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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> |
e9da73d6 | 19 | #include <linux/bit_spinlock.h> |
b0d40c92 | 20 | #include <linux/shrinker.h> |
9c599024 | 21 | #include <linux/resource.h> |
e30825f1 | 22 | #include <linux/page_ext.h> |
8025e5dd | 23 | #include <linux/err.h> |
1da177e4 LT |
24 | |
25 | struct mempolicy; | |
26 | struct anon_vma; | |
bf181b9f | 27 | struct anon_vma_chain; |
4e950f6f | 28 | struct file_ra_state; |
e8edc6e0 | 29 | struct user_struct; |
4e950f6f | 30 | struct writeback_control; |
682aa8e1 | 31 | struct bdi_writeback; |
1da177e4 | 32 | |
fccc9987 | 33 | #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */ |
1da177e4 | 34 | extern unsigned long max_mapnr; |
fccc9987 JL |
35 | |
36 | static inline void set_max_mapnr(unsigned long limit) | |
37 | { | |
38 | max_mapnr = limit; | |
39 | } | |
40 | #else | |
41 | static inline void set_max_mapnr(unsigned long limit) { } | |
1da177e4 LT |
42 | #endif |
43 | ||
4481374c | 44 | extern unsigned long totalram_pages; |
1da177e4 | 45 | extern void * high_memory; |
1da177e4 LT |
46 | extern int page_cluster; |
47 | ||
48 | #ifdef CONFIG_SYSCTL | |
49 | extern int sysctl_legacy_va_layout; | |
50 | #else | |
51 | #define sysctl_legacy_va_layout 0 | |
52 | #endif | |
53 | ||
54 | #include <asm/page.h> | |
55 | #include <asm/pgtable.h> | |
56 | #include <asm/processor.h> | |
1da177e4 | 57 | |
79442ed1 TC |
58 | #ifndef __pa_symbol |
59 | #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) | |
60 | #endif | |
61 | ||
593befa6 DD |
62 | /* |
63 | * To prevent common memory management code establishing | |
64 | * a zero page mapping on a read fault. | |
65 | * This macro should be defined within <asm/pgtable.h>. | |
66 | * s390 does this to prevent multiplexing of hardware bits | |
67 | * related to the physical page in case of virtualization. | |
68 | */ | |
69 | #ifndef mm_forbids_zeropage | |
70 | #define mm_forbids_zeropage(X) (0) | |
71 | #endif | |
72 | ||
c9b1d098 | 73 | extern unsigned long sysctl_user_reserve_kbytes; |
4eeab4f5 | 74 | extern unsigned long sysctl_admin_reserve_kbytes; |
c9b1d098 | 75 | |
49f0ce5f JM |
76 | extern int sysctl_overcommit_memory; |
77 | extern int sysctl_overcommit_ratio; | |
78 | extern unsigned long sysctl_overcommit_kbytes; | |
79 | ||
80 | extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *, | |
81 | size_t *, loff_t *); | |
82 | extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *, | |
83 | size_t *, loff_t *); | |
84 | ||
1da177e4 LT |
85 | #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
86 | ||
27ac792c AR |
87 | /* to align the pointer to the (next) page boundary */ |
88 | #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) | |
89 | ||
0fa73b86 AM |
90 | /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */ |
91 | #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)addr, PAGE_SIZE) | |
92 | ||
1da177e4 LT |
93 | /* |
94 | * Linux kernel virtual memory manager primitives. | |
95 | * The idea being to have a "virtual" mm in the same way | |
96 | * we have a virtual fs - giving a cleaner interface to the | |
97 | * mm details, and allowing different kinds of memory mappings | |
98 | * (from shared memory to executable loading to arbitrary | |
99 | * mmap() functions). | |
100 | */ | |
101 | ||
c43692e8 CL |
102 | extern struct kmem_cache *vm_area_cachep; |
103 | ||
1da177e4 | 104 | #ifndef CONFIG_MMU |
8feae131 DH |
105 | extern struct rb_root nommu_region_tree; |
106 | extern struct rw_semaphore nommu_region_sem; | |
1da177e4 LT |
107 | |
108 | extern unsigned int kobjsize(const void *objp); | |
109 | #endif | |
110 | ||
111 | /* | |
605d9288 | 112 | * vm_flags in vm_area_struct, see mm_types.h. |
1da177e4 | 113 | */ |
cc2383ec KK |
114 | #define VM_NONE 0x00000000 |
115 | ||
1da177e4 LT |
116 | #define VM_READ 0x00000001 /* currently active flags */ |
117 | #define VM_WRITE 0x00000002 | |
118 | #define VM_EXEC 0x00000004 | |
119 | #define VM_SHARED 0x00000008 | |
120 | ||
7e2cff42 | 121 | /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
1da177e4 LT |
122 | #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
123 | #define VM_MAYWRITE 0x00000020 | |
124 | #define VM_MAYEXEC 0x00000040 | |
125 | #define VM_MAYSHARE 0x00000080 | |
126 | ||
127 | #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ | |
16ba6f81 | 128 | #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */ |
6aab341e | 129 | #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
1da177e4 | 130 | #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ |
16ba6f81 | 131 | #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */ |
1da177e4 | 132 | |
1da177e4 LT |
133 | #define VM_LOCKED 0x00002000 |
134 | #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ | |
135 | ||
136 | /* Used by sys_madvise() */ | |
137 | #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ | |
138 | #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ | |
139 | ||
140 | #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ | |
141 | #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ | |
de60f5f1 | 142 | #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */ |
1da177e4 | 143 | #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
cdfd4325 | 144 | #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
1da177e4 | 145 | #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
cc2383ec | 146 | #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ |
4aae7e43 | 147 | #define VM_ARCH_2 0x02000000 |
0103bd16 | 148 | #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */ |
d00806b1 | 149 | |
d9104d1c CG |
150 | #ifdef CONFIG_MEM_SOFT_DIRTY |
151 | # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */ | |
152 | #else | |
153 | # define VM_SOFTDIRTY 0 | |
154 | #endif | |
155 | ||
b379d790 | 156 | #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
cc2383ec KK |
157 | #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */ |
158 | #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ | |
f8af4da3 | 159 | #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ |
1da177e4 | 160 | |
cc2383ec KK |
161 | #if defined(CONFIG_X86) |
162 | # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ | |
163 | #elif defined(CONFIG_PPC) | |
164 | # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */ | |
165 | #elif defined(CONFIG_PARISC) | |
166 | # define VM_GROWSUP VM_ARCH_1 | |
9ca52ed9 JH |
167 | #elif defined(CONFIG_METAG) |
168 | # define VM_GROWSUP VM_ARCH_1 | |
cc2383ec KK |
169 | #elif defined(CONFIG_IA64) |
170 | # define VM_GROWSUP VM_ARCH_1 | |
171 | #elif !defined(CONFIG_MMU) | |
172 | # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */ | |
173 | #endif | |
174 | ||
4aae7e43 QR |
175 | #if defined(CONFIG_X86) |
176 | /* MPX specific bounds table or bounds directory */ | |
177 | # define VM_MPX VM_ARCH_2 | |
178 | #endif | |
179 | ||
cc2383ec KK |
