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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 | |
fccc9987 | 35 | #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */ |
1da177e4 | 36 | extern unsigned long max_mapnr; |
fccc9987 JL |
37 | |
38 | static inline void set_max_mapnr(unsigned long limit) | |
39 | { | |
40 | max_mapnr = limit; | |
41 | } | |
42 | #else | |
43 | static inline void set_max_mapnr(unsigned long limit) { } | |
1da177e4 LT |
44 | #endif |
45 | ||
4481374c | 46 | extern unsigned long totalram_pages; |
1da177e4 | 47 | extern void * high_memory; |
1da177e4 LT |
48 | extern int page_cluster; |
49 | ||
50 | #ifdef CONFIG_SYSCTL | |
51 | extern int sysctl_legacy_va_layout; | |
52 | #else | |
53 | #define sysctl_legacy_va_layout 0 | |
54 | #endif | |
55 | ||
d07e2259 DC |
56 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS |
57 | extern const int mmap_rnd_bits_min; | |
58 | extern const int mmap_rnd_bits_max; | |
59 | extern int mmap_rnd_bits __read_mostly; | |
60 | #endif | |
61 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS | |
62 | extern const int mmap_rnd_compat_bits_min; | |
63 | extern const int mmap_rnd_compat_bits_max; | |
64 | extern int mmap_rnd_compat_bits __read_mostly; | |
65 | #endif | |
66 | ||
1da177e4 LT |
67 | #include <asm/page.h> |
68 | #include <asm/pgtable.h> | |
69 | #include <asm/processor.h> | |
1da177e4 | 70 | |
79442ed1 TC |
71 | #ifndef __pa_symbol |
72 | #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) | |
73 | #endif | |
74 | ||
593befa6 DD |
75 | /* |
76 | * To prevent common memory management code establishing | |
77 | * a zero page mapping on a read fault. | |
78 | * This macro should be defined within <asm/pgtable.h>. | |
79 | * s390 does this to prevent multiplexing of hardware bits | |
80 | * related to the physical page in case of virtualization. | |
81 | */ | |
82 | #ifndef mm_forbids_zeropage | |
83 | #define mm_forbids_zeropage(X) (0) | |
84 | #endif | |
85 | ||
ea606cf5 AR |
86 | /* |
87 | * Default maximum number of active map areas, this limits the number of vmas | |
88 | * per mm struct. Users can overwrite this number by sysctl but there is a | |
89 | * problem. | |
90 | * | |
91 | * When a program's coredump is generated as ELF format, a section is created | |
92 | * per a vma. In ELF, the number of sections is represented in unsigned short. | |
93 | * This means the number of sections should be smaller than 65535 at coredump. | |
94 | * Because the kernel adds some informative sections to a image of program at | |
95 | * generating coredump, we need some margin. The number of extra sections is | |
96 | * 1-3 now and depends on arch. We use "5" as safe margin, here. | |
97 | * | |
98 | * ELF extended numbering allows more than 65535 sections, so 16-bit bound is | |
99 | * not a hard limit any more. Although some userspace tools can be surprised by | |
100 | * that. | |
101 | */ | |
102 | #define MAPCOUNT_ELF_CORE_MARGIN (5) | |
103 | #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) | |
104 | ||
105 | extern int sysctl_max_map_count; | |
106 | ||
c9b1d098 | 107 | extern unsigned long sysctl_user_reserve_kbytes; |
4eeab4f5 | 108 | extern unsigned long sysctl_admin_reserve_kbytes; |
c9b1d098 | 109 | |
49f0ce5f JM |
110 | extern int sysctl_overcommit_memory; |
111 | extern int sysctl_overcommit_ratio; | |
112 | extern unsigned long sysctl_overcommit_kbytes; | |
113 | ||
114 | extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *, | |
115 | size_t *, loff_t *); | |
116 | extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *, | |
117 | size_t *, loff_t *); | |
118 | ||
1da177e4 LT |
119 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
120 | ||
27ac792c AR |
121 | /* to align the pointer to the (next) page boundary */ |
122 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) | |
123 | ||
0fa73b86 AM |
124 | /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */ |
125 | #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE) | |
126 | ||
1da177e4 LT |
127 | /* |
128 | * Linux kernel virtual memory manager primitives. | |
129 | * The idea being to have a "virtual" mm in the same way | |
130 | * we have a virtual fs - giving a cleaner interface to the | |
131 | * mm details, and allowing different kinds of memory mappings | |
132 | * (from shared memory to executable loading to arbitrary | |
133 | * mmap() functions). | |
134 | */ | |
135 | ||
c43692e8 CL |
136 | extern struct kmem_cache *vm_area_cachep; |
137 | ||
1da177e4 | 138 | #ifndef CONFIG_MMU |
8feae131 DH |
139 | extern struct rb_root nommu_region_tree; |
140 | extern struct rw_semaphore nommu_region_sem; | |
1da177e4 LT |
141 | |
142 | extern unsigned int kobjsize(const void *objp); | |
143 | #endif | |
144 | ||
145 | /* | |
605d9288 | 146 | * vm_flags in vm_area_struct, see mm_types.h. |
bcf66917 | 147 | * When changing, update also include/trace/events/mmflags.h |
1da177e4 | 148 | */ |
cc2383ec KK |
149 | #define VM_NONE 0x00000000 |
150 | ||
1da177e4 LT |
151 | #define VM_READ 0x00000001 /* currently active flags */ |
152 | #define VM_WRITE 0x00000002 | |
153 | #define VM_EXEC 0x00000004 | |
154 | #define VM_SHARED 0x00000008 | |
155 | ||
7e2cff42 | 156 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
1da177e4 LT |
157 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
158 | #define VM_MAYWRITE 0x00000020 | |
159 | #define VM_MAYEXEC 0x00000040 | |
160 | #define VM_MAYSHARE 0x00000080 | |
161 | ||
162 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ | |
16ba6f81 | 163 | #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */ |
6aab341e | 164 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
1da177e4 | 165 | #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ |
16ba6f81 | 166 | #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */ |
1da177e4 | 167 | |
1da177e4 LT |
168 | #define VM_LOCKED 0x00002000 |
169 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ | |
170 | ||
171 | /* Used by sys_madvise() */ | |
172 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ | |
173 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ | |
174 | ||
175 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ | |
176 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ | |
de60f5f1 | 177 | #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */ |
1da177e4 | 178 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
cdfd4325 | 179 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
1da177e4 | 180 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
cc2383ec | 181 | #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ |
4aae7e43 | 182 | #define VM_ARCH_2 0x02000000 |
0103bd16 | 183 | #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */ |
d00806b1 | 184 | |
d9104d1c CG |
185 | #ifdef CONFIG_MEM_SOFT_DIRTY |
186 | # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */ | |
187 | #else | |
188 | # define VM_SOFTDIRTY 0 | |
189 | #endif | |
190 | ||
b379d790 | 191 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
cc2383ec KK |
192 | #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */ |
193 | #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ | |
f8af4da3 | 194 | #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ |
1da177e4 | 195 | |
63c17fb8 DH |
196 | #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS |
197 | #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */ | |
198 | #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */ | |
199 | #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */ | |
200 | #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */ | |
201 | #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0) | |
202 | #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1) | |
203 | #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2) | |
204 | #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3) | |
205 | #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */ | |
206 | ||
cc2383ec KK |
207 | #if defined(CONFIG_X86) |
208 | # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ | |
8f62c883 DH |
209 | #if defined (CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS) |
210 | # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0 | |
211 | # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */ | |
212 | # define VM_PKEY_BIT1 VM_HIGH_ARCH_1 | |
213 | # define VM_PKEY_BIT2 VM_HIGH_ARCH_2 | |
214 | # define VM_PKEY_BIT3 VM_HIGH_ARCH_3 | |
215 | #endif | |
cc2383ec KK |
216 | #elif defined(CONFIG_PPC) |
217 | # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */ | |
218 | #elif defined(CONFIG_PARISC) | |
219 | # define VM_GROWSUP VM_ARCH_1 | |
9ca52ed9 JH |
220 | #elif defined(CONFIG_METAG) |
221 | # define VM_GROWSUP VM_ARCH_1 | |
cc2383ec KK |
222 | #elif defined(CONFIG_IA64) |
223 | # define VM_GROWSUP VM_ARCH_1 | |
224 | #elif !defined(CONFIG_MMU) | |
225 | # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */ | |
226 | #endif | |
227 | ||
4aae7e43 QR |
228 | #if defined(CONFIG_X86) |
229 | /* MPX specific bounds table or bounds directory */ | |
230 | # define VM_MPX VM_ARCH_2 | |
231 | #endif | |
232 | ||
cc2383ec KK |
233 | #ifndef VM_GROWSUP |
234 | # define VM_GROWSUP VM_NONE | |
235 | #endif | |
236 | ||
a8bef8ff MG |
237 | /* Bits set in the VMA until the stack is in its final location */ |
238 | #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) | |
239 | ||
1da177e4 LT |
240 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
241 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS | |
242 | #endif | |
243 | ||
244 | #ifdef CONFIG_STACK_GROWSUP | |
30bdbb78 | 245 | #define VM_STACK VM_GROWSUP |
1da177e4 | 246 | #else |
30bdbb78 | 247 | #define VM_STACK VM_GROWSDOWN |
1da177e4 LT |
248 | #endif |
249 | ||
30bdbb78 KK |
250 | #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
251 | ||
b291f000 | 252 | /* |
78f11a25 AA |
253 | * Special vmas that are non-mergable, non-mlock()able. |
254 | * Note: mm/huge_memory.c VM_NO_THP depends on this definition. | |
b291f000 | 255 | */ |
9050d7eb | 256 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP) |
b291f000 | 257 | |
a0715cc2 AT |
258 | /* This mask defines which mm->def_flags a process can inherit its parent */ |
259 | #define VM_INIT_DEF_MASK VM_NOHUGEPAGE | |
260 | ||
de60f5f1 EM |
261 | /* This mask is used to clear all the VMA flags used by mlock */ |
262 | #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT)) | |
263 | ||
1da177e4 LT |
264 | /* |
265 | * mapping from the currently active vm_flags protection bits (the | |
266 | * low four bits) to a page protection mask.. | |
267 | */ | |
268 | extern pgprot_t protection_map[16]; | |
269 | ||
d0217ac0 | 270 | #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ |
9b4bdd2f KS |
271 | #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */ |
272 | #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */ | |
273 | #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */ | |
274 | #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */ | |
275 | #define FAULT_FLAG_TRIED 0x20 /* Second try */ | |
276 | #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */ | |
1b2ee126 | 277 | #define FAULT_FLAG_REMOTE 0x80 /* faulting for non current tsk/mm */ |
d61172b4 | 278 | #define FAULT_FLAG_INSTRUCTION 0x100 /* The fault was during an instruction fetch */ |
d0217ac0 | 279 | |
54cb8821 | 280 | /* |
d0217ac0 | 281 | * vm_fault is filled by the the pagefault handler and passed to the vma's |
83c54070 NP |
282 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
283 | * of VM_FAULT_xxx flags that give details about how the fault was handled. | |
54cb8821 | 284 | * |
c20cd45e MH |
285 | * MM layer fills up gfp_mask for page allocations but fault handler might |
286 | * alter it if its implementation requires a different allocation context. | |
287 | * | |
9b4bdd2f | 288 | * pgoff should be used in favour of virtual_address, if possible. |
54cb8821 | 289 | */ |
d0217ac0 NP |
290 | struct vm_fault { |
291 | unsigned int flags; /* FAULT_FLAG_xxx flags */ | |
c20cd45e | 292 | gfp_t gfp_mask; /* gfp mask to be used for allocations */ |
d0217ac0 NP |
293 | pgoff_t pgoff; /* Logical page offset based on vma */ |
294 | void __user *virtual_address; /* Faulting virtual address */ | |
295 | ||
2e4cdab0 | 296 | struct page *cow_page; /* Handler may choose to COW */ |
d0217ac0 | 297 | struct page *page; /* ->fault handlers should return a |
83c54070 | 298 | * page here, unless VM_FAULT_NOPAGE |
d0217ac0 | 299 | * is set (which is also implied by |
83c54070 | 300 | * VM_FAULT_ERROR). |
d0217ac0 | 301 | */ |
8c6e50b0 KS |
302 | /* for ->map_pages() only */ |
303 | pgoff_t max_pgoff; /* map pages for offset from pgoff till | |
304 | * max_pgoff inclusive */ | |
305 | pte_t *pte; /* pte entry associated with ->pgoff */ | |
54cb8821 | 306 | }; |
1da177e4 LT |
307 | |
308 | /* | |
309 | * These are the virtual MM functions - opening of an area, closing and | |
310 | * unmapping it (needed to keep files on disk up-to-date etc), pointer | |
311 | * to the functions called when a no-page or a wp-page exception occurs. | |
312 | */ | |
313 | struct vm_operations_struct { | |
314 | void (*open)(struct vm_area_struct * area); | |
