | MF_IGNORED, /* Error: cannot be handled */ |
2470 | MF_FAILED, /* Error: handling failed */ | |
2471 | MF_DELAYED, /* Will be handled later */ | |
2472 | MF_RECOVERED, /* Successfully recovered */ | |
2473 | }; | |
2474 | ||
2475 | enum mf_action_page_type { | |
2476 | MF_MSG_KERNEL, | |
2477 | MF_MSG_KERNEL_HIGH_ORDER, | |
2478 | MF_MSG_SLAB, | |
2479 | MF_MSG_DIFFERENT_COMPOUND, | |
2480 | MF_MSG_POISONED_HUGE, | |
2481 | MF_MSG_HUGE, | |
2482 | MF_MSG_FREE_HUGE, | |
2483 | MF_MSG_UNMAP_FAILED, | |
2484 | MF_MSG_DIRTY_SWAPCACHE, | |
2485 | MF_MSG_CLEAN_SWAPCACHE, | |
2486 | MF_MSG_DIRTY_MLOCKED_LRU, | |
2487 | MF_MSG_CLEAN_MLOCKED_LRU, | |
2488 | MF_MSG_DIRTY_UNEVICTABLE_LRU, | |
2489 | MF_MSG_CLEAN_UNEVICTABLE_LRU, | |
2490 | MF_MSG_DIRTY_LRU, | |
2491 | MF_MSG_CLEAN_LRU, | |
2492 | MF_MSG_TRUNCATED_LRU, | |
2493 | MF_MSG_BUDDY, | |
2494 | MF_MSG_BUDDY_2ND, | |
2495 | MF_MSG_UNKNOWN, | |
2496 | }; | |
2497 | ||
47ad8475 AA |
2498 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) |
2499 | extern void clear_huge_page(struct page *page, | |
2500 | unsigned long addr, | |
2501 | unsigned int pages_per_huge_page); | |
2502 | extern void copy_user_huge_page(struct page *dst, struct page *src, | |
2503 | unsigned long addr, struct vm_area_struct *vma, | |
2504 | unsigned int pages_per_huge_page); | |
fa4d75c1 MK |
2505 | extern long copy_huge_page_from_user(struct page *dst_page, |
2506 | const void __user *usr_src, | |
810a56b9 MK |
2507 | unsigned int pages_per_huge_page, |
2508 | bool allow_pagefault); | |
47ad8475 AA |
2509 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ |
2510 | ||
e30825f1 | 2511 | extern struct page_ext_operations debug_guardpage_ops; |
e30825f1 | 2512 | |
c0a32fc5 SG |
2513 | #ifdef CONFIG_DEBUG_PAGEALLOC |
2514 | extern unsigned int _debug_guardpage_minorder; | |
e30825f1 | 2515 | extern bool _debug_guardpage_enabled; |
c0a32fc5 SG |
2516 | |
2517 | static inline unsigned int debug_guardpage_minorder(void) | |
2518 | { | |
2519 | return _debug_guardpage_minorder; | |
2520 | } | |
2521 | ||
e30825f1 JK |
2522 | static inline bool debug_guardpage_enabled(void) |
2523 | { | |
2524 | return _debug_guardpage_enabled; | |
2525 | } | |
2526 | ||
c0a32fc5 SG |
2527 | static inline bool page_is_guard(struct page *page) |
2528 | { | |
e30825f1 JK |
2529 | struct page_ext *page_ext; |
2530 | ||
2531 | if (!debug_guardpage_enabled()) | |
2532 | return false; | |
2533 | ||
2534 | page_ext = lookup_page_ext(page); | |
0bb2fd13 YS |
2535 | if (unlikely(!page_ext)) |
2536 | return false; | |
2537 | ||
e30825f1 | 2538 | return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); |
c0a32fc5 SG |
2539 | } |
2540 | #else | |
2541 | static inline unsigned int debug_guardpage_minorder(void) { return 0; } | |
e30825f1 | 2542 | static inline bool debug_guardpage_enabled(void) { return false; } |
c0a32fc5 SG |
2543 | static inline bool page_is_guard(struct page *page) { return false; } |
2544 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
2545 | ||
f9872caf CS |
2546 | #if MAX_NUMNODES > 1 |
2547 | void __init setup_nr_node_ids(void); | |
2548 | #else | |
2549 | static inline void setup_nr_node_ids(void) {} | |
2550 | #endif | |
2551 | ||
1da177e4 LT |
2552 | #endif /* __KERNEL__ */ |
2553 | #endif /* _LINUX_MM_H */ |