180 | #ifndef VM_GROWSUP |
181 | # define VM_GROWSUP VM_NONE | |
182 | #endif | |
183 | ||
a8bef8ff MG |
184 | /* Bits set in the VMA until the stack is in its final location */ |
185 | #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) | |
186 | ||
1da177e4 LT |
187 | #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
188 | #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS | |
189 | #endif | |
190 | ||
191 | #ifdef CONFIG_STACK_GROWSUP | |
192 | #define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) | |
193 | #else | |
194 | #define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) | |
195 | #endif | |
196 | ||
b291f000 | 197 | /* |
78f11a25 AA |
198 | * Special vmas that are non-mergable, non-mlock()able. |
199 | * Note: mm/huge_memory.c VM_NO_THP depends on this definition. | |
b291f000 | 200 | */ |
9050d7eb | 201 | #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP) |
b291f000 | 202 | |
a0715cc2 AT |
203 | /* This mask defines which mm->def_flags a process can inherit its parent */ |
204 | #define VM_INIT_DEF_MASK VM_NOHUGEPAGE | |
205 | ||
de60f5f1 EM |
206 | /* This mask is used to clear all the VMA flags used by mlock */ |
207 | #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT)) | |
208 | ||
1da177e4 LT |
209 | /* |
210 | * mapping from the currently active vm_flags protection bits (the | |
211 | * low four bits) to a page protection mask.. | |
212 | */ | |
213 | extern pgprot_t protection_map[16]; | |
214 | ||
d0217ac0 | 215 | #define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ |
9b4bdd2f KS |
216 | #define FAULT_FLAG_MKWRITE 0x02 /* Fault was mkwrite of existing pte */ |
217 | #define FAULT_FLAG_ALLOW_RETRY 0x04 /* Retry fault if blocking */ | |
218 | #define FAULT_FLAG_RETRY_NOWAIT 0x08 /* Don't drop mmap_sem and wait when retrying */ | |
219 | #define FAULT_FLAG_KILLABLE 0x10 /* The fault task is in SIGKILL killable region */ | |
220 | #define FAULT_FLAG_TRIED 0x20 /* Second try */ | |
221 | #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */ | |
d0217ac0 | 222 | |
54cb8821 | 223 | /* |
d0217ac0 | 224 | * vm_fault is filled by the the pagefault handler and passed to the vma's |
83c54070 NP |
225 | * ->fault function. The vma's ->fault is responsible for returning a bitmask |
226 | * of VM_FAULT_xxx flags that give details about how the fault was handled. | |
54cb8821 | 227 | * |
9b4bdd2f | 228 | * pgoff should be used in favour of virtual_address, if possible. |
54cb8821 | 229 | */ |
d0217ac0 NP |
230 | struct vm_fault { |
231 | unsigned int flags; /* FAULT_FLAG_xxx flags */ | |
232 | pgoff_t pgoff; /* Logical page offset based on vma */ | |
233 | void __user *virtual_address; /* Faulting virtual address */ | |
234 | ||
2e4cdab0 | 235 | struct page *cow_page; /* Handler may choose to COW */ |
d0217ac0 | 236 | struct page *page; /* ->fault handlers should return a |
83c54070 | 237 | * page here, unless VM_FAULT_NOPAGE |
d0217ac0 | 238 | * is set (which is also implied by |
83c54070 | 239 | * VM_FAULT_ERROR). |
d0217ac0 | 240 | */ |
8c6e50b0 KS |
241 | /* for ->map_pages() only */ |
242 | pgoff_t max_pgoff; /* map pages for offset from pgoff till | |
243 | * max_pgoff inclusive */ | |
244 | pte_t *pte; /* pte entry associated with ->pgoff */ | |
54cb8821 | 245 | }; |
1da177e4 LT |
246 | |
247 | /* | |
248 | * These are the virtual MM functions - opening of an area, closing and | |
249 | * unmapping it (needed to keep files on disk up-to-date etc), pointer | |
250 | * to the functions called when a no-page or a wp-page exception occurs. | |
251 | */ | |
252 | struct vm_operations_struct { | |
253 | void (*open)(struct vm_area_struct * area); | |
254 | void (*close)(struct vm_area_struct * area); | |
5477e70a | 255 | int (*mremap)(struct vm_area_struct * area); |
d0217ac0 | 256 | int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); |
b96375f7 MW |
257 | int (*pmd_fault)(struct vm_area_struct *, unsigned long address, |
258 | pmd_t *, unsigned int flags); | |
8c6e50b0 | 259 | void (*map_pages)(struct vm_area_struct *vma, struct vm_fault *vmf); |
9637a5ef DH |
260 | |
261 | /* notification that a previously read-only page is about to become | |
262 | * writable, if an error is returned it will cause a SIGBUS */ | |
c2ec175c | 263 | int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); |
28b2ee20 | 264 | |
dd906184 BH |
265 | /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */ |
266 | int (*pfn_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); | |
267 | ||
28b2ee20 RR |
268 | /* called by access_process_vm when get_user_pages() fails, typically |
269 | * for use by special VMAs that can switch between memory and hardware | |
270 | */ | |
271 | int (*access)(struct vm_area_struct *vma, unsigned long addr, | |
272 | void *buf, int len, int write); | |
78d683e8 AL |
273 | |
274 | /* Called by the /proc/PID/maps code to ask the vma whether it | |
275 | * has a special name. Returning non-NULL will also cause this | |
276 | * vma to be dumped unconditionally. */ | |
277 | const char *(*name)(struct vm_area_struct *vma); | |
278 | ||
1da177e4 | 279 | #ifdef CONFIG_NUMA |
a6020ed7 LS |
280 | /* |
281 | * set_policy() op must add a reference to any non-NULL @new mempolicy | |
282 | * to hold the policy upon return. Caller should pass NULL @new to | |
283 | * remove a policy and fall back to surrounding context--i.e. do not | |
284 | * install a MPOL_DEFAULT policy, nor the task or system default | |
285 | * mempolicy. | |
286 | */ | |
1da177e4 | 287 | int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
a6020ed7 LS |
288 | |
289 | /* | |
290 | * get_policy() op must add reference [mpol_get()] to any policy at | |
291 | * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure | |
292 | * in mm/mempolicy.c will do this automatically. | |
293 | * get_policy() must NOT add a ref if the policy at (vma,addr) is not | |
294 | * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. | |
295 | * If no [shared/vma] mempolicy exists at the addr, get_policy() op | |
296 | * must return NULL--i.e., do not "fallback" to task or system default | |
297 | * policy. | |
298 | */ | |
1da177e4 LT |
299 | struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
300 | unsigned long addr); | |
301 | #endif | |
667a0a06 DV |
302 | /* |
303 | * Called by vm_normal_page() for special PTEs to find the | |
304 | * page for @addr. This is useful if the default behavior | |
305 | * (using pte_page()) would not find the correct page. | |
306 | */ | |
307 | struct page *(*find_special_page)(struct vm_area_struct *vma, | |
308 | unsigned long addr); | |
1da177e4 LT |
309 | }; |
310 | ||
311 | struct mmu_gather; | |
312 | struct inode; | |
313 | ||
349aef0b AM |
314 | #define page_private(page) ((page)->private) |
315 | #define set_page_private(page, v) ((page)->private = (v)) | |
4c21e2f2 | 316 | |
1da177e4 LT |
317 | /* |
318 | * FIXME: take this include out, include page-flags.h in | |