315 | void (*close)(struct vm_area_struct * area); | |
5477e70a | 316 | int (*mremap)(struct vm_area_struct * area); |
d0217ac0 | 317 | int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); |
b96375f7 MW |
318 | int (*pmd_fault)(struct vm_area_struct *, unsigned long address, |
319 | pmd_t *, unsigned int flags); | |
8c6e50b0 | 320 | void (*map_pages)(struct vm_area_struct *vma, struct vm_fault *vmf); |
9637a5ef DH |
321 | |
322 | /* notification that a previously read-only page is about to become | |
323 | * writable, if an error is returned it will cause a SIGBUS */ | |
c2ec175c | 324 | int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); |
28b2ee20 | 325 | |
dd906184 BH |
326 | /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */ |
327 | int (*pfn_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); | |
328 | ||
28b2ee20 RR |
329 | /* called by access_process_vm when get_user_pages() fails, typically |
330 | * for use by special VMAs that can switch between memory and hardware | |
331 | */ | |
332 | int (*access)(struct vm_area_struct *vma, unsigned long addr, | |
333 | void *buf, int len, int write); | |
78d683e8 AL |
334 | |
335 | /* Called by the /proc/PID/maps code to ask the vma whether it | |
336 | * has a special name. Returning non-NULL will also cause this | |
337 | * vma to be dumped unconditionally. */ | |
338 | const char *(*name)(struct vm_area_struct *vma); | |
339 | ||
1da177e4 | 340 | #ifdef CONFIG_NUMA |
a6020ed7 LS |
341 | /* |
342 | * set_policy() op must add a reference to any non-NULL @new mempolicy | |
343 | * to hold the policy upon return. Caller should pass NULL @new to | |
344 | * remove a policy and fall back to surrounding context--i.e. do not | |
345 | * install a MPOL_DEFAULT policy, nor the task or system default | |
346 | * mempolicy. | |
347 | */ | |
1da177e4 | 348 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
a6020ed7 LS |
349 | |
350 | /* | |
351 | * get_policy() op must add reference [mpol_get()] to any policy at | |
352 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure | |
353 | * in mm/mempolicy.c will do this automatically. | |
354 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not | |
355 | * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. | |
356 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op | |
357 | * must return NULL--i.e., do not "fallback" to task or system default | |
358 | * policy. | |
359 | */ | |
1da177e4 LT |
360 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
361 | unsigned long addr); | |
362 | #endif | |
667a0a06 DV |
363 | /* |
364 | * Called by vm_normal_page() for special PTEs to find the | |
365 | * page for @addr. This is useful if the default behavior | |
366 | * (using pte_page()) would not find the correct page. | |
367 | */ | |
368 | struct page *(*find_special_page)(struct vm_area_struct *vma, | |
369 | unsigned long addr); | |
1da177e4 LT |
370 | }; |
371 | ||
372 | struct mmu_gather; | |
373 | struct inode; | |
374 | ||
349aef0b AM |
375 | #define page_private(page) ((page)->private) |
376 | #define set_page_private(page, v) ((page)->private = (v)) | |
4c21e2f2 | 377 | |
5c7fb56e DW |
378 | #if !defined(__HAVE_ARCH_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE) |
379 | static inline int pmd_devmap(pmd_t pmd) | |
380 | { | |
381 | return 0; | |
382 | } | |
383 | #endif | |
384 | ||
1da177e4 LT |
385 | /* |
386 | * FIXME: take this include out, include page-flags.h in | |
387 | * files which need it (119 of them) | |
388 | */ | |
389 | #include <linux/page-flags.h> | |
71e3aac0 | 390 | #include <linux/huge_mm.h> |
1da177e4 LT |
391 | |
392 | /* | |
393 | * Methods to modify the page usage count. | |
394 | * | |
395 | * What counts for a page usage: | |
396 | * - cache mapping (page->mapping) | |
397 | * - private data (page->private) | |
398 | * - page mapped in a task's page tables, each mapping | |
399 | * is counted separately | |
400 | * | |
401 | * Also, many kernel routines increase the page count before a critical | |
402 | * routine so they can be sure the page doesn't go away from under them. | |
1da177e4 LT |
403 | */ |
404 | ||
405 | /* | |
da6052f7 | 406 | * Drop a ref, return true if the refcount fell to zero (the page has no users) |
1da177e4 | 407 | */ |
7c8ee9a8 NP |
408 | static inline int put_page_testzero(struct page *page) |
409 | { | |
fe896d18 JK |
410 | VM_BUG_ON_PAGE(page_ref_count(page) == 0, page); |
411 | return page_ref_dec_and_test(page); | |
7c8ee9a8 | 412 | } |
1da177e4 LT |
413 | |
414 | /* | |
7c8ee9a8 NP |
415 | * Try to grab a ref unless the page has a refcount of zero, return false if |
416 | * that is the case. | |
8e0861fa AK |
417 | * This can be called when MMU is off so it must not access |
418 | * any of the virtual mappings. | |
1da177e4 | 419 | */ |
7c8ee9a8 NP |
420 | static inline int get_page_unless_zero(struct page *page) |
421 | { | |
fe896d18 | 422 | return page_ref_add_unless(page, 1, 0); |
7c8ee9a8 | 423 | } |
1da177e4 | 424 | |
53df8fdc | 425 | extern int page_is_ram(unsigned long pfn); |
124fe20d DW |
426 | |
427 | enum { | |
428 | REGION_INTERSECTS, | |
429 | REGION_DISJOINT, | |
430 | REGION_MIXED, | |
431 | }; | |
432 | ||
1c29f25b TK |
433 | int region_intersects(resource_size_t offset, size_t size, unsigned long flags, |
434 | unsigned long desc); | |
53df8fdc | 435 | |
48667e7a | 436 | /* Support for virtually mapped pages */ |
b3bdda02 CL |
437 | struct page *vmalloc_to_page(const void *addr); |
438 | unsigned long vmalloc_to_pfn(const void *addr); | |
48667e7a | 439 | |
0738c4bb PM |
440 | /* |
441 | * Determine if an address is within the vmalloc range | |
442 | * | |
443 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there | |
444 | * is no special casing required. | |
445 | */ | |
9e2779fa CL |
446 | static inline int is_vmalloc_addr(const void *x) |
447 | { | |
0738c4bb | 448 | #ifdef CONFIG_MMU |
9e2779fa CL |
449 | unsigned long addr = (unsigned long)x; |
450 | ||
451 | return addr >= VMALLOC_START && addr < VMALLOC_END; | |
0738c4bb PM |
452 | #else |
453 | return 0; | |
8ca3ed87 | 454 | #endif |
0738c4bb | 455 | } |
81ac3ad9 KH |
456 | #ifdef CONFIG_MMU |
457 | extern int is_vmalloc_or_module_addr(const void *x); | |
458 | #else | |
934831d0 | 459 | static inline int is_vmalloc_or_module_addr(const void *x) |
81ac3ad9 KH |
460 | { |
461 | return 0; | |
462 | } | |
463 | #endif | |
9e2779fa | 464 | |
39f1f78d AV |
465 | extern void kvfree(const void *addr); |
466 | ||
53f9263b KS |
467 | static inline atomic_t *compound_mapcount_ptr(struct page *page) |
468 | { | |
469 | return &page[1].compound_mapcount; | |
470 | } | |
471 | ||
472 | static inline int compound_mapcount(struct page *page) | |
473 | { | |
474 | if (!PageCompound(page)) | |
475 | return 0; | |
476 | page = compound_head(page); | |
477 | return atomic_read(compound_mapcount_ptr(page)) + 1; | |
478 | } | |
479 | ||
70b50f94 AA |
480 | /* |
481 | * The atomic page->_mapcount, starts from -1: so that transitions | |
482 | * both from it and to it can be tracked, using atomic_inc_and_test | |
483 | * and atomic_add_negative(-1). | |
484 | */ | |
22b751c3 | 485 | static inline void page_mapcount_reset(struct page *page) |
70b50f94 AA |
486 | { |
487 | atomic_set(&(page)->_mapcount, -1); | |
488 | } | |
489 | ||
b20ce5e0 KS |
490 | int __page_mapcount(struct page *page); |
491 | ||
70b50f94 AA |
492 | static inline int page_mapcount(struct page *page) |
493 | { | |
1d148e21 | 494 | VM_BUG_ON_PAGE(PageSlab(page), page); |
53f9263b | 495 | |
b20ce5e0 KS |
496 | if (unlikely(PageCompound(page))) |
497 | return __page_mapcount(page); | |
498 | return atomic_read(&page->_mapcount) + 1; | |
499 | } | |
500 | ||
501 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
502 | int total_mapcount(struct page *page); | |
6d0a07ed | 503 | int page_trans_huge_mapcount(struct page *page, int *total_mapcount); |
b20ce5e0 KS |
504 | #else |
505 | static inline int total_mapcount(struct page *page) | |
506 | { | |
507 | return page_mapcount(page); | |
70b50f94 | 508 | } |
6d0a07ed AA |
509 | static inline int page_trans_huge_mapcount(struct page *page, |
510 | int *total_mapcount) | |
511 | { | |
512 | int mapcount = page_mapcount(page); | |
513 | if (total_mapcount) | |
514 | *total_mapcount = mapcount; | |
515 | return mapcount; | |
516 | } | |
b20ce5e0 | 517 | #endif |
70b50f94 | 518 | |
b49af68f CL |
519 | static inline struct page *virt_to_head_page(const void *x) |
520 | { | |
521 | struct page *page = virt_to_page(x); | |
ccaafd7f | 522 | |
1d798ca3 | 523 | return compound_head(page); |
b49af68f CL |
524 | } |
525 | ||
ddc58f27 KS |
526 | void __put_page(struct page *page); |
527 | ||
1d7ea732 | 528 | void put_pages_list(struct list_head *pages); |
1da177e4 | 529 | |
8dfcc9ba | 530 | void split_page(struct page *page, unsigned int order); |
748446bb | 531 | int split_free_page(struct page *page); |
8dfcc9ba | 532 | |
33f2ef89 AW |
533 | /* |
534 | * Compound pages have a destructor function. Provide a | |
535 | * prototype for that function and accessor functions. | |
f1e61557 | 536 | * These are _only_ valid on the head of a compound page. |
33f2ef89 | 537 | */ |
f1e61557 KS |
538 | typedef void compound_page_dtor(struct page *); |
539 | ||
540 | /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */ | |
541 | enum compound_dtor_id { | |
542 | NULL_COMPOUND_DTOR, | |
543 | COMPOUND_PAGE_DTOR, | |
544 | #ifdef CONFIG_HUGETLB_PAGE | |
545 | HUGETLB_PAGE_DTOR, | |
9a982250 KS |
546 | #endif |
547 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
548 | TRANSHUGE_PAGE_DTOR, | |
f1e61557 KS |
549 | #endif |
550 | NR_COMPOUND_DTORS, | |
551 | }; | |
552 | extern compound_page_dtor * const compound_page_dtors[]; | |
33f2ef89 AW |
553 | |
554 | static inline void set_compound_page_dtor(struct page *page, | |
f1e61557 | 555 | enum compound_dtor_id compound_dtor) |
33f2ef89 | 556 | { |
f1e61557 KS |
557 | VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page); |
558 | page[1].compound_dtor = compound_dtor; | |
33f2ef89 AW |
559 | } |
560 | ||
561 | static inline compound_page_dtor *get_compound_page_dtor(struct page *page) | |
562 | { | |
f1e61557 KS |
563 | VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page); |
564 | return compound_page_dtors[page[1].compound_dtor]; | |
33f2ef89 AW |
565 | } |
566 | ||
d00181b9 | 567 | static inline unsigned int compound_order(struct page *page) |
d85f3385 | 568 | { |
6d777953 | 569 | if (!PageHead(page)) |
d85f3385 | 570 | return 0; |
e4b294c2 | 571 | return page[1].compound_order; |
d85f3385 CL |
572 | } |
573 | ||
f1e61557 | 574 | static inline void set_compound_order(struct page *page, unsigned int order) |
d85f3385 | 575 | { |
e4b294c2 | 576 | page[1].compound_order = order; |
d85f3385 CL |
577 | } |
578 | ||
9a982250 KS |
579 | void free_compound_page(struct page *page); |
580 | ||
3dece370 | 581 | #ifdef CONFIG_MMU |
14fd403f AA |
582 | /* |
583 | * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when | |
584 | * servicing faults for write access. In the normal case, do always want | |
585 | * pte_mkwrite. But get_user_pages can cause write faults for mappings | |
586 | * that do not have writing enabled, when used by access_process_vm. | |
587 | */ | |
588 | static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) | |
589 | { | |
590 | if (likely(vma->vm_flags & VM_WRITE)) | |
591 | pte = pte_mkwrite(pte); | |
592 | return pte; | |
593 | } | |
8c6e50b0 KS |
594 | |
595 | void do_set_pte(struct vm_area_struct *vma, unsigned long address, | |
596 | struct page *page, pte_t *pte, bool write, bool anon); | |
3dece370 | 597 | #endif |
14fd403f | 598 | |
1da177e4 LT |
599 | /* |
600 | * Multiple processes may "see" the same page. E.g. for untouched | |
601 | * mappings of /dev/null, all processes see the same page full of | |
602 | * zeroes, and text pages of executables and shared libraries have | |
603 | * only one copy in memory, at most, normally. | |
604 | * | |
605 | * For the non-reserved pages, page_count(page) denotes a reference count. | |
7e871b6c PBG |
606 | * page_count() == 0 means the page is free. page->lru is then used for |
607 | * freelist management in the buddy allocator. | |
da6052f7 | 608 | * page_count() > 0 means the page has been allocated. |
1da177e4 | 609 | * |
da6052f7 NP |
610 | * Pages are allocated by the slab allocator in order to provide memory |
611 | * to kmalloc and kmem_cache_alloc. In this case, the management of the | |
612 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c | |
613 | * unless a particular usage is carefully commented. (the responsibility of | |
614 | * freeing the kmalloc memory is the caller's, of course). | |
1da177e4 | 615 | * |
da6052f7 NP |
616 | * A page may be used by anyone else who does a __get_free_page(). |
617 | * In this case, page_count still tracks the references, and should only | |
618 | * be used through the normal accessor functions. The top bits of page->flags | |
619 | * and page->virtual store page management information, but all other fields | |
620 | * are unused and could be used privately, carefully. The management of this | |