319 | * files which need it (119 of them) | |
320 | */ | |
321 | #include <linux/page-flags.h> | |
71e3aac0 | 322 | #include <linux/huge_mm.h> |
1da177e4 LT |
323 | |
324 | /* | |
325 | * Methods to modify the page usage count. | |
326 | * | |
327 | * What counts for a page usage: | |
328 | * - cache mapping (page->mapping) | |
329 | * - private data (page->private) | |
330 | * - page mapped in a task's page tables, each mapping | |
331 | * is counted separately | |
332 | * | |
333 | * Also, many kernel routines increase the page count before a critical | |
334 | * routine so they can be sure the page doesn't go away from under them. | |
1da177e4 LT |
335 | */ |
336 | ||
337 | /* | |
da6052f7 | 338 | * Drop a ref, return true if the refcount fell to zero (the page has no users) |
1da177e4 | 339 | */ |
7c8ee9a8 NP |
340 | static inline int put_page_testzero(struct page *page) |
341 | { | |
309381fe | 342 | VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0, page); |
8dc04efb | 343 | return atomic_dec_and_test(&page->_count); |
7c8ee9a8 | 344 | } |
1da177e4 LT |
345 | |
346 | /* | |
7c8ee9a8 NP |
347 | * Try to grab a ref unless the page has a refcount of zero, return false if |
348 | * that is the case. | |
8e0861fa AK |
349 | * This can be called when MMU is off so it must not access |
350 | * any of the virtual mappings. | |
1da177e4 | 351 | */ |
7c8ee9a8 NP |
352 | static inline int get_page_unless_zero(struct page *page) |
353 | { | |
8dc04efb | 354 | return atomic_inc_not_zero(&page->_count); |
7c8ee9a8 | 355 | } |
1da177e4 | 356 | |
53df8fdc | 357 | extern int page_is_ram(unsigned long pfn); |
124fe20d DW |
358 | |
359 | enum { | |
360 | REGION_INTERSECTS, | |
361 | REGION_DISJOINT, | |
362 | REGION_MIXED, | |
363 | }; | |
364 | ||
365 | int region_intersects(resource_size_t offset, size_t size, const char *type); | |
53df8fdc | 366 | |
48667e7a | 367 | /* Support for virtually mapped pages */ |
b3bdda02 CL |
368 | struct page *vmalloc_to_page(const void *addr); |
369 | unsigned long vmalloc_to_pfn(const void *addr); | |
48667e7a | 370 | |
0738c4bb PM |
371 | /* |
372 | * Determine if an address is within the vmalloc range | |
373 | * | |
374 | * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there | |
375 | * is no special casing required. | |
376 | */ | |
9e2779fa CL |
377 | static inline int is_vmalloc_addr(const void *x) |
378 | { | |
0738c4bb | 379 | #ifdef CONFIG_MMU |
9e2779fa CL |
380 | unsigned long addr = (unsigned long)x; |
381 | ||
382 | return addr >= VMALLOC_START && addr < VMALLOC_END; | |
0738c4bb PM |
383 | #else |
384 | return 0; | |
8ca3ed87 | 385 | #endif |
0738c4bb | 386 | } |
81ac3ad9 KH |
387 | #ifdef CONFIG_MMU |
388 | extern int is_vmalloc_or_module_addr(const void *x); | |
389 | #else | |
934831d0 | 390 | static inline int is_vmalloc_or_module_addr(const void *x) |
81ac3ad9 KH |
391 | { |
392 | return 0; | |
393 | } | |
394 | #endif | |
9e2779fa | 395 | |
39f1f78d AV |
396 | extern void kvfree(const void *addr); |
397 | ||
e9da73d6 AA |
398 | static inline void compound_lock(struct page *page) |
399 | { | |
400 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
309381fe | 401 | VM_BUG_ON_PAGE(PageSlab(page), page); |
e9da73d6 AA |
402 | bit_spin_lock(PG_compound_lock, &page->flags); |
403 | #endif | |
404 | } | |
405 | ||
406 | static inline void compound_unlock(struct page *page) | |
407 | { | |
408 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
309381fe | 409 | VM_BUG_ON_PAGE(PageSlab(page), page); |
e9da73d6 AA |
410 | bit_spin_unlock(PG_compound_lock, &page->flags); |
411 | #endif | |
412 | } | |
413 | ||
414 | static inline unsigned long compound_lock_irqsave(struct page *page) | |
415 | { | |
416 | unsigned long uninitialized_var(flags); | |
417 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
418 | local_irq_save(flags); | |
419 | compound_lock(page); | |
420 | #endif | |
421 | return flags; | |
422 | } | |
423 | ||
424 | static inline void compound_unlock_irqrestore(struct page *page, | |
425 | unsigned long flags) | |
426 | { | |
427 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
428 | compound_unlock(page); | |
429 | local_irq_restore(flags); | |
430 | #endif | |
431 | } | |
432 | ||
d2ee40ea JZ |
433 | static inline struct page *compound_head_by_tail(struct page *tail) |
434 | { | |
435 | struct page *head = tail->first_page; | |
436 | ||
437 | /* | |
438 | * page->first_page may be a dangling pointer to an old | |
439 | * compound page, so recheck that it is still a tail | |
440 | * page before returning. | |
441 | */ | |
442 | smp_rmb(); | |
443 | if (likely(PageTail(tail))) | |
444 | return head; | |
445 | return tail; | |
446 | } | |
447 | ||
ccaafd7f JK |
448 | /* |
449 | * Since either compound page could be dismantled asynchronously in THP | |
450 | * or we access asynchronously arbitrary positioned struct page, there | |
451 | * would be tail flag race. To handle this race, we should call | |
452 | * smp_rmb() before checking tail flag. compound_head_by_tail() did it. | |
453 | */ | |
d85f3385 CL |
454 | static inline struct page *compound_head(struct page *page) |
455 | { | |
d2ee40ea JZ |
456 | if (unlikely(PageTail(page))) |
457 | return compound_head_by_tail(page); | |
d85f3385 CL |
458 | return page; |
459 | } | |
460 | ||
ccaafd7f JK |
461 | /* |
462 | * If we access compound page synchronously such as access to | |
463 | * allocated page, there is no need to handle tail flag race, so we can | |
464 | * check tail flag directly without any synchronization primitive. | |
465 | */ | |
466 | static inline struct page *compound_head_fast(struct page *page) | |
467 | { | |
468 | if (unlikely(PageTail(page))) | |
469 | return page->first_page; | |
470 | return page; | |
471 | } | |
472 | ||
70b50f94 AA |
473 | /* |
474 | * The atomic page->_mapcount, starts from -1: so that transitions | |
475 | * both from it and to it can be tracked, using atomic_inc_and_test | |
476 | * and atomic_add_negative(-1). | |
477 | */ | |
22b751c3 | 478 | static inline void page_mapcount_reset(struct page *page) |
70b50f94 AA |
479 | { |
480 | atomic_set(&(page)->_mapcount, -1); | |
481 | } | |
482 | ||
483 | static inline int page_mapcount(struct page *page) | |
484 | { | |
1d148e21 WY |
485 | VM_BUG_ON_PAGE(PageSlab(page), page); |
486 | return atomic_read(&page->_mapcount) + 1; | |
70b50f94 AA |
487 | } |
488 | ||
4c21e2f2 | 489 | static inline int page_count(struct page *page) |
1da177e4 | 490 | { |
d85f3385 | 491 | return atomic_read(&compound_head(page)->_count); |
1da177e4 LT |
492 | } |
493 | ||
44518d2b AA |
494 | static inline bool __compound_tail_refcounted(struct page *page) |
495 | { | |
c761471b | 496 | return PageAnon(page) && !PageSlab(page) && !PageHeadHuge(page); |
44518d2b AA |
497 | } |
498 | ||
499 | /* | |
500 | * This takes a head page as parameter and tells if the | |
501 | * tail page reference counting can be skipped. | |
502 | * | |
503 | * For this to be safe, PageSlab and PageHeadHuge must remain true on | |
504 | * any given page where they return true here, until all tail pins | |
505 | * have been released. | |
506 | */ | |
507 | static inline bool compound_tail_refcounted(struct page *page) | |
508 | { | |
309381fe | 509 | VM_BUG_ON_PAGE(!PageHead(page), page); |
44518d2b AA |
510 | return __compound_tail_refcounted(page); |
511 | } | |
512 | ||
b35a35b5 AA |
513 | static inline void get_huge_page_tail(struct page *page) |
514 | { | |
515 | /* | |
5eaf1a9e | 516 | * __split_huge_page_refcount() cannot run from under us. |
b35a35b5 | 517 | */ |
309381fe SL |
518 | VM_BUG_ON_PAGE(!PageTail(page), page); |
519 | VM_BUG_ON_PAGE(page_mapcount(page) < 0, page); | |
520 | VM_BUG_ON_PAGE(atomic_read(&page->_count) != 0, page); | |
5eaf1a9e | 521 | if (compound_tail_refcounted(page->first_page)) |
44518d2b | 522 | atomic_inc(&page->_mapcount); |
b35a35b5 AA |
523 | } |
524 | ||
70b50f94 AA |
525 | extern bool __get_page_tail(struct page *page); |
526 | ||
1da177e4 LT |
527 | static inline void get_page(struct page *page) |
528 | { | |
70b50f94 AA |
529 | if (unlikely(PageTail(page))) |
530 | if (likely(__get_page_tail(page))) | |
531 | return; | |
91807063 AA |
532 | /* |
533 | * Getting a normal page or the head of a compound page | |
70b50f94 | 534 | * requires to already have an elevated page->_count. |
91807063 | 535 | */ |
309381fe | 536 | VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page); |
1da177e4 LT |
537 | atomic_inc(&page->_count); |
538 | } | |
539 | ||
b49af68f CL |
540 | static inline struct page *virt_to_head_page(const void *x) |
541 | { | |
542 | struct page *page = virt_to_page(x); | |
ccaafd7f JK |
543 | |
544 | /* | |
545 | * We don't need to worry about synchronization of tail flag | |
546 | * when we call virt_to_head_page() since it is only called for | |
547 | * already allocated page and this page won't be freed until | |
548 | * this virt_to_head_page() is finished. So use _fast variant. | |
549 | */ | |
550 | return compound_head_fast(page); | |
b49af68f CL |
551 | } |
552 | ||
7835e98b NP |
553 | /* |
554 | * Setup the page count before being freed into the page allocator for | |
555 | * the first time (boot or memory hotplug) | |
556 | */ | |
557 | static inline void init_page_count(struct page *page) | |
558 | { | |
559 | atomic_set(&page->_count, 1); | |
560 | } | |
561 | ||
1da177e4 | 562 | void put_page(struct page *page); |
1d7ea732 | 563 | void put_pages_list(struct list_head *pages); |
1da177e4 | 564 | |
8dfcc9ba | 565 | void split_page(struct page *page, unsigned int order); |
748446bb | 566 | int split_free_page(struct page *page); |
8dfcc9ba | 567 | |
33f2ef89 AW |
568 | /* |
569 | * Compound pages have a destructor function. Provide a | |
570 | * prototype for that function and accessor functions. | |
f1e61557 | 571 | * These are _only_ valid on the head of a compound page. |
33f2ef89 | 572 | */ |
f1e61557 KS |
573 | typedef void compound_page_dtor(struct page *); |
574 | ||
575 | /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */ | |
576 | enum compound_dtor_id { | |
577 | NULL_COMPOUND_DTOR, | |
578 | COMPOUND_PAGE_DTOR, | |
579 | #ifdef CONFIG_HUGETLB_PAGE | |
580 | HUGETLB_PAGE_DTOR, | |
581 | #endif | |
582 | NR_COMPOUND_DTORS, | |
583 | }; | |
584 | extern compound_page_dtor * const compound_page_dtors[]; | |
33f2ef89 AW |
585 | |
586 | static inline void set_compound_page_dtor(struct page *page, | |
f1e61557 | 587 | enum compound_dtor_id compound_dtor) |
33f2ef89 | 588 | { |
f1e61557 KS |
589 | VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page); |
590 | page[1].compound_dtor = compound_dtor; | |
33f2ef89 AW |
591 | } |
592 | ||
593 | static inline compound_page_dtor *get_compound_page_dtor(struct page *page) | |
594 | { | |
f1e61557 KS |
595 | VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page); |
596 | return compound_page_dtors[page[1].compound_dtor]; | |
33f2ef89 AW |
597 | } |
598 | ||
d85f3385 CL |
599 | static inline int compound_order(struct page *page) |
600 | { | |
6d777953 | 601 | if (!PageHead(page)) |
d85f3385 | 602 | return 0; |
e4b294c2 | 603 | return page[1].compound_order; |
d85f3385 CL |
604 | } |
605 | ||
f1e61557 | 606 | static inline void set_compound_order(struct page *page, unsigned int order) |
d85f3385 | 607 | { |
e4b294c2 | 608 | page[1].compound_order = order; |
d85f3385 CL |
609 | } |
610 | ||
3dece370 | 611 | #ifdef CONFIG_MMU |
14fd403f AA |
612 | /* |
613 | * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when | |
614 | * servicing faults for write access. In the normal case, do always want | |
615 | * pte_mkwrite. But get_user_pages can cause write faults for mappings | |
616 | * that do not have writing enabled, when used by access_process_vm. | |
617 | */ | |
618 | static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) | |
619 | { | |
620 | if (likely(vma->vm_flags & VM_WRITE)) | |
621 | pte = pte_mkwrite(pte); | |
622 | return pte; | |
623 | } | |
8c6e50b0 KS |
624 | |
625 | void do_set_pte(struct vm_area_struct *vma, unsigned long address, | |
626 | struct page *page, pte_t *pte, bool write, bool anon); | |
3dece370 | 627 | #endif |
14fd403f | 628 | |
1da177e4 LT |
629 | /* |
630 | * Multiple processes may "see" the same page. E.g. for untouched | |
631 | * mappings of /dev/null, all processes see the same page full of | |
632 | * zeroes, and text pages of executables and shared libraries have | |
633 | * only one copy in memory, at most, normally. | |
634 | * | |
635 | * For the non-reserved pages, page_count(page) denotes a reference count. | |
7e871b6c PBG |
636 | * page_count() == 0 means the page is free. page->lru is then used for |
637 | * freelist management in the buddy allocator. | |
da6052f7 | 638 | * page_count() > 0 means the page has been allocated. |
1da177e4 | 639 | * |
da6052f7 NP |
640 | * Pages are allocated by the slab allocator in order to provide memory |
641 | * to kmalloc and kmem_cache_alloc. In this case, the management of the | |
642 | * page, and the fields in 'struct page' are the responsibility of mm/slab.c | |
643 | * unless a particular usage is carefully commented. (the responsibility of | |
644 | * freeing the kmalloc memory is the caller's, of course). | |
1da177e4 | 645 | * |
da6052f7 NP |
646 | * A page may be used by anyone else who does a __get_free_page(). |
647 | * In this case, page_count still tracks the references, and should only | |
648 | * be used through the normal accessor functions. The top bits of page->flags | |
649 | * and page->virtual store page management information, but all other fields | |
650 | * are unused and could be used privately, carefully. The management of this | |
651 | * page is the responsibility of the one who allocated it, and those who have | |
652 | * subsequently been given references to it. | |