621 | * page is the responsibility of the one who allocated it, and those who have | |
622 | * subsequently been given references to it. | |
623 | * | |
624 | * The other pages (we may call them "pagecache pages") are completely | |
1da177e4 LT |
625 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
626 | * The following discussion applies only to them. | |
627 | * | |
da6052f7 NP |
628 | * A pagecache page contains an opaque `private' member, which belongs to the |
629 | * page's address_space. Usually, this is the address of a circular list of | |
630 | * the page's disk buffers. PG_private must be set to tell the VM to call | |
631 | * into the filesystem to release these pages. | |
1da177e4 | 632 | * |
da6052f7 NP |
633 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
634 | * is the pointer to the inode, and page->index is the file offset of the page, | |
ea1754a0 | 635 | * in units of PAGE_SIZE. |
1da177e4 | 636 | * |
da6052f7 NP |
637 | * If pagecache pages are not associated with an inode, they are said to be |
638 | * anonymous pages. These may become associated with the swapcache, and in that | |
639 | * case PG_swapcache is set, and page->private is an offset into the swapcache. | |
1da177e4 | 640 | * |
da6052f7 NP |
641 | * In either case (swapcache or inode backed), the pagecache itself holds one |
642 | * reference to the page. Setting PG_private should also increment the | |
643 | * refcount. The each user mapping also has a reference to the page. | |
1da177e4 | 644 | * |
da6052f7 NP |
645 | * The pagecache pages are stored in a per-mapping radix tree, which is |
646 | * rooted at mapping->page_tree, and indexed by offset. | |
647 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space | |
648 | * lists, we instead now tag pages as dirty/writeback in the radix tree. | |
1da177e4 | 649 | * |
da6052f7 | 650 | * All pagecache pages may be subject to I/O: |
1da177e4 LT |
651 | * - inode pages may need to be read from disk, |
652 | * - inode pages which have been modified and are MAP_SHARED may need | |
da6052f7 NP |
653 | * to be written back to the inode on disk, |
654 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been | |
655 | * modified may need to be swapped out to swap space and (later) to be read | |
656 | * back into memory. | |
1da177e4 LT |
657 | */ |
658 | ||
659 | /* | |
660 | * The zone field is never updated after free_area_init_core() | |
661 | * sets it, so none of the operations on it need to be atomic. | |
1da177e4 | 662 | */ |
348f8b6c | 663 | |
90572890 | 664 | /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */ |
07808b74 | 665 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
d41dee36 AW |
666 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
667 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) | |
90572890 | 668 | #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH) |
d41dee36 | 669 | |
348f8b6c | 670 | /* |
25985edc | 671 | * Define the bit shifts to access each section. For non-existent |
348f8b6c DH |
672 | * sections we define the shift as 0; that plus a 0 mask ensures |
673 | * the compiler will optimise away reference to them. | |
674 | */ | |
d41dee36 AW |
675 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
676 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) | |
677 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) | |
90572890 | 678 | #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0)) |
348f8b6c | 679 | |
bce54bbf WD |
680 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ |
681 | #ifdef NODE_NOT_IN_PAGE_FLAGS | |
89689ae7 | 682 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
683 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
684 | SECTIONS_PGOFF : ZONES_PGOFF) | |
d41dee36 | 685 | #else |
89689ae7 | 686 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
687 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
688 | NODES_PGOFF : ZONES_PGOFF) | |
89689ae7 CL |
689 | #endif |
690 | ||
bd8029b6 | 691 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
348f8b6c | 692 | |
9223b419 CL |
693 | #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
694 | #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS | |
348f8b6c DH |
695 | #endif |
696 | ||
d41dee36 AW |
697 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
698 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) | |
699 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) | |
834a964a | 700 | #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1) |
89689ae7 | 701 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
348f8b6c | 702 | |
33dd4e0e | 703 | static inline enum zone_type page_zonenum(const struct page *page) |
1da177e4 | 704 | { |
348f8b6c | 705 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
1da177e4 | 706 | } |
1da177e4 | 707 | |
260ae3f7 | 708 | #ifdef CONFIG_ZONE_DEVICE |
3565fce3 DW |
709 | void get_zone_device_page(struct page *page); |
710 | void put_zone_device_page(struct page *page); | |
260ae3f7 DW |
711 | static inline bool is_zone_device_page(const struct page *page) |
712 | { | |
713 | return page_zonenum(page) == ZONE_DEVICE; | |
714 | } | |
715 | #else | |
3565fce3 DW |
716 | static inline void get_zone_device_page(struct page *page) |
717 | { | |
718 | } | |
719 | static inline void put_zone_device_page(struct page *page) | |
720 | { | |
721 | } | |
260ae3f7 DW |
722 | static inline bool is_zone_device_page(const struct page *page) |
723 | { | |
724 | return false; | |
725 | } | |
726 | #endif | |
727 | ||
3565fce3 DW |
728 | static inline void get_page(struct page *page) |
729 | { | |
730 | page = compound_head(page); | |
731 | /* | |
732 | * Getting a normal page or the head of a compound page | |
733 | * requires to already have an elevated page->_count. | |
734 | */ | |
fe896d18 JK |
735 | VM_BUG_ON_PAGE(page_ref_count(page) <= 0, page); |
736 | page_ref_inc(page); | |
3565fce3 DW |
737 | |
738 | if (unlikely(is_zone_device_page(page))) | |
739 | get_zone_device_page(page); | |
740 | } | |
741 | ||
742 | static inline void put_page(struct page *page) | |
743 | { | |
744 | page = compound_head(page); | |
745 | ||
746 | if (put_page_testzero(page)) | |
747 | __put_page(page); | |
748 | ||
749 | if (unlikely(is_zone_device_page(page))) | |
750 | put_zone_device_page(page); | |
751 | } | |
752 | ||
9127ab4f CS |
753 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
754 | #define SECTION_IN_PAGE_FLAGS | |
755 | #endif | |
756 | ||
89689ae7 | 757 | /* |
7a8010cd VB |
758 | * The identification function is mainly used by the buddy allocator for |
759 | * determining if two pages could be buddies. We are not really identifying | |
760 | * the zone since we could be using the section number id if we do not have | |
761 | * node id available in page flags. | |
762 | * We only guarantee that it will return the same value for two combinable | |
763 | * pages in a zone. | |
89689ae7 | 764 | */ |
cb2b95e1 AW |
765 | static inline int page_zone_id(struct page *page) |
766 | { | |
89689ae7 | 767 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
348f8b6c DH |
768 | } |
769 | ||
25ba77c1 | 770 | static inline int zone_to_nid(struct zone *zone) |
89fa3024 | 771 | { |
d5f541ed CL |
772 | #ifdef CONFIG_NUMA |
773 | return zone->node; | |
774 | #else | |
775 | return 0; | |
776 | #endif | |
89fa3024 CL |
777 | } |
778 | ||
89689ae7 | 779 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
33dd4e0e | 780 | extern int page_to_nid(const struct page *page); |
89689ae7 | 781 | #else |
33dd4e0e | 782 | static inline int page_to_nid(const struct page *page) |
d41dee36 | 783 | { |
89689ae7 | 784 | return (page->flags >> NODES_PGSHIFT) & NODES_MASK; |
d41dee36 | 785 | } |
89689ae7 CL |
786 | #endif |
787 | ||
57e0a030 | 788 | #ifdef CONFIG_NUMA_BALANCING |
90572890 | 789 | static inline int cpu_pid_to_cpupid(int cpu, int pid) |
57e0a030 | 790 | { |
90572890 | 791 | return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK); |
57e0a030 MG |
792 | } |
793 | ||
90572890 | 794 | static inline int cpupid_to_pid(int cpupid) |
57e0a030 | 795 | { |
90572890 | 796 | return cpupid & LAST__PID_MASK; |
57e0a030 | 797 | } |
b795854b | 798 | |
90572890 | 799 | static inline int cpupid_to_cpu(int cpupid) |
b795854b | 800 | { |
90572890 | 801 | return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK; |
b795854b MG |
802 | } |
803 | ||
90572890 | 804 | static inline int cpupid_to_nid(int cpupid) |
b795854b | 805 | { |
90572890 | 806 | return cpu_to_node(cpupid_to_cpu(cpupid)); |
b795854b MG |
807 | } |
808 | ||
90572890 | 809 | static inline bool cpupid_pid_unset(int cpupid) |
57e0a030 | 810 | { |
90572890 | 811 | return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK); |
b795854b MG |
812 | } |
813 | ||
90572890 | 814 | static inline bool cpupid_cpu_unset(int cpupid) |
b795854b | 815 | { |
90572890 | 816 | return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK); |
b795854b MG |
817 | } |
818 | ||
8c8a743c PZ |
819 | static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid) |
820 | { | |
821 | return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid); | |
822 | } | |
823 | ||
824 | #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid) | |
90572890 PZ |
825 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
826 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
b795854b | 827 | { |
1ae71d03 | 828 | return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK); |
b795854b | 829 | } |
90572890 PZ |
830 | |
831 | static inline int page_cpupid_last(struct page *page) | |
832 | { | |
833 | return page->_last_cpupid; | |
834 | } | |
835 | static inline void page_cpupid_reset_last(struct page *page) | |
b795854b | 836 | { |
1ae71d03 | 837 | page->_last_cpupid = -1 & LAST_CPUPID_MASK; |
57e0a030 MG |
838 | } |
839 | #else | |
90572890 | 840 | static inline int page_cpupid_last(struct page *page) |
75980e97 | 841 | { |
90572890 | 842 | return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK; |
75980e97 PZ |
843 | } |
844 | ||
90572890 | 845 | extern int page_cpupid_xchg_last(struct page *page, int cpupid); |
75980e97 | 846 | |
90572890 | 847 | static inline void page_cpupid_reset_last(struct page *page) |
75980e97 | 848 | { |
90572890 | 849 | int cpupid = (1 << LAST_CPUPID_SHIFT) - 1; |
4468b8f1 | 850 | |
90572890 PZ |
851 | page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT); |
852 | page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT; | |
75980e97 | 853 | } |
90572890 PZ |
854 | #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */ |
855 | #else /* !CONFIG_NUMA_BALANCING */ | |
856 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
57e0a030 | 857 | { |
90572890 | 858 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
859 | } |
860 | ||
90572890 | 861 | static inline int page_cpupid_last(struct page *page) |
57e0a030 | 862 | { |
90572890 | 863 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
864 | } |
865 | ||
90572890 | 866 | static inline int cpupid_to_nid(int cpupid) |
b795854b MG |
867 | { |
868 | return -1; | |
869 | } | |
870 | ||
90572890 | 871 | static inline int cpupid_to_pid(int cpupid) |
b795854b MG |
872 | { |
873 | return -1; | |
874 | } | |
875 | ||
90572890 | 876 | static inline int cpupid_to_cpu(int cpupid) |
b795854b MG |
877 | { |
878 | return -1; | |
879 | } | |
880 | ||
90572890 PZ |
881 | static inline int cpu_pid_to_cpupid(int nid, int pid) |
882 | { | |
883 | return -1; | |
884 | } | |
885 | ||
886 | static inline bool cpupid_pid_unset(int cpupid) | |
b795854b MG |
887 | { |
888 | return 1; | |
889 | } | |
890 | ||
90572890 | 891 | static inline void page_cpupid_reset_last(struct page *page) |
57e0a030 MG |
892 | { |
893 | } | |
8c8a743c PZ |
894 | |
895 | static inline bool cpupid_match_pid(struct task_struct *task, int cpupid) | |
896 | { | |
897 | return false; | |
898 | } | |
90572890 | 899 | #endif /* CONFIG_NUMA_BALANCING */ |
57e0a030 | 900 | |
33dd4e0e | 901 | static inline struct zone *page_zone(const struct page *page) |
89689ae7 CL |
902 | { |
903 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; | |
904 | } | |
905 | ||
9127ab4f | 906 | #ifdef SECTION_IN_PAGE_FLAGS |
bf4e8902 DK |
907 | static inline void set_page_section(struct page *page, unsigned long section) |
908 | { | |
909 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); | |
910 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; | |
911 | } | |
912 | ||
aa462abe | 913 | static inline unsigned long page_to_section(const struct page *page) |
d41dee36 AW |
914 | { |
915 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; | |
916 | } | |
308c05e3 | 917 | #endif |
d41dee36 | 918 | |
2f1b6248 | 919 | static inline void set_page_zone(struct page *page, enum zone_type zone) |
348f8b6c DH |
920 | { |
921 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); | |
922 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; | |
923 | } | |
2f1b6248 | 924 | |
348f8b6c DH |
925 | static inline void set_page_node(struct page *page, unsigned long node) |
926 | { | |
927 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); | |
928 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; | |
1da177e4 | 929 | } |