653 | * | |
654 | * The other pages (we may call them "pagecache pages") are completely | |
1da177e4 LT |
655 | * managed by the Linux memory manager: I/O, buffers, swapping etc. |
656 | * The following discussion applies only to them. | |
657 | * | |
da6052f7 NP |
658 | * A pagecache page contains an opaque `private' member, which belongs to the |
659 | * page's address_space. Usually, this is the address of a circular list of | |
660 | * the page's disk buffers. PG_private must be set to tell the VM to call | |
661 | * into the filesystem to release these pages. | |
1da177e4 | 662 | * |
da6052f7 NP |
663 | * A page may belong to an inode's memory mapping. In this case, page->mapping |
664 | * is the pointer to the inode, and page->index is the file offset of the page, | |
665 | * in units of PAGE_CACHE_SIZE. | |
1da177e4 | 666 | * |
da6052f7 NP |
667 | * If pagecache pages are not associated with an inode, they are said to be |
668 | * anonymous pages. These may become associated with the swapcache, and in that | |
669 | * case PG_swapcache is set, and page->private is an offset into the swapcache. | |
1da177e4 | 670 | * |
da6052f7 NP |
671 | * In either case (swapcache or inode backed), the pagecache itself holds one |
672 | * reference to the page. Setting PG_private should also increment the | |
673 | * refcount. The each user mapping also has a reference to the page. | |
1da177e4 | 674 | * |
da6052f7 NP |
675 | * The pagecache pages are stored in a per-mapping radix tree, which is |
676 | * rooted at mapping->page_tree, and indexed by offset. | |
677 | * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space | |
678 | * lists, we instead now tag pages as dirty/writeback in the radix tree. | |
1da177e4 | 679 | * |
da6052f7 | 680 | * All pagecache pages may be subject to I/O: |
1da177e4 LT |
681 | * - inode pages may need to be read from disk, |
682 | * - inode pages which have been modified and are MAP_SHARED may need | |
da6052f7 NP |
683 | * to be written back to the inode on disk, |
684 | * - anonymous pages (including MAP_PRIVATE file mappings) which have been | |
685 | * modified may need to be swapped out to swap space and (later) to be read | |
686 | * back into memory. | |
1da177e4 LT |
687 | */ |
688 | ||
689 | /* | |
690 | * The zone field is never updated after free_area_init_core() | |
691 | * sets it, so none of the operations on it need to be atomic. | |
1da177e4 | 692 | */ |
348f8b6c | 693 | |
90572890 | 694 | /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */ |
07808b74 | 695 | #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
d41dee36 AW |
696 | #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
697 | #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) | |
90572890 | 698 | #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH) |
d41dee36 | 699 | |
348f8b6c | 700 | /* |
25985edc | 701 | * Define the bit shifts to access each section. For non-existent |
348f8b6c DH |
702 | * sections we define the shift as 0; that plus a 0 mask ensures |
703 | * the compiler will optimise away reference to them. | |
704 | */ | |
d41dee36 AW |
705 | #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
706 | #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) | |
707 | #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) | |
90572890 | 708 | #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0)) |
348f8b6c | 709 | |
bce54bbf WD |
710 | /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ |
711 | #ifdef NODE_NOT_IN_PAGE_FLAGS | |
89689ae7 | 712 | #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
713 | #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
714 | SECTIONS_PGOFF : ZONES_PGOFF) | |
d41dee36 | 715 | #else |
89689ae7 | 716 | #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
bd8029b6 AW |
717 | #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
718 | NODES_PGOFF : ZONES_PGOFF) | |
89689ae7 CL |
719 | #endif |
720 | ||
bd8029b6 | 721 | #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
348f8b6c | 722 | |
9223b419 CL |
723 | #if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS |
724 | #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS | |
348f8b6c DH |
725 | #endif |
726 | ||
d41dee36 AW |
727 | #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
728 | #define NODES_MASK ((1UL << NODES_WIDTH) - 1) | |
729 | #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) | |
834a964a | 730 | #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1) |
89689ae7 | 731 | #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
348f8b6c | 732 | |
33dd4e0e | 733 | static inline enum zone_type page_zonenum(const struct page *page) |
1da177e4 | 734 | { |
348f8b6c | 735 | return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
1da177e4 | 736 | } |
1da177e4 | 737 | |
9127ab4f CS |
738 | #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
739 | #define SECTION_IN_PAGE_FLAGS | |
740 | #endif | |
741 | ||
89689ae7 | 742 | /* |
7a8010cd VB |
743 | * The identification function is mainly used by the buddy allocator for |
744 | * determining if two pages could be buddies. We are not really identifying | |
745 | * the zone since we could be using the section number id if we do not have | |
746 | * node id available in page flags. | |
747 | * We only guarantee that it will return the same value for two combinable | |
748 | * pages in a zone. | |
89689ae7 | 749 | */ |
cb2b95e1 AW |
750 | static inline int page_zone_id(struct page *page) |
751 | { | |
89689ae7 | 752 | return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
348f8b6c DH |
753 | } |
754 | ||
25ba77c1 | 755 | static inline int zone_to_nid(struct zone *zone) |
89fa3024 | 756 | { |
d5f541ed CL |
757 | #ifdef CONFIG_NUMA |
758 | return zone->node; | |
759 | #else | |
760 | return 0; | |
761 | #endif | |
89fa3024 CL |
762 | } |
763 | ||
89689ae7 | 764 | #ifdef NODE_NOT_IN_PAGE_FLAGS |
33dd4e0e | 765 | extern int page_to_nid(const struct page *page); |
89689ae7 | 766 | #else |
33dd4e0e | 767 | static inline int page_to_nid(const struct page *page) |
d41dee36 | 768 | { |
89689ae7 | 769 | return (page->flags >> NODES_PGSHIFT) & NODES_MASK; |
d41dee36 | 770 | } |
89689ae7 CL |
771 | #endif |
772 | ||
57e0a030 | 773 | #ifdef CONFIG_NUMA_BALANCING |
90572890 | 774 | static inline int cpu_pid_to_cpupid(int cpu, int pid) |
57e0a030 | 775 | { |
90572890 | 776 | return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK); |
57e0a030 MG |
777 | } |
778 | ||
90572890 | 779 | static inline int cpupid_to_pid(int cpupid) |
57e0a030 | 780 | { |
90572890 | 781 | return cpupid & LAST__PID_MASK; |
57e0a030 | 782 | } |
b795854b | 783 | |
90572890 | 784 | static inline int cpupid_to_cpu(int cpupid) |
b795854b | 785 | { |
90572890 | 786 | return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK; |
b795854b MG |
787 | } |
788 | ||
90572890 | 789 | static inline int cpupid_to_nid(int cpupid) |
b795854b | 790 | { |
90572890 | 791 | return cpu_to_node(cpupid_to_cpu(cpupid)); |
b795854b MG |
792 | } |
793 | ||
90572890 | 794 | static inline bool cpupid_pid_unset(int cpupid) |
57e0a030 | 795 | { |
90572890 | 796 | return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK); |
b795854b MG |
797 | } |
798 | ||
90572890 | 799 | static inline bool cpupid_cpu_unset(int cpupid) |
b795854b | 800 | { |
90572890 | 801 | return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK); |
b795854b MG |
802 | } |
803 | ||
8c8a743c PZ |
804 | static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid) |
805 | { | |
806 | return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid); | |
807 | } | |
808 | ||
809 | #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid) | |
90572890 PZ |
810 | #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
811 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
b795854b | 812 | { |
1ae71d03 | 813 | return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK); |
b795854b | 814 | } |
90572890 PZ |
815 | |
816 | static inline int page_cpupid_last(struct page *page) | |
817 | { | |
818 | return page->_last_cpupid; | |
819 | } | |
820 | static inline void page_cpupid_reset_last(struct page *page) | |
b795854b | 821 | { |
1ae71d03 | 822 | page->_last_cpupid = -1 & LAST_CPUPID_MASK; |
57e0a030 MG |
823 | } |
824 | #else | |
90572890 | 825 | static inline int page_cpupid_last(struct page *page) |
75980e97 | 826 | { |
90572890 | 827 | return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK; |
75980e97 PZ |
828 | } |
829 | ||
90572890 | 830 | extern int page_cpupid_xchg_last(struct page *page, int cpupid); |
75980e97 | 831 | |
90572890 | 832 | static inline void page_cpupid_reset_last(struct page *page) |
75980e97 | 833 | { |
90572890 | 834 | int cpupid = (1 << LAST_CPUPID_SHIFT) - 1; |
4468b8f1 | 835 | |
90572890 PZ |
836 | page->flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT); |
837 | page->flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT; | |
75980e97 | 838 | } |
90572890 PZ |
839 | #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */ |
840 | #else /* !CONFIG_NUMA_BALANCING */ | |
841 | static inline int page_cpupid_xchg_last(struct page *page, int cpupid) | |
57e0a030 | 842 | { |
90572890 | 843 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
844 | } |
845 | ||
90572890 | 846 | static inline int page_cpupid_last(struct page *page) |
57e0a030 | 847 | { |
90572890 | 848 | return page_to_nid(page); /* XXX */ |
57e0a030 MG |
849 | } |
850 | ||
90572890 | 851 | static inline int cpupid_to_nid(int cpupid) |
b795854b MG |
852 | { |
853 | return -1; | |
854 | } | |
855 | ||
90572890 | 856 | static inline int cpupid_to_pid(int cpupid) |
b795854b MG |
857 | { |
858 | return -1; | |
859 | } | |
860 | ||
90572890 | 861 | static inline int cpupid_to_cpu(int cpupid) |
b795854b MG |
862 | { |
863 | return -1; | |
864 | } | |
865 | ||
90572890 PZ |
866 | static inline int cpu_pid_to_cpupid(int nid, int pid) |
867 | { | |
868 | return -1; | |
869 | } | |
870 | ||
871 | static inline bool cpupid_pid_unset(int cpupid) | |
b795854b MG |
872 | { |
873 | return 1; | |
874 | } | |
875 | ||
90572890 | 876 | static inline void page_cpupid_reset_last(struct page *page) |
57e0a030 MG |
877 | { |
878 | } | |
8c8a743c PZ |
879 | |
880 | static inline bool cpupid_match_pid(struct task_struct *task, int cpupid) | |
881 | { | |
882 | return false; | |
883 | } | |
90572890 | 884 | #endif /* CONFIG_NUMA_BALANCING */ |
57e0a030 | 885 | |
33dd4e0e | 886 | static inline struct zone *page_zone(const struct page *page) |
89689ae7 CL |
887 | { |
888 | return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; | |
889 | } | |
890 | ||
9127ab4f | 891 | #ifdef SECTION_IN_PAGE_FLAGS |
bf4e8902 DK |
892 | static inline void set_page_section(struct page *page, unsigned long section) |
893 | { | |
894 | page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); | |
895 | page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; | |
896 | } | |
897 | ||
aa462abe | 898 | static inline unsigned long page_to_section(const struct page *page) |
d41dee36 AW |
899 | { |
900 | return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; | |
901 | } | |
308c05e3 | 902 | #endif |
d41dee36 | 903 | |
2f1b6248 | 904 | static inline void set_page_zone(struct page *page, enum zone_type zone) |
348f8b6c DH |
905 | { |
906 | page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); | |
907 | page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; | |
908 | } | |
2f1b6248 | 909 | |
348f8b6c DH |
910 | static inline void set_page_node(struct page *page, unsigned long node) |
911 | { | |
912 | page->flags &= ~(NODES_MASK << NODES_PGSHIFT); | |
913 | page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; | |
1da177e4 | 914 | } |
89689ae7 | 915 | |
2f1b6248 | 916 | static inline void set_page_links(struct page *page, enum zone_type zone, |
d41dee36 | 917 | unsigned long node, unsigned long pfn) |
1da177e4 | 918 | { |
348f8b6c DH |
919 | set_page_zone(page, zone); |
920 | set_page_node(page, node); | |
9127ab4f | 921 | #ifdef SECTION_IN_PAGE_FLAGS |
d41dee36 | 922 | set_page_section(page, pfn_to_section_nr(pfn)); |
bf4e8902 | 923 | #endif |
1da177e4 LT |
924 | } |
925 | ||
0610c25d GT |
926 | #ifdef CONFIG_MEMCG |
927 | static inline struct mem_cgroup *page_memcg(struct page *page) | |
928 | { | |
929 | return page->mem_cgroup; | |
930 | } | |
931 | ||
932 | static inline void set_page_memcg(struct page *page, struct mem_cgroup *memcg) | |
933 | { | |
934 | page->mem_cgroup = memcg; | |
935 | } | |
936 | #else | |
937 | static inline struct mem_cgroup *page_memcg(struct page *page) | |
938 | { | |
939 | return NULL; | |
940 | } | |
941 | ||
942 | static inline void set_page_memcg(struct page *page, struct mem_cgroup *memcg) | |
943 | { | |
944 | } | |
945 | #endif | |
946 | ||
f6ac2354 CL |
947 | /* |
948 | * Some inline functions in vmstat.h depend on page_zone() | |
949 | */ | |
950 | #include <linux/vmstat.h> | |
951 | ||
33dd4e0e | 952 | static __always_inline void *lowmem_page_address(const struct page *page) |
1da177e4 | 953 | { |
aa462abe | 954 | return __va(PFN_PHYS(page_to_pfn(page))); |
1da177e4 LT |
955 | } |
956 | ||
957 | #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) | |
958 | #define HASHED_PAGE_VIRTUAL | |
959 | #endif | |
960 | ||
961 | #if defined(WANT_PAGE_VIRTUAL) | |
f92f455f GU |
962 | static inline void *page_address(const struct page *page) |
963 | { | |
964 | return page->virtual; | |
965 | } | |
966 | static inline void set_page_address(struct page *page, void *address) | |
967 | { | |
968 | page->virtual = address; | |
969 | } | |
1da177e4 LT |
970 | #define page_address_init() do { } while(0) |
971 | #endif | |
972 | ||
973 | #if defined(HASHED_PAGE_VIRTUAL) | |
f9918794 | 974 | void *page_address(const struct page *page); |
1da177e4 LT |