89689ae7 | 930 | |
2f1b6248 | 931 | static inline void set_page_links(struct page *page, enum zone_type zone, |
d41dee36 | 932 | unsigned long node, unsigned long pfn) |
1da177e4 | 933 | { |
348f8b6c DH |
934 | set_page_zone(page, zone); |
935 | set_page_node(page, node); | |
9127ab4f | 936 | #ifdef SECTION_IN_PAGE_FLAGS |
d41dee36 | 937 | set_page_section(page, pfn_to_section_nr(pfn)); |
bf4e8902 | 938 | #endif |
1da177e4 LT |
939 | } |
940 | ||
0610c25d GT |
941 | #ifdef CONFIG_MEMCG |
942 | static inline struct mem_cgroup *page_memcg(struct page *page) | |
943 | { | |
944 | return page->mem_cgroup; | |
945 | } | |
0610c25d GT |
946 | #else |
947 | static inline struct mem_cgroup *page_memcg(struct page *page) | |
948 | { | |
949 | return NULL; | |
950 | } | |
0610c25d GT |
951 | #endif |
952 | ||
f6ac2354 CL |
953 | /* |
954 | * Some inline functions in vmstat.h depend on page_zone() | |
955 | */ | |
956 | #include <linux/vmstat.h> | |
957 | ||
33dd4e0e | 958 | static __always_inline void *lowmem_page_address(const struct page *page) |
1da177e4 | 959 | { |
aa462abe | 960 | return __va(PFN_PHYS(page_to_pfn(page))); |
1da177e4 LT |
961 | } |
962 | ||
963 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) | |
964 | #define HASHED_PAGE_VIRTUAL | |
965 | #endif | |
966 | ||
967 | #if defined(WANT_PAGE_VIRTUAL) | |
f92f455f GU |
968 | static inline void *page_address(const struct page *page) |
969 | { | |
970 | return page->virtual; | |
971 | } | |
972 | static inline void set_page_address(struct page *page, void *address) | |
973 | { | |
974 | page->virtual = address; | |
975 | } | |
1da177e4 LT |
976 | #define page_address_init() do { } while(0) |
977 | #endif | |
978 | ||
979 | #if defined(HASHED_PAGE_VIRTUAL) | |
f9918794 | 980 | void *page_address(const struct page *page); |
1da177e4 LT |
981 | void set_page_address(struct page *page, void *virtual); |
982 | void page_address_init(void); | |
983 | #endif | |
984 | ||
985 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) | |
986 | #define page_address(page) lowmem_page_address(page) | |
987 | #define set_page_address(page, address) do { } while(0) | |
988 | #define page_address_init() do { } while(0) | |
989 | #endif | |
990 | ||
e39155ea KS |
991 | extern void *page_rmapping(struct page *page); |
992 | extern struct anon_vma *page_anon_vma(struct page *page); | |
9800339b | 993 | extern struct address_space *page_mapping(struct page *page); |
1da177e4 | 994 | |
f981c595 MG |
995 | extern struct address_space *__page_file_mapping(struct page *); |
996 | ||
997 | static inline | |
998 | struct address_space *page_file_mapping(struct page *page) | |
999 | { | |
1000 | if (unlikely(PageSwapCache(page))) | |
1001 | return __page_file_mapping(page); | |
1002 | ||
1003 | return page->mapping; | |
1004 | } | |
1005 | ||
1da177e4 LT |
1006 | /* |
1007 | * Return the pagecache index of the passed page. Regular pagecache pages | |
1008 | * use ->index whereas swapcache pages use ->private | |
1009 | */ | |
1010 | static inline pgoff_t page_index(struct page *page) | |
1011 | { | |
1012 | if (unlikely(PageSwapCache(page))) | |
4c21e2f2 | 1013 | return page_private(page); |
1da177e4 LT |
1014 | return page->index; |
1015 | } | |
1016 | ||
f981c595 MG |
1017 | extern pgoff_t __page_file_index(struct page *page); |
1018 | ||
1019 | /* | |
1020 | * Return the file index of the page. Regular pagecache pages use ->index | |
1021 | * whereas swapcache pages use swp_offset(->private) | |
1022 | */ | |
1023 | static inline pgoff_t page_file_index(struct page *page) | |
1024 | { | |
1025 | if (unlikely(PageSwapCache(page))) | |
1026 | return __page_file_index(page); | |
1027 | ||
1028 | return page->index; | |
1029 | } | |
1030 | ||
1da177e4 LT |
1031 | /* |
1032 | * Return true if this page is mapped into pagetables. | |
e1534ae9 | 1033 | * For compound page it returns true if any subpage of compound page is mapped. |
1da177e4 | 1034 | */ |
e1534ae9 | 1035 | static inline bool page_mapped(struct page *page) |
1da177e4 | 1036 | { |
e1534ae9 KS |
1037 | int i; |
1038 | if (likely(!PageCompound(page))) | |
1039 | return atomic_read(&page->_mapcount) >= 0; | |
1040 | page = compound_head(page); | |
1041 | if (atomic_read(compound_mapcount_ptr(page)) >= 0) | |
1042 | return true; | |
66ee95d1 SC |
1043 | if (PageHuge(page)) |
1044 | return false; | |
e1534ae9 KS |
1045 | for (i = 0; i < hpage_nr_pages(page); i++) { |
1046 | if (atomic_read(&page[i]._mapcount) >= 0) | |
1047 | return true; | |
1048 | } | |
1049 | return false; | |
1da177e4 LT |
1050 | } |
1051 | ||
2f064f34 MH |
1052 | /* |
1053 | * Return true only if the page has been allocated with | |
1054 | * ALLOC_NO_WATERMARKS and the low watermark was not | |
1055 | * met implying that the system is under some pressure. | |
1056 | */ | |
1057 | static inline bool page_is_pfmemalloc(struct page *page) | |
1058 | { | |
1059 | /* | |
1060 | * Page index cannot be this large so this must be | |
1061 | * a pfmemalloc page. | |
1062 | */ | |
1063 | return page->index == -1UL; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * Only to be called by the page allocator on a freshly allocated | |
1068 | * page. | |
1069 | */ | |
1070 | static inline void set_page_pfmemalloc(struct page *page) | |
1071 | { | |
1072 | page->index = -1UL; | |
1073 | } | |
1074 | ||
1075 | static inline void clear_page_pfmemalloc(struct page *page) | |
1076 | { | |
1077 | page->index = 0; | |
1078 | } | |
1079 | ||
1da177e4 LT |
1080 | /* |
1081 | * Different kinds of faults, as returned by handle_mm_fault(). | |
1082 | * Used to decide whether a process gets delivered SIGBUS or | |
1083 | * just gets major/minor fault counters bumped up. | |
1084 | */ | |
d0217ac0 | 1085 | |
83c54070 NP |
1086 | #define VM_FAULT_OOM 0x0001 |
1087 | #define VM_FAULT_SIGBUS 0x0002 | |
1088 | #define VM_FAULT_MAJOR 0x0004 | |
1089 | #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ | |
aa50d3a7 AK |
1090 | #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */ |
1091 | #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */ | |
33692f27 | 1092 | #define VM_FAULT_SIGSEGV 0x0040 |
f33ea7f4 | 1093 | |
83c54070 NP |
1094 | #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ |
1095 | #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ | |
d065bd81 | 1096 | #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */ |
c0292554 | 1097 | #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */ |
1da177e4 | 1098 | |
aa50d3a7 AK |
1099 | #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */ |
1100 | ||
33692f27 LT |
1101 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \ |
1102 | VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \ | |
1103 | VM_FAULT_FALLBACK) | |
aa50d3a7 AK |
1104 | |
1105 | /* Encode hstate index for a hwpoisoned large page */ | |
1106 | #define VM_FAULT_SET_HINDEX(x) ((x) << 12) | |
1107 | #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf) | |
d0217ac0 | 1108 | |
1c0fe6e3 NP |
1109 | /* |
1110 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. | |
1111 | */ | |
1112 | extern void pagefault_out_of_memory(void); | |
1113 | ||
1da177e4 LT |
1114 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
1115 | ||
ddd588b5 | 1116 | /* |
7bf02ea2 | 1117 | * Flags passed to show_mem() and show_free_areas() to suppress output in |
ddd588b5 DR |
1118 | * various contexts. |
1119 | */ | |
4b59e6c4 | 1120 | #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */ |
ddd588b5 | 1121 | |
7bf02ea2 DR |
1122 | extern void show_free_areas(unsigned int flags); |
1123 | extern bool skip_free_areas_node(unsigned int flags, int nid); | |
1da177e4 | 1124 | |
1da177e4 | 1125 | int shmem_zero_setup(struct vm_area_struct *); |
0cd6144a JW |
1126 | #ifdef CONFIG_SHMEM |
1127 | bool shmem_mapping(struct address_space *mapping); | |
1128 | #else | |
1129 | static inline bool shmem_mapping(struct address_space *mapping) | |
1130 | { | |
1131 | return false; | |
1132 | } | |
1133 | #endif | |
1da177e4 | 1134 | |
7f43add4 | 1135 | extern bool can_do_mlock(void); |
1da177e4 LT |
1136 | extern int user_shm_lock(size_t, struct user_struct *); |
1137 | extern void user_shm_unlock(size_t, struct user_struct *); | |
1138 | ||
1139 | /* | |
1140 | * Parameter block passed down to zap_pte_range in exceptional cases. | |
1141 | */ | |
1142 | struct zap_details { | |
1da177e4 LT |
1143 | struct address_space *check_mapping; /* Check page->mapping if set */ |
1144 | pgoff_t first_index; /* Lowest page->index to unmap */ | |
1145 | pgoff_t last_index; /* Highest page->index to unmap */ | |
aac45363 MH |
1146 | bool ignore_dirty; /* Ignore dirty pages */ |
1147 | bool check_swap_entries; /* Check also swap entries */ | |
1da177e4 LT |
1148 | }; |
1149 | ||
7e675137 NP |
1150 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
1151 | pte_t pte); | |
28093f9f GS |
1152 | struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr, |
1153 | pmd_t pmd); | |
7e675137 | 1154 | |
c627f9cc JS |
1155 | int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
1156 | unsigned long size); | |
14f5ff5d | 1157 | void zap_page_range(struct vm_area_struct *vma, unsigned long address, |
1da177e4 | 1158 | unsigned long size, struct zap_details *); |
4f74d2c8 LT |
1159 | void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
1160 | unsigned long start, unsigned long end); | |
e6473092 MM |
1161 | |
1162 | /** | |
1163 | * mm_walk - callbacks for walk_page_range | |
e6473092 | 1164 | * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry |
03319327 DH |
1165 | * this handler is required to be able to handle |
1166 | * pmd_trans_huge() pmds. They may simply choose to | |
1167 | * split_huge_page() instead of handling it explicitly. | |
e6473092 MM |
1168 | * @pte_entry: if set, called for each non-empty PTE (4th-level) entry |
1169 | * @pte_hole: if set, called for each hole at all levels | |
5dc37642 | 1170 | * @hugetlb_entry: if set, called for each hugetlb entry |
fafaa426 NH |
1171 | * @test_walk: caller specific callback function to determine whether |
1172 | * we walk over the current vma or not. A positive returned | |
1173 | * value means "do page table walk over the current vma," | |
1174 | * and a negative one means "abort current page table walk | |
1175 | * right now." 0 means "skip the current vma." | |
1176 | * @mm: mm_struct representing the target process of page table walk | |
1177 | * @vma: vma currently walked (NULL if walking outside vmas) | |
1178 | * @private: private data for callbacks' usage | |
e6473092 | 1179 | * |
fafaa426 | 1180 | * (see the comment on walk_page_range() for more details) |
e6473092 MM |
1181 | */ |
1182 | struct mm_walk { | |
0f157a5b AM |
1183 | int (*pmd_entry)(pmd_t *pmd, unsigned long addr, |
1184 | unsigned long next, struct mm_walk *walk); | |
1185 | int (*pte_entry)(pte_t *pte, unsigned long addr, | |
1186 | unsigned long next, struct mm_walk *walk); | |
1187 | int (*pte_hole)(unsigned long addr, unsigned long next, | |
1188 | struct mm_walk *walk); | |
1189 | int (*hugetlb_entry)(pte_t *pte, unsigned long hmask, | |
1190 | unsigned long addr, unsigned long next, | |
1191 | struct mm_walk *walk); | |
fafaa426 NH |
1192 | int (*test_walk)(unsigned long addr, unsigned long next, |
1193 | struct mm_walk *walk); | |
2165009b | 1194 | struct mm_struct *mm; |
fafaa426 | 1195 | struct vm_area_struct *vma; |
2165009b | 1196 | void *private; |
e6473092 MM |
1197 | }; |
1198 | ||
2165009b DH |
1199 | int walk_page_range(unsigned long addr, unsigned long end, |
1200 | struct mm_walk *walk); | |
900fc5f1 | 1201 | int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk); |
42b77728 | 1202 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
3bf5ee95 | 1203 | unsigned long end, unsigned long floor, unsigned long ceiling); |
1da177e4 LT |
1204 | int copy_page_range(struct mm_struct *dst, struct mm_struct *src, |
1205 | struct vm_area_struct *vma); | |
1da177e4 LT |
1206 | void unmap_mapping_range(struct address_space *mapping, |
1207 | loff_t const holebegin, loff_t const holelen, int even_cows); | |
3b6748e2 JW |
1208 | int follow_pfn(struct vm_area_struct *vma, unsigned long address, |
1209 | unsigned long *pfn); | |
d87fe660 | 1210 | int follow_phys(struct vm_area_struct *vma, unsigned long address, |
1211 | unsigned int flags, unsigned long *prot, resource_size_t *phys); | |
28b2ee20 RR |
1212 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
1213 | void *buf, int len, int write); | |
1da177e4 LT |
1214 | |
1215 | static inline void unmap_shared_mapping_range(struct address_space *mapping, | |
1216 | loff_t const holebegin, loff_t const holelen) | |
1217 | { | |
1218 | unmap_mapping_range(mapping, holebegin, holelen, 0); | |
1219 | } | |
1220 | ||
7caef267 | 1221 | extern void truncate_pagecache(struct inode *inode, loff_t new); |
2c27c65e | 1222 | extern void truncate_setsize(struct inode *inode, loff_t newsize); |
90a80202 | 1223 | void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to); |
623e3db9 | 1224 | void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end); |
750b4987 | 1225 | int truncate_inode_page(struct address_space *mapping, struct page *page); |