975 | void set_page_address(struct page *page, void *virtual); |
976 | void page_address_init(void); | |
977 | #endif | |
978 | ||
979 | #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) | |
980 | #define page_address(page) lowmem_page_address(page) | |
981 | #define set_page_address(page, address) do { } while(0) | |
982 | #define page_address_init() do { } while(0) | |
983 | #endif | |
984 | ||
e39155ea KS |
985 | extern void *page_rmapping(struct page *page); |
986 | extern struct anon_vma *page_anon_vma(struct page *page); | |
9800339b | 987 | extern struct address_space *page_mapping(struct page *page); |
1da177e4 | 988 | |
f981c595 MG |
989 | extern struct address_space *__page_file_mapping(struct page *); |
990 | ||
991 | static inline | |
992 | struct address_space *page_file_mapping(struct page *page) | |
993 | { | |
994 | if (unlikely(PageSwapCache(page))) | |
995 | return __page_file_mapping(page); | |
996 | ||
997 | return page->mapping; | |
998 | } | |
999 | ||
1da177e4 LT |
1000 | /* |
1001 | * Return the pagecache index of the passed page. Regular pagecache pages | |
1002 | * use ->index whereas swapcache pages use ->private | |
1003 | */ | |
1004 | static inline pgoff_t page_index(struct page *page) | |
1005 | { | |
1006 | if (unlikely(PageSwapCache(page))) | |
4c21e2f2 | 1007 | return page_private(page); |
1da177e4 LT |
1008 | return page->index; |
1009 | } | |
1010 | ||
f981c595 MG |
1011 | extern pgoff_t __page_file_index(struct page *page); |
1012 | ||
1013 | /* | |
1014 | * Return the file index of the page. Regular pagecache pages use ->index | |
1015 | * whereas swapcache pages use swp_offset(->private) | |
1016 | */ | |
1017 | static inline pgoff_t page_file_index(struct page *page) | |
1018 | { | |
1019 | if (unlikely(PageSwapCache(page))) | |
1020 | return __page_file_index(page); | |
1021 | ||
1022 | return page->index; | |
1023 | } | |
1024 | ||
1da177e4 LT |
1025 | /* |
1026 | * Return true if this page is mapped into pagetables. | |
1027 | */ | |
1028 | static inline int page_mapped(struct page *page) | |
1029 | { | |
1030 | return atomic_read(&(page)->_mapcount) >= 0; | |
1031 | } | |
1032 | ||
2f064f34 MH |
1033 | /* |
1034 | * Return true only if the page has been allocated with | |
1035 | * ALLOC_NO_WATERMARKS and the low watermark was not | |
1036 | * met implying that the system is under some pressure. | |
1037 | */ | |
1038 | static inline bool page_is_pfmemalloc(struct page *page) | |
1039 | { | |
1040 | /* | |
1041 | * Page index cannot be this large so this must be | |
1042 | * a pfmemalloc page. | |
1043 | */ | |
1044 | return page->index == -1UL; | |
1045 | } | |
1046 | ||
1047 | /* | |
1048 | * Only to be called by the page allocator on a freshly allocated | |
1049 | * page. | |
1050 | */ | |
1051 | static inline void set_page_pfmemalloc(struct page *page) | |
1052 | { | |
1053 | page->index = -1UL; | |
1054 | } | |
1055 | ||
1056 | static inline void clear_page_pfmemalloc(struct page *page) | |
1057 | { | |
1058 | page->index = 0; | |
1059 | } | |
1060 | ||
1da177e4 LT |
1061 | /* |
1062 | * Different kinds of faults, as returned by handle_mm_fault(). | |
1063 | * Used to decide whether a process gets delivered SIGBUS or | |
1064 | * just gets major/minor fault counters bumped up. | |
1065 | */ | |
d0217ac0 | 1066 | |
83c54070 | 1067 | #define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */ |
d0217ac0 | 1068 | |
83c54070 NP |
1069 | #define VM_FAULT_OOM 0x0001 |
1070 | #define VM_FAULT_SIGBUS 0x0002 | |
1071 | #define VM_FAULT_MAJOR 0x0004 | |
1072 | #define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ | |
aa50d3a7 AK |
1073 | #define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */ |
1074 | #define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */ | |
33692f27 | 1075 | #define VM_FAULT_SIGSEGV 0x0040 |
f33ea7f4 | 1076 | |
83c54070 NP |
1077 | #define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ |
1078 | #define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ | |
d065bd81 | 1079 | #define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */ |
c0292554 | 1080 | #define VM_FAULT_FALLBACK 0x0800 /* huge page fault failed, fall back to small */ |
1da177e4 | 1081 | |
aa50d3a7 AK |
1082 | #define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */ |
1083 | ||
33692f27 LT |
1084 | #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV | \ |
1085 | VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \ | |
1086 | VM_FAULT_FALLBACK) | |
aa50d3a7 AK |
1087 | |
1088 | /* Encode hstate index for a hwpoisoned large page */ | |
1089 | #define VM_FAULT_SET_HINDEX(x) ((x) << 12) | |
1090 | #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf) | |
d0217ac0 | 1091 | |
1c0fe6e3 NP |
1092 | /* |
1093 | * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. | |
1094 | */ | |
1095 | extern void pagefault_out_of_memory(void); | |
1096 | ||
1da177e4 LT |
1097 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
1098 | ||
ddd588b5 | 1099 | /* |
7bf02ea2 | 1100 | * Flags passed to show_mem() and show_free_areas() to suppress output in |
ddd588b5 DR |
1101 | * various contexts. |
1102 | */ | |
4b59e6c4 | 1103 | #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */ |
ddd588b5 | 1104 | |
7bf02ea2 DR |
1105 | extern void show_free_areas(unsigned int flags); |
1106 | extern bool skip_free_areas_node(unsigned int flags, int nid); | |
1da177e4 | 1107 | |
1da177e4 | 1108 | int shmem_zero_setup(struct vm_area_struct *); |
0cd6144a JW |
1109 | #ifdef CONFIG_SHMEM |
1110 | bool shmem_mapping(struct address_space *mapping); | |
1111 | #else | |
1112 | static inline bool shmem_mapping(struct address_space *mapping) | |
1113 | { | |
1114 | return false; | |
1115 | } | |
1116 | #endif | |
1da177e4 | 1117 | |
e8edc6e0 | 1118 | extern int can_do_mlock(void); |
1da177e4 LT |
1119 | extern int user_shm_lock(size_t, struct user_struct *); |
1120 | extern void user_shm_unlock(size_t, struct user_struct *); | |
1121 | ||
1122 | /* | |
1123 | * Parameter block passed down to zap_pte_range in exceptional cases. | |
1124 | */ | |
1125 | struct zap_details { | |
1da177e4 LT |
1126 | struct address_space *check_mapping; /* Check page->mapping if set */ |
1127 | pgoff_t first_index; /* Lowest page->index to unmap */ | |
1128 | pgoff_t last_index; /* Highest page->index to unmap */ | |
1da177e4 LT |
1129 | }; |
1130 | ||
7e675137 NP |
1131 | struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
1132 | pte_t pte); | |
1133 | ||
c627f9cc JS |
1134 | int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
1135 | unsigned long size); | |
14f5ff5d | 1136 | void zap_page_range(struct vm_area_struct *vma, unsigned long address, |
1da177e4 | 1137 | unsigned long size, struct zap_details *); |
4f74d2c8 LT |
1138 | void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
1139 | unsigned long start, unsigned long end); | |
e6473092 MM |
1140 | |
1141 | /** | |
1142 | * mm_walk - callbacks for walk_page_range | |