25718736 | 1226 | int generic_error_remove_page(struct address_space *mapping, struct page *page); |
83f78668 WF |
1227 | int invalidate_inode_page(struct page *page); |
1228 | ||
7ee1dd3f | 1229 | #ifdef CONFIG_MMU |
83c54070 | 1230 | extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
d06063cc | 1231 | unsigned long address, unsigned int flags); |
5c723ba5 | 1232 | extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, |
4a9e1cda DD |
1233 | unsigned long address, unsigned int fault_flags, |
1234 | bool *unlocked); | |
7ee1dd3f DH |
1235 | #else |
1236 | static inline int handle_mm_fault(struct mm_struct *mm, | |
1237 | struct vm_area_struct *vma, unsigned long address, | |
d06063cc | 1238 | unsigned int flags) |
7ee1dd3f DH |
1239 | { |
1240 | /* should never happen if there's no MMU */ | |
1241 | BUG(); | |
1242 | return VM_FAULT_SIGBUS; | |
1243 | } | |
5c723ba5 PZ |
1244 | static inline int fixup_user_fault(struct task_struct *tsk, |
1245 | struct mm_struct *mm, unsigned long address, | |
4a9e1cda | 1246 | unsigned int fault_flags, bool *unlocked) |
5c723ba5 PZ |
1247 | { |
1248 | /* should never happen if there's no MMU */ | |
1249 | BUG(); | |
1250 | return -EFAULT; | |
1251 | } | |
7ee1dd3f | 1252 | #endif |
f33ea7f4 | 1253 | |
1da177e4 | 1254 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); |
5ddd36b9 SW |
1255 | extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
1256 | void *buf, int len, int write); | |
1da177e4 | 1257 | |
28a35716 ML |
1258 | long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, |
1259 | unsigned long start, unsigned long nr_pages, | |
1260 | unsigned int foll_flags, struct page **pages, | |
1261 | struct vm_area_struct **vmas, int *nonblocking); | |
1e987790 DH |
1262 | long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm, |
1263 | unsigned long start, unsigned long nr_pages, | |
1264 | int write, int force, struct page **pages, | |
1265 | struct vm_area_struct **vmas); | |
c12d2da5 | 1266 | long get_user_pages(unsigned long start, unsigned long nr_pages, |
cde70140 DH |
1267 | int write, int force, struct page **pages, |
1268 | struct vm_area_struct **vmas); | |
c12d2da5 | 1269 | long get_user_pages_locked(unsigned long start, unsigned long nr_pages, |
cde70140 | 1270 | int write, int force, struct page **pages, int *locked); |
0fd71a56 AA |
1271 | long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm, |
1272 | unsigned long start, unsigned long nr_pages, | |
1273 | int write, int force, struct page **pages, | |
1274 | unsigned int gup_flags); | |
c12d2da5 | 1275 | long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages, |
f0818f47 | 1276 | int write, int force, struct page **pages); |
d2bf6be8 NP |
1277 | int get_user_pages_fast(unsigned long start, int nr_pages, int write, |
1278 | struct page **pages); | |
8025e5dd JK |
1279 | |
1280 | /* Container for pinned pfns / pages */ | |
1281 | struct frame_vector { | |
1282 | unsigned int nr_allocated; /* Number of frames we have space for */ | |
1283 | unsigned int nr_frames; /* Number of frames stored in ptrs array */ | |
1284 | bool got_ref; /* Did we pin pages by getting page ref? */ | |
1285 | bool is_pfns; /* Does array contain pages or pfns? */ | |
1286 | void *ptrs[0]; /* Array of pinned pfns / pages. Use | |
1287 | * pfns_vector_pages() or pfns_vector_pfns() | |
1288 | * for access */ | |
1289 | }; | |
1290 | ||
1291 | struct frame_vector *frame_vector_create(unsigned int nr_frames); | |
1292 | void frame_vector_destroy(struct frame_vector *vec); | |
1293 | int get_vaddr_frames(unsigned long start, unsigned int nr_pfns, | |
1294 | bool write, bool force, struct frame_vector *vec); | |
1295 | void put_vaddr_frames(struct frame_vector *vec); | |
1296 | int frame_vector_to_pages(struct frame_vector *vec); | |
1297 | void frame_vector_to_pfns(struct frame_vector *vec); | |
1298 | ||
1299 | static inline unsigned int frame_vector_count(struct frame_vector *vec) | |
1300 | { | |
1301 | return vec->nr_frames; | |
1302 | } | |
1303 | ||
1304 | static inline struct page **frame_vector_pages(struct frame_vector *vec) | |
1305 | { | |
1306 | if (vec->is_pfns) { | |
1307 | int err = frame_vector_to_pages(vec); | |
1308 | ||
1309 | if (err) | |
1310 | return ERR_PTR(err); | |
1311 | } | |
1312 | return (struct page **)(vec->ptrs); | |
1313 | } | |
1314 | ||
1315 | static inline unsigned long *frame_vector_pfns(struct frame_vector *vec) | |
1316 | { | |
1317 | if (!vec->is_pfns) | |
1318 | frame_vector_to_pfns(vec); | |
1319 | return (unsigned long *)(vec->ptrs); | |
1320 | } | |
1321 | ||
18022c5d MG |
1322 | struct kvec; |
1323 | int get_kernel_pages(const struct kvec *iov, int nr_pages, int write, | |
1324 | struct page **pages); | |
1325 | int get_kernel_page(unsigned long start, int write, struct page **pages); | |
f3e8fccd | 1326 | struct page *get_dump_page(unsigned long addr); |
1da177e4 | 1327 | |
cf9a2ae8 | 1328 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
d47992f8 LC |
1329 | extern void do_invalidatepage(struct page *page, unsigned int offset, |
1330 | unsigned int length); | |
cf9a2ae8 | 1331 | |
1da177e4 | 1332 | int __set_page_dirty_nobuffers(struct page *page); |
76719325 | 1333 | int __set_page_dirty_no_writeback(struct page *page); |
1da177e4 LT |
1334 | int redirty_page_for_writepage(struct writeback_control *wbc, |
1335 | struct page *page); | |
62cccb8c | 1336 | void account_page_dirtied(struct page *page, struct address_space *mapping); |
c4843a75 | 1337 | void account_page_cleaned(struct page *page, struct address_space *mapping, |
62cccb8c | 1338 | struct bdi_writeback *wb); |
b3c97528 | 1339 | int set_page_dirty(struct page *page); |
1da177e4 | 1340 | int set_page_dirty_lock(struct page *page); |
11f81bec | 1341 | void cancel_dirty_page(struct page *page); |
1da177e4 | 1342 | int clear_page_dirty_for_io(struct page *page); |
b9ea2515 | 1343 | |
a9090253 | 1344 | int get_cmdline(struct task_struct *task, char *buffer, int buflen); |
1da177e4 | 1345 | |
39aa3cb3 | 1346 | /* Is the vma a continuation of the stack vma above it? */ |
a09a79f6 | 1347 | static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr) |
39aa3cb3 SB |
1348 | { |
1349 | return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN); | |
1350 | } | |
1351 | ||
b5330628 ON |
1352 | static inline bool vma_is_anonymous(struct vm_area_struct *vma) |
1353 | { | |
1354 | return !vma->vm_ops; | |
1355 | } | |
1356 | ||
a09a79f6 MP |
1357 | static inline int stack_guard_page_start(struct vm_area_struct *vma, |
1358 | unsigned long addr) | |
1359 | { | |
1360 | return (vma->vm_flags & VM_GROWSDOWN) && | |
1361 | (vma->vm_start == addr) && | |
1362 | !vma_growsdown(vma->vm_prev, addr); | |
1363 | } | |
1364 | ||
1365 | /* Is the vma a continuation of the stack vma below it? */ | |
1366 | static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr) | |
1367 | { | |
1368 | return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP); | |
1369 | } | |
1370 | ||
1371 | static inline int stack_guard_page_end(struct vm_area_struct *vma, | |
1372 | unsigned long addr) | |
1373 | { | |
1374 | return (vma->vm_flags & VM_GROWSUP) && | |
1375 | (vma->vm_end == addr) && | |
1376 | !vma_growsup(vma->vm_next, addr); | |
1377 | } | |
1378 | ||
65376df5 | 1379 | int vma_is_stack_for_task(struct vm_area_struct *vma, struct task_struct *t); |
b7643757 | 1380 | |
b6a2fea3 OW |
1381 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
1382 | unsigned long old_addr, struct vm_area_struct *new_vma, | |
38a76013 ML |
1383 | unsigned long new_addr, unsigned long len, |
1384 | bool need_rmap_locks); | |
7da4d641 PZ |
1385 | extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start, |
1386 | unsigned long end, pgprot_t newprot, | |
4b10e7d5 | 1387 | int dirty_accountable, int prot_numa); |
b6a2fea3 OW |
1388 | extern int mprotect_fixup(struct vm_area_struct *vma, |
1389 | struct vm_area_struct **pprev, unsigned long start, | |
1390 | unsigned long end, unsigned long newflags); | |
1da177e4 | 1391 | |
465a454f PZ |
1392 | /* |
1393 | * doesn't attempt to fault and will return short. | |
1394 | */ | |
1395 | int __get_user_pages_fast(unsigned long start, int nr_pages, int write, | |
1396 | struct page **pages); | |
d559db08 KH |
1397 | /* |
1398 | * per-process(per-mm_struct) statistics. | |
1399 | */ | |
d559db08 KH |
1400 | static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) |
1401 | { | |
69c97823 KK |
1402 | long val = atomic_long_read(&mm->rss_stat.count[member]); |
1403 | ||
1404 | #ifdef SPLIT_RSS_COUNTING | |
1405 | /* | |
1406 | * counter is updated in asynchronous manner and may go to minus. | |
1407 | * But it's never be expected number for users. | |
1408 | */ | |
1409 | if (val < 0) | |
1410 | val = 0; | |
172703b0 | 1411 | #endif |
69c97823 KK |
1412 | return (unsigned long)val; |
1413 | } | |
d559db08 KH |
1414 | |
1415 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) | |
1416 | { | |
172703b0 | 1417 | atomic_long_add(value, &mm->rss_stat.count[member]); |
d559db08 KH |
1418 | } |
1419 | ||
1420 | static inline void inc_mm_counter(struct mm_struct *mm, int member) | |
1421 | { | |
172703b0 | 1422 | atomic_long_inc(&mm->rss_stat.count[member]); |
d559db08 KH |
1423 | } |
1424 | ||
1425 | static inline void dec_mm_counter(struct mm_struct *mm, int member) | |
1426 | { | |
172703b0 | 1427 | atomic_long_dec(&mm->rss_stat.count[member]); |
d559db08 KH |
1428 | } |
1429 | ||
eca56ff9 JM |
1430 | /* Optimized variant when page is already known not to be PageAnon */ |
1431 | static inline int mm_counter_file(struct page *page) | |
1432 | { | |
1433 | if (PageSwapBacked(page)) | |
1434 | return MM_SHMEMPAGES; | |
1435 | return MM_FILEPAGES; | |
1436 | } | |
1437 | ||
1438 | static inline int mm_counter(struct page *page) | |
1439 | { | |
1440 | if (PageAnon(page)) | |
1441 | return MM_ANONPAGES; | |
1442 | return mm_counter_file(page); | |
1443 | } | |
1444 | ||
d559db08 KH |
1445 | static inline unsigned long get_mm_rss(struct mm_struct *mm) |
1446 | { | |
1447 | return get_mm_counter(mm, MM_FILEPAGES) + | |
eca56ff9 JM |
1448 | get_mm_counter(mm, MM_ANONPAGES) + |
1449 | get_mm_counter(mm, MM_SHMEMPAGES); | |
d559db08 KH |
1450 | } |
1451 | ||
1452 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) | |
1453 | { | |
1454 | return max(mm->hiwater_rss, get_mm_rss(mm)); | |
1455 | } | |
1456 | ||
1457 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) | |
1458 | { | |
1459 | return max(mm->hiwater_vm, mm->total_vm); | |
1460 | } | |
1461 | ||
1462 | static inline void update_hiwater_rss(struct mm_struct *mm) | |
1463 | { | |
1464 | unsigned long _rss = get_mm_rss(mm); | |
1465 | ||
1466 | if ((mm)->hiwater_rss < _rss) | |
1467 | (mm)->hiwater_rss = _rss; | |
1468 | } | |
1469 | ||
1470 | static inline void update_hiwater_vm(struct mm_struct *mm) | |
1471 | { | |
1472 | if (mm->hiwater_vm < mm->total_vm) | |
1473 | mm->hiwater_vm = mm->total_vm; | |
1474 | } | |
1475 | ||
695f0559 PC |
1476 | static inline void reset_mm_hiwater_rss(struct mm_struct *mm) |
1477 | { | |
1478 | mm->hiwater_rss = get_mm_rss(mm); | |
1479 | } | |
1480 | ||
d559db08 KH |
1481 | static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, |
1482 | struct mm_struct *mm) | |
1483 | { | |
1484 | unsigned long hiwater_rss = get_mm_hiwater_rss(mm); | |
1485 | ||
1486 | if (*maxrss < hiwater_rss) | |
1487 | *maxrss = hiwater_rss; | |
1488 | } | |
1489 | ||
53bddb4e | 1490 | #if defined(SPLIT_RSS_COUNTING) |
05af2e10 | 1491 | void sync_mm_rss(struct mm_struct *mm); |
53bddb4e | 1492 | #else |
05af2e10 | 1493 | static inline void sync_mm_rss(struct mm_struct *mm) |
53bddb4e KH |
1494 | { |
1495 | } | |
1496 | #endif | |
465a454f | 1497 | |
3565fce3 DW |
1498 | #ifndef __HAVE_ARCH_PTE_DEVMAP |
1499 | static inline int pte_devmap(pte_t pte) | |
1500 | { | |
1501 | return 0; | |
1502 | } | |
1503 | #endif | |
1504 | ||
4e950f6f | 1505 | int vma_wants_writenotify(struct vm_area_struct *vma); |
d08b3851 | 1506 | |
25ca1d6c NK |
1507 | extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr, |
1508 | spinlock_t **ptl); | |
1509 | static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, | |
1510 | spinlock_t **ptl) | |
1511 | { | |
1512 | pte_t *ptep; | |
1513 | __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl)); | |
1514 | return ptep; | |
1515 | } | |
c9cfcddf | 1516 | |
5f22df00 NP |
1517 | #ifdef __PAGETABLE_PUD_FOLDED |
1518 | static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, | |
1519 | unsigned long address) | |
1520 | { | |
1521 | return 0; | |
1522 | } | |
1523 | #else | |
1bb3630e | 1524 | int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); |
5f22df00 NP |
1525 | #endif |
1526 | ||
2d2f5119 | 1527 | #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU) |
5f22df00 NP |
1528 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, |
1529 | unsigned long address) | |
1530 | { | |
1531 | return 0; | |
1532 | } | |
dc6c9a35 | 1533 | |
2d2f5119 KS |
1534 | static inline void mm_nr_pmds_init(struct mm_struct *mm) {} |
1535 | ||
dc6c9a35 KS |
1536 | static inline unsigned long mm_nr_pmds(struct mm_struct *mm) |
1537 | { | |
1538 | return 0; | |
1539 | } | |
1540 | ||
1541 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) {} | |
1542 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) {} | |
1543 | ||
5f22df00 | 1544 | #else |
1bb3630e | 1545 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
dc6c9a35 | 1546 | |
2d2f5119 KS |
1547 | static inline void mm_nr_pmds_init(struct mm_struct *mm) |
1548 | { | |
1549 | atomic_long_set(&mm->nr_pmds, 0); | |
1550 | } | |
1551 | ||
dc6c9a35 KS |
1552 | static inline unsigned long mm_nr_pmds(struct mm_struct *mm) |
1553 | { | |
1554 | return atomic_long_read(&mm->nr_pmds); | |
1555 | } | |
1556 | ||
1557 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) | |
1558 | { | |
1559 | atomic_long_inc(&mm->nr_pmds); | |
1560 | } | |
1561 | ||
1562 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) | |
1563 | { | |
1564 | atomic_long_dec(&mm->nr_pmds); | |
1565 | } | |
5f22df00 NP |
1566 | #endif |
1567 | ||
3ed3a4f0 | 1568 | int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address); |
1bb3630e HD |
1569 | int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); |
1570 | ||
1da177e4 LT |
1571 | /* |
1572 | * The following ifdef needed to get the 4level-fixup.h header to work. | |
1573 | * Remove it when 4level-fixup.h has been removed. | |
1574 | */ | |
1bb3630e | 1575 | #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) |
1da177e4 LT |
1576 | static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) |
1577 | { | |
1bb3630e HD |
1578 | return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))? |
1579 | NULL: pud_offset(pgd, address); | |
1da177e4 LT |
1580 | } |
1581 | ||
1582 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) | |
1583 | { | |
1bb3630e HD |
1584 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
1585 | NULL: pmd_offset(pud, address); | |
1da177e4 | 1586 | } |
1bb3630e HD |
1587 | #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ |
1588 | ||
57c1ffce | 1589 | #if USE_SPLIT_PTE_PTLOCKS |
597d795a | 1590 | #if ALLOC_SPLIT_PTLOCKS |
b35f1819 | 1591 | void __init ptlock_cache_init(void); |
539edb58 PZ |
1592 | extern bool ptlock_alloc(struct page *page); |
1593 | extern void ptlock_free(struct page *page); | |
1594 | ||
1595 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
1596 | { | |
1597 | return page->ptl; | |
1598 | } | |
597d795a | 1599 | #else /* ALLOC_SPLIT_PTLOCKS */ |
b35f1819 KS |
1600 | static inline void ptlock_cache_init(void) |
1601 | { | |
1602 | } | |
1603 | ||
49076ec2 KS |
1604 | static inline bool ptlock_alloc(struct page *page) |
1605 | { | |
49076ec2 KS |
1606 | return true; |
1607 | } | |
539edb58 | 1608 | |
49076ec2 KS |
1609 | static inline void ptlock_free(struct page *page) |
1610 | { | |
49076ec2 KS |
1611 | } |
1612 | ||
1613 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
1614 | { | |
539edb58 | 1615 | return &page->ptl; |
49076ec2 | 1616 | } |
597d795a | 1617 | #endif /* ALLOC_SPLIT_PTLOCKS */ |
49076ec2 KS |
1618 | |
1619 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) | |
1620 | { | |
1621 | return ptlock_ptr(pmd_page(*pmd)); | |
1622 | } | |
1623 | ||
1624 | static inline bool ptlock_init(struct page *page) | |
1625 | { | |
1626 | /* | |
1627 | * prep_new_page() initialize page->private (and therefore page->ptl) | |
1628 | * with 0. Make sure nobody took it in use in between. | |
1629 | * | |
1630 | * It can happen if arch try to use slab for page table allocation: | |
1d798ca3 | 1631 | * slab code uses page->slab_cache, which share storage with page->ptl. |
49076ec2 | 1632 | */ |
309381fe | 1633 | VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page); |
49076ec2 KS |
1634 | if (!ptlock_alloc(page)) |
1635 | return false; | |
1636 | spin_lock_init(ptlock_ptr(page)); | |
1637 | return true; | |
1638 | } | |
1639 | ||
1640 | /* Reset page->mapping so free_pages_check won't complain. */ | |
1641 | static inline void pte_lock_deinit(struct page *page) | |
1642 | { | |
1643 | page->mapping = NULL; | |
1644 | ptlock_free(page); | |
1645 | } | |
1646 | ||
57c1ffce | 1647 | #else /* !USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 HD |
1648 | /* |
1649 | * We use mm->page_table_lock to guard all pagetable pages of the mm. | |
1650 | */ | |
49076ec2 KS |
1651 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1652 | { | |
1653 | return &mm->page_table_lock; | |
1654 | } | |
b35f1819 | 1655 | static inline void ptlock_cache_init(void) {} |
49076ec2 KS |
1656 | static inline bool ptlock_init(struct page *page) { return true; } |
1657 | static inline void pte_lock_deinit(struct page *page) {} | |
57c1ffce | 1658 | #endif /* USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 | 1659 | |
b35f1819 KS |
1660 | static inline void pgtable_init(void) |
1661 | { | |
1662 | ptlock_cache_init(); | |
1663 | pgtable_cache_init(); | |
1664 | } | |
1665 | ||
390f44e2 | 1666 | static inline bool pgtable_page_ctor(struct page *page) |
2f569afd | 1667 | { |
706874e9 VD |
1668 | if (!ptlock_init(page)) |
1669 | return false; | |
2f569afd | 1670 | inc_zone_page_state(page, NR_PAGETABLE); |
706874e9 | 1671 | return true; |
2f569afd MS |
1672 | } |
1673 | ||
1674 | static inline void pgtable_page_dtor(struct page *page) | |
1675 | { | |
1676 | pte_lock_deinit(page); | |
1677 | dec_zone_page_state(page, NR_PAGETABLE); | |
1678 | } | |
1679 | ||
c74df32c HD |
1680 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
1681 | ({ \ | |
4c21e2f2 | 1682 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
c74df32c HD |
1683 | pte_t *__pte = pte_offset_map(pmd, address); \ |
1684 | *(ptlp) = __ptl; \ | |
1685 | spin_lock(__ptl); \ | |
1686 | __pte; \ | |
1687 | }) | |
1688 | ||
1689 | #define pte_unmap_unlock(pte, ptl) do { \ | |
1690 | spin_unlock(ptl); \ | |
1691 | pte_unmap(pte); \ | |
1692 | } while (0) | |
1693 | ||
3ed3a4f0 KS |
1694 | #define pte_alloc(mm, pmd, address) \ |
1695 | (unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, pmd, address)) | |
1696 | ||
1697 | #define pte_alloc_map(mm, pmd, address) \ | |
1698 | (pte_alloc(mm, pmd, address) ? NULL : pte_offset_map(pmd, address)) | |
1bb3630e | 1699 | |
c74df32c | 1700 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
3ed3a4f0 KS |
1701 | (pte_alloc(mm, pmd, address) ? \ |
1702 | NULL : pte_offset_map_lock(mm, pmd, address, ptlp)) | |
c74df32c | 1703 | |
1bb3630e | 1704 | #define pte_alloc_kernel(pmd, address) \ |
8ac1f832 | 1705 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ |
1bb3630e | 1706 | NULL: pte_offset_kernel(pmd, address)) |
1da177e4 | 1707 | |
e009bb30 KS |
1708 | #if USE_SPLIT_PMD_PTLOCKS |
1709 | ||
634391ac MS |
1710 | static struct page *pmd_to_page(pmd_t *pmd) |
1711 | { | |
1712 | unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1); | |
1713 | return virt_to_page((void *)((unsigned long) pmd & mask)); | |
1714 | } | |
1715 | ||
e009bb30 KS |
1716 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1717 | { | |
634391ac | 1718 | return ptlock_ptr(pmd_to_page(pmd)); |
e009bb30 KS |
1719 | } |
1720 | ||
1721 | static inline bool pgtable_pmd_page_ctor(struct page *page) | |
1722 | { | |
e009bb30 KS |
1723 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1724 | page->pmd_huge_pte = NULL; | |
1725 | #endif | |
49076ec2 | 1726 | return ptlock_init(page); |
e009bb30 KS |
1727 | } |
1728 | ||
1729 | static inline void pgtable_pmd_page_dtor(struct page *page) | |
1730 | { | |
1731 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
309381fe | 1732 | VM_BUG_ON_PAGE(page->pmd_huge_pte, page); |
e009bb30 | 1733 | #endif |
49076ec2 | 1734 | ptlock_free(page); |
e009bb30 KS |
1735 | } |
1736 | ||
634391ac | 1737 | #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte) |
e009bb30 KS |
1738 | |
1739 | #else | |
1740 | ||
9a86cb7b KS |
1741 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1742 | { | |
1743 | return &mm->page_table_lock; | |
1744 | } | |
1745 | ||
e009bb30 KS |
1746 | static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; } |
1747 | static inline void pgtable_pmd_page_dtor(struct page *page) {} | |
1748 | ||
c389a250 | 1749 | #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) |
9a86cb7b | 1750 | |
e009bb30 KS |
1751 | #endif |
1752 | ||
9a86cb7b KS |
1753 | static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) |
1754 | { | |
1755 | spinlock_t *ptl = pmd_lockptr(mm, pmd); | |
1756 | spin_lock(ptl); | |
1757 | return ptl; | |
1758 | } | |
1759 | ||
1da177e4 | 1760 | extern void free_area_init(unsigned long * zones_size); |
9109fb7b JW |
1761 | extern void free_area_init_node(int nid, unsigned long * zones_size, |
1762 | unsigned long zone_start_pfn, unsigned long *zholes_size); | |
49a7f04a DH |
1763 | extern void free_initmem(void); |
1764 | ||
69afade7 JL |
1765 | /* |
1766 | * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) | |
1767 | * into the buddy system. The freed pages will be poisoned with pattern | |
dbe67df4 | 1768 | * "poison" if it's within range [0, UCHAR_MAX]. |
69afade7 JL |
1769 | * Return pages freed into the buddy system. |
1770 | */ | |
11199692 | 1771 | extern unsigned long free_reserved_area(void *start, void *end, |
69afade7 | 1772 | int poison, char *s); |
c3d5f5f0 | 1773 | |
cfa11e08 JL |
1774 | #ifdef CONFIG_HIGHMEM |
1775 | /* | |
1776 | * Free a highmem page into the buddy system, adjusting totalhigh_pages | |
1777 | * and totalram_pages. | |
1778 | */ | |
1779 | extern void free_highmem_page(struct page *page); | |
1780 | #endif | |
69afade7 | 1781 | |
c3d5f5f0 | 1782 | extern void adjust_managed_page_count(struct page *page, long count); |
7ee3d4e8 | 1783 | extern void mem_init_print_info(const char *str); |
69afade7 | 1784 | |
92923ca3 NZ |
1785 | extern void reserve_bootmem_region(unsigned long start, unsigned long end); |
1786 | ||
69afade7 JL |
1787 | /* Free the reserved page into the buddy system, so it gets managed. */ |
1788 | static inline void __free_reserved_page(struct page *page) | |
1789 | { | |
1790 | ClearPageReserved(page); | |
1791 | init_page_count(page); | |
1792 | __free_page(page); | |
1793 | } | |
1794 | ||
1795 | static inline void free_reserved_page(struct page *page) | |
1796 | { | |
1797 | __free_reserved_page(page); | |
1798 | adjust_managed_page_count(page, 1); | |
1799 | } | |
1800 | ||
1801 | static inline void mark_page_reserved(struct page *page) | |
1802 | { | |
1803 | SetPageReserved(page); | |
1804 | adjust_managed_page_count(page, -1); | |
1805 | } | |
1806 | ||
1807 | /* | |
1808 | * Default method to free all the __init memory into the buddy system. | |
dbe67df4 JL |
1809 | * The freed pages will be poisoned with pattern "poison" if it's within |
1810 | * range [0, UCHAR_MAX]. | |
1811 | * Return pages freed into the buddy system. | |
69afade7 JL |
1812 | */ |
1813 | static inline unsigned long free_initmem_default(int poison) | |
1814 | { | |
1815 | extern char __init_begin[], __init_end[]; | |
1816 | ||
11199692 | 1817 | return free_reserved_area(&__init_begin, &__init_end, |
69afade7 JL |
1818 | poison, "unused kernel"); |
1819 | } | |
1820 | ||
7ee3d4e8 JL |
1821 | static inline unsigned long get_num_physpages(void) |
1822 | { | |
1823 | int nid; | |
1824 | unsigned long phys_pages = 0; | |
1825 | ||
1826 | for_each_online_node(nid) | |
1827 | phys_pages += node_present_pages(nid); | |
1828 | ||
1829 | return phys_pages; | |
1830 | } | |
1831 | ||
0ee332c1 | 1832 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
c713216d | 1833 | /* |
0ee332c1 | 1834 | * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its |
c713216d MG |
1835 | * zones, allocate the backing mem_map and account for memory holes in a more |
1836 | * architecture independent manner. This is a substitute for creating the | |
1837 | * zone_sizes[] and zholes_size[] arrays and passing them to | |
1838 | * free_area_init_node() | |
1839 | * | |
1840 | * An architecture is expected to register range of page frames backed by | |
0ee332c1 | 1841 | * physical memory with memblock_add[_node]() before calling |
c713216d MG |
1842 | * free_area_init_nodes() passing in the PFN each zone ends at. At a basic |
1843 | * usage, an architecture is expected to do something like | |
1844 | * | |
1845 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, | |
1846 | * max_highmem_pfn}; | |
1847 | * for_each_valid_physical_page_range() | |
0ee332c1 | 1848 | * memblock_add_node(base, size, nid) |
c713216d MG |
1849 | * free_area_init_nodes(max_zone_pfns); |
1850 | * | |
0ee332c1 TH |
1851 | * free_bootmem_with_active_regions() calls free_bootmem_node() for each |
1852 | * registered physical page range. Similarly | |
1853 | * sparse_memory_present_with_active_regions() calls memory_present() for | |
1854 | * each range when SPARSEMEM is enabled. | |
c713216d MG |
1855 | * |
1856 | * See mm/page_alloc.c for more information on each function exposed by | |
0ee332c1 | 1857 | * CONFIG_HAVE_MEMBLOCK_NODE_MAP. |
c713216d MG |
1858 | */ |
1859 | extern void free_area_init_nodes(unsigned long *max_zone_pfn); | |
1e01979c | 1860 | unsigned long node_map_pfn_alignment(void); |
32996250 YL |
1861 | unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, |
1862 | unsigned long end_pfn); | |
c713216d MG |
1863 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
1864 | unsigned long end_pfn); | |
1865 | extern void get_pfn_range_for_nid(unsigned int nid, | |
1866 | unsigned long *start_pfn, unsigned long *end_pfn); | |
1867 | extern unsigned long find_min_pfn_with_active_regions(void); | |
c713216d MG |
1868 | extern void free_bootmem_with_active_regions(int nid, |
1869 | unsigned long max_low_pfn); | |
1870 | extern void sparse_memory_present_with_active_regions(int nid); | |
f2dbcfa7 | 1871 | |
0ee332c1 | 1872 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
f2dbcfa7 | 1873 | |
0ee332c1 | 1874 | #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \ |
f2dbcfa7 | 1875 | !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) |
8a942fde MG |
1876 | static inline int __early_pfn_to_nid(unsigned long pfn, |
1877 | struct mminit_pfnnid_cache *state) | |
f2dbcfa7 KH |
1878 | { |
1879 | return 0; | |
1880 | } | |
1881 | #else | |
1882 | /* please see mm/page_alloc.c */ | |
1883 | extern int __meminit early_pfn_to_nid(unsigned long pfn); | |
f2dbcfa7 | 1884 | /* there is a per-arch backend function. */ |
8a942fde MG |
1885 | extern int __meminit __early_pfn_to_nid(unsigned long pfn, |
1886 | struct mminit_pfnnid_cache *state); | |
f2dbcfa7 KH |
1887 | #endif |
1888 | ||
0e0b864e | 1889 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
a2f3aa02 DH |
1890 | extern void memmap_init_zone(unsigned long, int, unsigned long, |
1891 | unsigned long, enum memmap_context); | |
bc75d33f | 1892 | extern void setup_per_zone_wmarks(void); |
1b79acc9 | 1893 | extern int __meminit init_per_zone_wmark_min(void); |
1da177e4 | 1894 | extern void mem_init(void); |
8feae131 | 1895 | extern void __init mmap_init(void); |
b2b755b5 | 1896 | extern void show_mem(unsigned int flags); |
d02bd27b | 1897 | extern long si_mem_available(void); |
1da177e4 LT |
1898 | extern void si_meminfo(struct sysinfo * val); |
1899 | extern void si_meminfo_node(struct sysinfo *val, int nid); | |
1900 | ||
3ee9a4f0 | 1901 | extern __printf(3, 4) |
d00181b9 KS |
1902 | void warn_alloc_failed(gfp_t gfp_mask, unsigned int order, |
1903 | const char *fmt, ...); | |
a238ab5b | 1904 | |
e7c8d5c9 | 1905 | extern void setup_per_cpu_pageset(void); |
e7c8d5c9 | 1906 | |
112067f0 | 1907 | extern void zone_pcp_update(struct zone *zone); |
340175b7 | 1908 | extern void zone_pcp_reset(struct zone *zone); |
112067f0 | 1909 | |
75f7ad8e PS |
1910 | /* page_alloc.c */ |
1911 | extern int min_free_kbytes; | |
795ae7a0 | 1912 | extern int watermark_scale_factor; |
75f7ad8e | 1913 | |
8feae131 | 1914 | /* nommu.c */ |
33e5d769 | 1915 | extern atomic_long_t mmap_pages_allocated; |
7e660872 | 1916 | extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); |
8feae131 | 1917 | |
6b2dbba8 | 1918 | /* interval_tree.c */ |
6b2dbba8 ML |
1919 | void vma_interval_tree_insert(struct vm_area_struct *node, |
1920 | struct rb_root *root); | |
9826a516 ML |
1921 | void vma_interval_tree_insert_after(struct vm_area_struct *node, |
1922 | struct vm_area_struct *prev, | |
1923 | struct rb_root *root); | |
6b2dbba8 ML |
1924 | void vma_interval_tree_remove(struct vm_area_struct *node, |
1925 | struct rb_root *root); | |
1926 | struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root, | |
1927 | unsigned long start, unsigned long last); | |
1928 | struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node, | |
1929 | unsigned long start, unsigned long last); | |
1930 | ||
1931 | #define vma_interval_tree_foreach(vma, root, start, last) \ | |
1932 | for (vma = vma_interval_tree_iter_first(root, start, last); \ | |
1933 | vma; vma = vma_interval_tree_iter_next(vma, start, last)) | |
1da177e4 | 1934 | |
bf181b9f ML |
1935 | void anon_vma_interval_tree_insert(struct anon_vma_chain *node, |
1936 | struct rb_root *root); | |
1937 | void anon_vma_interval_tree_remove(struct anon_vma_chain *node, | |
1938 | struct rb_root *root); | |
1939 | struct anon_vma_chain *anon_vma_interval_tree_iter_first( | |
1940 | struct rb_root *root, unsigned long start, unsigned long last); | |
1941 | struct anon_vma_chain *anon_vma_interval_tree_iter_next( | |
1942 | struct anon_vma_chain *node, unsigned long start, unsigned long last); | |
ed8ea815 ML |
1943 | #ifdef CONFIG_DEBUG_VM_RB |
1944 | void anon_vma_interval_tree_verify(struct anon_vma_chain *node); | |
1945 | #endif | |
bf181b9f ML |
1946 | |
1947 | #define anon_vma_interval_tree_foreach(avc, root, start, last) \ | |
1948 | for (avc = anon_vma_interval_tree_iter_first(root, start, last); \ | |
1949 | avc; avc = anon_vma_interval_tree_iter_next(avc, start, last)) | |
1950 | ||
1da177e4 | 1951 | /* mmap.c */ |
34b4e4aa | 1952 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
5beb4930 | 1953 | extern int vma_adjust(struct vm_area_struct *vma, unsigned long start, |
1da177e4 LT |
1954 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert); |
1955 | extern struct vm_area_struct *vma_merge(struct mm_struct *, | |
1956 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, | |
1957 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, | |
19a809af | 1958 | struct mempolicy *, struct vm_userfaultfd_ctx); |
1da177e4 LT |
1959 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); |
1960 | extern int split_vma(struct mm_struct *, | |
1961 | struct vm_area_struct *, unsigned long addr, int new_below); | |
1962 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); | |
1963 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, | |
1964 | struct rb_node **, struct rb_node *); | |
a8fb5618 | 1965 | extern void unlink_file_vma(struct vm_area_struct *); |
1da177e4 | 1966 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
38a76013 ML |
1967 | unsigned long addr, unsigned long len, pgoff_t pgoff, |
1968 | bool *need_rmap_locks); | |
1da177e4 | 1969 | extern void exit_mmap(struct mm_struct *); |
925d1c40 | 1970 | |
9c599024 CG |
1971 | static inline int check_data_rlimit(unsigned long rlim, |
1972 | unsigned long new, | |
1973 | unsigned long start, | |
1974 | unsigned long end_data, | |
1975 | unsigned long start_data) | |
1976 | { | |
1977 | if (rlim < RLIM_INFINITY) { | |
1978 | if (((new - start) + (end_data - start_data)) > rlim) | |
1979 | return -ENOSPC; | |
1980 | } | |
1981 | ||
1982 | return 0; | |
1983 | } | |
1984 | ||
7906d00c AA |
1985 | extern int mm_take_all_locks(struct mm_struct *mm); |
1986 | extern void mm_drop_all_locks(struct mm_struct *mm); | |
1987 | ||
38646013 JS |
1988 | extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
1989 | extern struct file *get_mm_exe_file(struct mm_struct *mm); | |
925d1c40 | 1990 | |
84638335 KK |
1991 | extern bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long npages); |
1992 | extern void vm_stat_account(struct mm_struct *, vm_flags_t, long npages); | |
1993 | ||
3935ed6a SS |
1994 | extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm, |
1995 | unsigned long addr, unsigned long len, | |
a62c34bd AL |
1996 | unsigned long flags, |
1997 | const struct vm_special_mapping *spec); | |
1998 | /* This is an obsolete alternative to _install_special_mapping. */ | |
fa5dc22f RM |
1999 | extern int install_special_mapping(struct mm_struct *mm, |
2000 | unsigned long addr, unsigned long len, | |
2001 | unsigned long flags, struct page **pages); | |
1da177e4 LT |
2002 | |
2003 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
2004 | ||
0165ab44 | 2005 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
c22c0d63 | 2006 | unsigned long len, vm_flags_t vm_flags, unsigned long pgoff); |
1fcfd8db | 2007 | extern unsigned long do_mmap(struct file *file, unsigned long addr, |
bebeb3d6 | 2008 | unsigned long len, unsigned long prot, unsigned long flags, |
1fcfd8db | 2009 | vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate); |
1da177e4 LT |
2010 | extern int do_munmap(struct mm_struct *, unsigned long, size_t); |
2011 | ||
1fcfd8db ON |
2012 | static inline unsigned long |
2013 | do_mmap_pgoff(struct file *file, unsigned long addr, | |
2014 | unsigned long len, unsigned long prot, unsigned long flags, | |
2015 | unsigned long pgoff, unsigned long *populate) | |
2016 | { | |
2017 | return do_mmap(file, addr, len, prot, flags, 0, pgoff, populate); | |
2018 | } | |
2019 | ||
bebeb3d6 ML |
2020 | #ifdef CONFIG_MMU |
2021 | extern int __mm_populate(unsigned long addr, unsigned long len, | |
2022 | int ignore_errors); | |
2023 | static inline void mm_populate(unsigned long addr, unsigned long len) | |
2024 | { | |
2025 | /* Ignore errors */ | |
2026 | (void) __mm_populate(addr, len, 1); | |
2027 | } | |
2028 | #else | |
2029 | static inline void mm_populate(unsigned long addr, unsigned long len) {} | |
2030 | #endif | |
2031 | ||
e4eb1ff6 LT |
2032 | /* These take the mm semaphore themselves */ |
2033 | extern unsigned long vm_brk(unsigned long, unsigned long); | |
bfce281c | 2034 | extern int vm_munmap(unsigned long, size_t); |
6be5ceb0 LT |
2035 | extern unsigned long vm_mmap(struct file *, unsigned long, |
2036 | unsigned long, unsigned long, | |
2037 | unsigned long, unsigned long); | |
1da177e4 | 2038 | |
db4fbfb9 ML |
2039 | struct vm_unmapped_area_info { |
2040 | #define VM_UNMAPPED_AREA_TOPDOWN 1 | |
2041 | unsigned long flags; | |
2042 | unsigned long length; | |
2043 | unsigned long low_limit; | |
2044 | unsigned long high_limit; | |
2045 | unsigned long align_mask; | |
2046 | unsigned long align_offset; | |
2047 | }; | |
2048 | ||
2049 | extern unsigned long unmapped_area(struct vm_unmapped_area_info *info); | |
2050 | extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info); | |
2051 | ||
2052 | /* | |
2053 | * Search for an unmapped address range. | |
2054 | * | |
2055 | * We are looking for a range that: | |
2056 | * - does not intersect with any VMA; | |
2057 | * - is contained within the [low_limit, high_limit) interval; | |
2058 | * - is at least the desired size. | |
2059 | * - satisfies (begin_addr & align_mask) == (align_offset & align_mask) | |
2060 | */ | |
2061 | static inline unsigned long | |
2062 | vm_unmapped_area(struct vm_unmapped_area_info *info) | |
2063 | { | |
cdd7875e | 2064 | if (info->flags & VM_UNMAPPED_AREA_TOPDOWN) |
db4fbfb9 | 2065 | return unmapped_area_topdown(info); |
cdd7875e BP |
2066 | else |
2067 | return unmapped_area(info); | |
db4fbfb9 ML |
2068 | } |
2069 | ||
85821aab | 2070 | /* truncate.c */ |
1da177e4 | 2071 | extern void truncate_inode_pages(struct address_space *, loff_t); |
d7339071 HR |
2072 | extern void truncate_inode_pages_range(struct address_space *, |
2073 | loff_t lstart, loff_t lend); | |
91b0abe3 | 2074 | extern void truncate_inode_pages_final(struct address_space *); |
1da177e4 LT |
2075 | |
2076 | /* generic vm_area_ops exported for stackable file systems */ | |
d0217ac0 | 2077 | extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); |
f1820361 | 2078 | extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf); |
4fcf1c62 | 2079 | extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); |
1da177e4 LT |
2080 | |
2081 | /* mm/page-writeback.c */ | |
2082 | int write_one_page(struct page *page, int wait); | |
1cf6e7d8 | 2083 | void task_dirty_inc(struct task_struct *tsk); |
1da177e4 LT |
2084 | |
2085 | /* readahead.c */ | |
2086 | #define VM_MAX_READAHEAD 128 /* kbytes */ | |
2087 | #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ | |
1da177e4 | 2088 | |
1da177e4 | 2089 | int force_page_cache_readahead(struct address_space *mapping, struct file *filp, |
7361f4d8 | 2090 | pgoff_t offset, unsigned long nr_to_read); |
cf914a7d RR |
2091 | |
2092 | void page_cache_sync_readahead(struct address_space *mapping, | |
2093 | struct file_ra_state *ra, | |
2094 | struct file *filp, | |
2095 | pgoff_t offset, | |
2096 | unsigned long size); | |
2097 | ||
2098 | void page_cache_async_readahead(struct address_space *mapping, | |
2099 | struct file_ra_state *ra, | |
2100 | struct file *filp, | |
2101 | struct page *pg, | |
2102 | pgoff_t offset, | |
2103 | unsigned long size); | |
2104 | ||
d05f3169 | 2105 | /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ |
46dea3d0 | 2106 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
d05f3169 MH |
2107 | |
2108 | /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */ | |
2109 | extern int expand_downwards(struct vm_area_struct *vma, | |
2110 | unsigned long address); | |
8ca3eb08 | 2111 | #if VM_GROWSUP |
46dea3d0 | 2112 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
8ca3eb08 | 2113 | #else |
fee7e49d | 2114 | #define expand_upwards(vma, address) (0) |
9ab88515 | 2115 | #endif |
1da177e4 LT |
2116 | |
2117 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ | |
2118 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); | |
2119 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, | |
2120 | struct vm_area_struct **pprev); | |
2121 | ||
2122 | /* Look up the first VMA which intersects the interval start_addr..end_addr-1, | |
2123 | NULL if none. Assume start_addr < end_addr. */ | |
2124 | static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) | |
2125 | { | |
2126 | struct vm_area_struct * vma = find_vma(mm,start_addr); | |
2127 | ||
2128 | if (vma && end_addr <= vma->vm_start) | |
2129 | vma = NULL; | |
2130 | return vma; | |
2131 | } | |
2132 | ||
2133 | static inline unsigned long vma_pages(struct vm_area_struct *vma) | |
2134 | { | |
2135 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
2136 | } | |
2137 | ||
640708a2 PE |
2138 | /* Look up the first VMA which exactly match the interval vm_start ... vm_end */ |
2139 | static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, | |
2140 | unsigned long vm_start, unsigned long vm_end) | |
2141 | { | |
2142 | struct vm_area_struct *vma = find_vma(mm, vm_start); | |
2143 | ||
2144 | if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end)) | |
2145 | vma = NULL; | |
2146 | ||
2147 | return vma; | |
2148 | } | |
2149 | ||
bad849b3 | 2150 | #ifdef CONFIG_MMU |
804af2cf | 2151 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
64e45507 | 2152 | void vma_set_page_prot(struct vm_area_struct *vma); |
bad849b3 DH |
2153 | #else |
2154 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) | |
2155 | { | |
2156 | return __pgprot(0); | |
2157 | } | |
64e45507 PF |
2158 | static inline void vma_set_page_prot(struct vm_area_struct *vma) |
2159 | { | |
2160 | vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); | |
2161 | } | |
bad849b3 DH |
2162 | #endif |
2163 | ||
5877231f | 2164 | #ifdef CONFIG_NUMA_BALANCING |
4b10e7d5 | 2165 | unsigned long change_prot_numa(struct vm_area_struct *vma, |
b24f53a0 LS |
2166 | unsigned long start, unsigned long end); |
2167 | #endif | |
2168 | ||
deceb6cd | 2169 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
deceb6cd HD |
2170 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
2171 | unsigned long pfn, unsigned long size, pgprot_t); | |
a145dd41 | 2172 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
e0dc0d8f NP |
2173 | int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
2174 | unsigned long pfn); | |
1745cbc5 AL |
2175 | int vm_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr, |
2176 | unsigned long pfn, pgprot_t pgprot); | |
423bad60 | 2177 | int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
01c8f1c4 | 2178 | pfn_t pfn); |
b4cbb197 LT |
2179 | int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len); |
2180 | ||
deceb6cd | 2181 | |
240aadee ML |
2182 | struct page *follow_page_mask(struct vm_area_struct *vma, |
2183 | unsigned long address, unsigned int foll_flags, | |
2184 | unsigned int *page_mask); | |
2185 | ||
2186 | static inline struct page *follow_page(struct vm_area_struct *vma, | |
2187 | unsigned long address, unsigned int foll_flags) | |
2188 | { | |
2189 | unsigned int unused_page_mask; | |
2190 | return follow_page_mask(vma, address, foll_flags, &unused_page_mask); | |
2191 | } | |
2192 | ||
deceb6cd HD |
2193 | #define FOLL_WRITE 0x01 /* check pte is writable */ |
2194 | #define FOLL_TOUCH 0x02 /* mark page accessed */ | |
2195 | #define FOLL_GET 0x04 /* do get_page on page */ | |
8e4b9a60 | 2196 | #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ |
58fa879e | 2197 | #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ |
318b275f GN |
2198 | #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO |
2199 | * and return without waiting upon it */ | |
84d33df2 | 2200 | #define FOLL_POPULATE 0x40 /* fault in page */ |
500d65d4 | 2201 | #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */ |
69ebb83e | 2202 | #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */ |
0b9d7052 | 2203 | #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */ |
5117b3b8 | 2204 | #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */ |
234b239b | 2205 | #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */ |
de60f5f1 | 2206 | #define FOLL_MLOCK 0x1000 /* lock present pages */ |
1e987790 | 2207 | #define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */ |
1da177e4 | 2208 | |
2f569afd | 2209 | typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, |
aee16b3c JF |
2210 | void *data); |
2211 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, | |
2212 | unsigned long size, pte_fn_t fn, void *data); | |
2213 | ||
1da177e4 | 2214 | |
8823b1db LA |
2215 | #ifdef CONFIG_PAGE_POISONING |
2216 | extern bool page_poisoning_enabled(void); | |
2217 | extern void kernel_poison_pages(struct page *page, int numpages, int enable); | |
1414c7f4 | 2218 | extern bool page_is_poisoned(struct page *page); |
8823b1db LA |
2219 | #else |
2220 | static inline bool page_poisoning_enabled(void) { return false; } | |
2221 | static inline void kernel_poison_pages(struct page *page, int numpages, | |
2222 | int enable) { } | |
1414c7f4 | 2223 | static inline bool page_is_poisoned(struct page *page) { return false; } |
8823b1db LA |
2224 | #endif |
2225 | ||
12d6f21e | 2226 | #ifdef CONFIG_DEBUG_PAGEALLOC |
031bc574 JK |
2227 | extern bool _debug_pagealloc_enabled; |
2228 | extern void __kernel_map_pages(struct page *page, int numpages, int enable); | |
2229 | ||
2230 | static inline bool debug_pagealloc_enabled(void) | |
2231 | { | |
2232 | return _debug_pagealloc_enabled; | |
2233 | } | |
2234 | ||
2235 | static inline void | |
2236 | kernel_map_pages(struct page *page, int numpages, int enable) | |
2237 | { | |
2238 | if (!debug_pagealloc_enabled()) | |
2239 | return; | |
2240 | ||
2241 | __kernel_map_pages(page, numpages, enable); | |
2242 | } | |
8a235efa RW |
2243 | #ifdef CONFIG_HIBERNATION |
2244 | extern bool kernel_page_present(struct page *page); | |
40b44137 JK |
2245 | #endif /* CONFIG_HIBERNATION */ |
2246 | #else /* CONFIG_DEBUG_PAGEALLOC */ | |
1da177e4 | 2247 | static inline void |
9858db50 | 2248 | kernel_map_pages(struct page *page, int numpages, int enable) {} |
8a235efa RW |
2249 | #ifdef CONFIG_HIBERNATION |
2250 | static inline bool kernel_page_present(struct page *page) { return true; } | |
40b44137 JK |
2251 | #endif /* CONFIG_HIBERNATION */ |
2252 | static inline bool debug_pagealloc_enabled(void) | |
2253 | { | |
2254 | return false; | |
2255 | } | |
2256 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
1da177e4 | 2257 | |
a6c19dfe | 2258 | #ifdef __HAVE_ARCH_GATE_AREA |
31db58b3 | 2259 | extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); |
a6c19dfe AL |
2260 | extern int in_gate_area_no_mm(unsigned long addr); |
2261 | extern int in_gate_area(struct mm_struct *mm, unsigned long addr); | |
1da177e4 | 2262 | #else |
a6c19dfe AL |
2263 | static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
2264 | { | |
2265 | return NULL; | |
2266 | } | |
2267 | static inline int in_gate_area_no_mm(unsigned long addr) { return 0; } | |
2268 | static inline int in_gate_area(struct mm_struct *mm, unsigned long addr) | |
2269 | { | |
2270 | return 0; | |
2271 | } | |
1da177e4 LT |
2272 | #endif /* __HAVE_ARCH_GATE_AREA */ |
2273 | ||
146732ce JT |
2274 | #ifdef CONFIG_SYSCTL |
2275 | extern int sysctl_drop_caches; | |
8d65af78 | 2276 | int drop_caches_sysctl_handler(struct ctl_table *, int, |
9d0243bc | 2277 | void __user *, size_t *, loff_t *); |
146732ce JT |
2278 | #endif |
2279 | ||
cb731d6c VD |
2280 | void drop_slab(void); |
2281 | void drop_slab_node(int nid); | |
9d0243bc | 2282 | |
7a9166e3 LY |
2283 | #ifndef CONFIG_MMU |
2284 | #define randomize_va_space 0 | |
2285 | #else | |
a62eaf15 | 2286 | extern int randomize_va_space; |
7a9166e3 | 2287 | #endif |
a62eaf15 | 2288 | |
045e72ac | 2289 | const char * arch_vma_name(struct vm_area_struct *vma); |
03252919 | 2290 | void print_vma_addr(char *prefix, unsigned long rip); |
e6e5494c | 2291 | |
9bdac914 YL |
2292 | void sparse_mem_maps_populate_node(struct page **map_map, |
2293 | unsigned long pnum_begin, | |
2294 | unsigned long pnum_end, | |
2295 | unsigned long map_count, | |
2296 | int nodeid); | |
2297 | ||
98f3cfc1 | 2298 | struct page *sparse_mem_map_populate(unsigned long pnum, int nid); |
29c71111 AW |
2299 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
2300 | pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node); | |
2301 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); | |
2302 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node); | |
8f6aac41 | 2303 | void *vmemmap_alloc_block(unsigned long size, int node); |
4b94ffdc DW |
2304 | struct vmem_altmap; |
2305 | void *__vmemmap_alloc_block_buf(unsigned long size, int node, | |
2306 | struct vmem_altmap *altmap); | |
2307 | static inline void *vmemmap_alloc_block_buf(unsigned long size, int node) | |
2308 | { | |
2309 | return __vmemmap_alloc_block_buf(size, node, NULL); | |
2310 | } | |
2311 | ||
8f6aac41 | 2312 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
0aad818b JW |
2313 | int vmemmap_populate_basepages(unsigned long start, unsigned long end, |
2314 | int node); | |
2315 | int vmemmap_populate(unsigned long start, unsigned long end, int node); | |
c2b91e2e | 2316 | void vmemmap_populate_print_last(void); |
0197518c | 2317 | #ifdef CONFIG_MEMORY_HOTPLUG |
0aad818b | 2318 | void vmemmap_free(unsigned long start, unsigned long end); |
0197518c | 2319 | #endif |
46723bfa YI |
2320 | void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, |
2321 | unsigned long size); | |
6a46079c | 2322 | |
82ba011b AK |
2323 | enum mf_flags { |
2324 | MF_COUNT_INCREASED = 1 << 0, | |
7329bbeb | 2325 | MF_ACTION_REQUIRED = 1 << 1, |
6751ed65 | 2326 | MF_MUST_KILL = 1 << 2, |
cf870c70 | 2327 | MF_SOFT_OFFLINE = 1 << 3, |
82ba011b | 2328 | }; |
cd42f4a3 | 2329 | extern int memory_failure(unsigned long pfn, int trapno, int flags); |
ea8f5fb8 | 2330 | extern void memory_failure_queue(unsigned long pfn, int trapno, int flags); |
847ce401 | 2331 | extern int unpoison_memory(unsigned long pfn); |
ead07f6a | 2332 | extern int get_hwpoison_page(struct page *page); |
4e41a30c | 2333 | #define put_hwpoison_page(page) put_page(page) |
6a46079c AK |
2334 | extern int sysctl_memory_failure_early_kill; |
2335 | extern int sysctl_memory_failure_recovery; | |
facb6011 | 2336 | extern void shake_page(struct page *p, int access); |
293c07e3 | 2337 | extern atomic_long_t num_poisoned_pages; |
facb6011 | 2338 | extern int soft_offline_page(struct page *page, int flags); |
6a46079c | 2339 | |
cc637b17 XX |
2340 | |
2341 | /* | |
2342 | * Error handlers for various types of pages. | |
2343 | */ | |
cc3e2af4 | 2344 | enum mf_result { |
cc637b17 XX |
2345 | MF_IGNORED, /* Error: cannot be handled */ |
2346 | MF_FAILED, /* Error: handling failed */ | |
2347 | MF_DELAYED, /* Will be handled later */ | |
2348 | MF_RECOVERED, /* Successfully recovered */ | |
2349 | }; | |
2350 | ||
2351 | enum mf_action_page_type { | |
2352 | MF_MSG_KERNEL, | |
2353 | MF_MSG_KERNEL_HIGH_ORDER, | |
2354 | MF_MSG_SLAB, | |
2355 | MF_MSG_DIFFERENT_COMPOUND, | |
2356 | MF_MSG_POISONED_HUGE, | |
2357 | MF_MSG_HUGE, | |
2358 | MF_MSG_FREE_HUGE, | |
2359 | MF_MSG_UNMAP_FAILED, | |
2360 | MF_MSG_DIRTY_SWAPCACHE, | |
2361 | MF_MSG_CLEAN_SWAPCACHE, | |
2362 | MF_MSG_DIRTY_MLOCKED_LRU, | |
2363 | MF_MSG_CLEAN_MLOCKED_LRU, | |
2364 | MF_MSG_DIRTY_UNEVICTABLE_LRU, | |
2365 | MF_MSG_CLEAN_UNEVICTABLE_LRU, | |
2366 | MF_MSG_DIRTY_LRU, | |
2367 | MF_MSG_CLEAN_LRU, | |
2368 | MF_MSG_TRUNCATED_LRU, | |
2369 | MF_MSG_BUDDY, | |
2370 | MF_MSG_BUDDY_2ND, | |
2371 | MF_MSG_UNKNOWN, | |
2372 | }; | |
2373 | ||
47ad8475 AA |
2374 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) |
2375 | extern void clear_huge_page(struct page *page, | |
2376 | unsigned long addr, | |
2377 | unsigned int pages_per_huge_page); | |
2378 | extern void copy_user_huge_page(struct page *dst, struct page *src, | |
2379 | unsigned long addr, struct vm_area_struct *vma, | |
2380 | unsigned int pages_per_huge_page); | |
2381 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ | |
2382 | ||
e30825f1 JK |
2383 | extern struct page_ext_operations debug_guardpage_ops; |
2384 | extern struct page_ext_operations page_poisoning_ops; | |
2385 | ||
c0a32fc5 SG |
2386 | #ifdef CONFIG_DEBUG_PAGEALLOC |
2387 | extern unsigned int _debug_guardpage_minorder; | |
e30825f1 | 2388 | extern bool _debug_guardpage_enabled; |
c0a32fc5 SG |
2389 | |
2390 | static inline unsigned int debug_guardpage_minorder(void) | |
2391 | { | |
2392 | return _debug_guardpage_minorder; | |
2393 | } | |
2394 | ||
e30825f1 JK |
2395 | static inline bool debug_guardpage_enabled(void) |
2396 | { | |
2397 | return _debug_guardpage_enabled; | |
2398 | } | |
2399 | ||
c0a32fc5 SG |
2400 | static inline bool page_is_guard(struct page *page) |
2401 | { | |
e30825f1 JK |
2402 | struct page_ext *page_ext; |
2403 | ||
2404 | if (!debug_guardpage_enabled()) | |
2405 | return false; | |
2406 | ||
2407 | page_ext = lookup_page_ext(page); | |
2408 | return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); | |
c0a32fc5 SG |
2409 | } |
2410 | #else | |
2411 | static inline unsigned int debug_guardpage_minorder(void) { return 0; } | |
e30825f1 | 2412 | static inline bool debug_guardpage_enabled(void) { return false; } |
c0a32fc5 SG |
2413 | static inline bool page_is_guard(struct page *page) { return false; } |
2414 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
2415 | ||
f9872caf CS |
2416 | #if MAX_NUMNODES > 1 |
2417 | void __init setup_nr_node_ids(void); | |
2418 | #else | |
2419 | static inline void setup_nr_node_ids(void) {} | |
2420 | #endif | |
2421 | ||
1da177e4 LT |
2422 | #endif /* __KERNEL__ */ |
2423 | #endif /* _LINUX_MM_H */ |