e6473092 | 1143 | * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry |
03319327 DH |
1144 | * this handler is required to be able to handle |
1145 | * pmd_trans_huge() pmds. They may simply choose to | |
1146 | * split_huge_page() instead of handling it explicitly. | |
e6473092 MM |
1147 | * @pte_entry: if set, called for each non-empty PTE (4th-level) entry |
1148 | * @pte_hole: if set, called for each hole at all levels | |
5dc37642 | 1149 | * @hugetlb_entry: if set, called for each hugetlb entry |
fafaa426 NH |
1150 | * @test_walk: caller specific callback function to determine whether |
1151 | * we walk over the current vma or not. A positive returned | |
1152 | * value means "do page table walk over the current vma," | |
1153 | * and a negative one means "abort current page table walk | |
1154 | * right now." 0 means "skip the current vma." | |
1155 | * @mm: mm_struct representing the target process of page table walk | |
1156 | * @vma: vma currently walked (NULL if walking outside vmas) | |
1157 | * @private: private data for callbacks' usage | |
e6473092 | 1158 | * |
fafaa426 | 1159 | * (see the comment on walk_page_range() for more details) |
e6473092 MM |
1160 | */ |
1161 | struct mm_walk { | |
0f157a5b AM |
1162 | int (*pmd_entry)(pmd_t *pmd, unsigned long addr, |
1163 | unsigned long next, struct mm_walk *walk); | |
1164 | int (*pte_entry)(pte_t *pte, unsigned long addr, | |
1165 | unsigned long next, struct mm_walk *walk); | |
1166 | int (*pte_hole)(unsigned long addr, unsigned long next, | |
1167 | struct mm_walk *walk); | |
1168 | int (*hugetlb_entry)(pte_t *pte, unsigned long hmask, | |
1169 | unsigned long addr, unsigned long next, | |
1170 | struct mm_walk *walk); | |
fafaa426 NH |
1171 | int (*test_walk)(unsigned long addr, unsigned long next, |
1172 | struct mm_walk *walk); | |
2165009b | 1173 | struct mm_struct *mm; |
fafaa426 | 1174 | struct vm_area_struct *vma; |
2165009b | 1175 | void *private; |
e6473092 MM |
1176 | }; |
1177 | ||
2165009b DH |
1178 | int walk_page_range(unsigned long addr, unsigned long end, |
1179 | struct mm_walk *walk); | |
900fc5f1 | 1180 | int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk); |
42b77728 | 1181 | void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
3bf5ee95 | 1182 | unsigned long end, unsigned long floor, unsigned long ceiling); |
1da177e4 LT |
1183 | int copy_page_range(struct mm_struct *dst, struct mm_struct *src, |
1184 | struct vm_area_struct *vma); | |
1da177e4 LT |
1185 | void unmap_mapping_range(struct address_space *mapping, |
1186 | loff_t const holebegin, loff_t const holelen, int even_cows); | |
3b6748e2 JW |
1187 | int follow_pfn(struct vm_area_struct *vma, unsigned long address, |
1188 | unsigned long *pfn); | |
d87fe660 | 1189 | int follow_phys(struct vm_area_struct *vma, unsigned long address, |
1190 | unsigned int flags, unsigned long *prot, resource_size_t *phys); | |
28b2ee20 RR |
1191 | int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
1192 | void *buf, int len, int write); | |
1da177e4 LT |
1193 | |
1194 | static inline void unmap_shared_mapping_range(struct address_space *mapping, | |
1195 | loff_t const holebegin, loff_t const holelen) | |
1196 | { | |
1197 | unmap_mapping_range(mapping, holebegin, holelen, 0); | |
1198 | } | |
1199 | ||
7caef267 | 1200 | extern void truncate_pagecache(struct inode *inode, loff_t new); |
2c27c65e | 1201 | extern void truncate_setsize(struct inode *inode, loff_t newsize); |
90a80202 | 1202 | void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to); |
623e3db9 | 1203 | void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end); |
750b4987 | 1204 | int truncate_inode_page(struct address_space *mapping, struct page *page); |
25718736 | 1205 | int generic_error_remove_page(struct address_space *mapping, struct page *page); |
83f78668 WF |
1206 | int invalidate_inode_page(struct page *page); |
1207 | ||
7ee1dd3f | 1208 | #ifdef CONFIG_MMU |
83c54070 | 1209 | extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
d06063cc | 1210 | unsigned long address, unsigned int flags); |
5c723ba5 PZ |
1211 | extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, |
1212 | unsigned long address, unsigned int fault_flags); | |
7ee1dd3f DH |
1213 | #else |
1214 | static inline int handle_mm_fault(struct mm_struct *mm, | |
1215 | struct vm_area_struct *vma, unsigned long address, | |
d06063cc | 1216 | unsigned int flags) |
7ee1dd3f DH |
1217 | { |
1218 | /* should never happen if there's no MMU */ | |
1219 | BUG(); | |
1220 | return VM_FAULT_SIGBUS; | |
1221 | } | |
5c723ba5 PZ |
1222 | static inline int fixup_user_fault(struct task_struct *tsk, |
1223 | struct mm_struct *mm, unsigned long address, | |
1224 | unsigned int fault_flags) | |
1225 | { | |
1226 | /* should never happen if there's no MMU */ | |
1227 | BUG(); | |
1228 | return -EFAULT; | |
1229 | } | |
7ee1dd3f | 1230 | #endif |
f33ea7f4 | 1231 | |
1da177e4 | 1232 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); |
5ddd36b9 SW |
1233 | extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
1234 | void *buf, int len, int write); | |
1da177e4 | 1235 | |
28a35716 ML |
1236 | long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, |
1237 | unsigned long start, unsigned long nr_pages, | |
1238 | unsigned int foll_flags, struct page **pages, | |
1239 | struct vm_area_struct **vmas, int *nonblocking); | |
1240 | long get_user_pages(struct task_struct *tsk, struct mm_struct *mm, | |
1241 | unsigned long start, unsigned long nr_pages, | |
1242 | int write, int force, struct page **pages, | |
1243 | struct vm_area_struct **vmas); | |
f0818f47 AA |
1244 | long get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm, |
1245 | unsigned long start, unsigned long nr_pages, | |
1246 | int write, int force, struct page **pages, | |
1247 | int *locked); | |
0fd71a56 AA |
1248 | long __get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm, |
1249 | unsigned long start, unsigned long nr_pages, | |
1250 | int write, int force, struct page **pages, | |
1251 | unsigned int gup_flags); | |
f0818f47 AA |
1252 | long get_user_pages_unlocked(struct task_struct *tsk, struct mm_struct *mm, |
1253 | unsigned long start, unsigned long nr_pages, | |
1254 | int write, int force, struct page **pages); | |
d2bf6be8 NP |
1255 | int get_user_pages_fast(unsigned long start, int nr_pages, int write, |
1256 | struct page **pages); | |
8025e5dd JK |
1257 | |
1258 | /* Container for pinned pfns / pages */ | |
1259 | struct frame_vector { | |
1260 | unsigned int nr_allocated; /* Number of frames we have space for */ | |
1261 | unsigned int nr_frames; /* Number of frames stored in ptrs array */ | |
1262 | bool got_ref; /* Did we pin pages by getting page ref? */ | |
1263 | bool is_pfns; /* Does array contain pages or pfns? */ | |
1264 | void *ptrs[0]; /* Array of pinned pfns / pages. Use | |
1265 | * pfns_vector_pages() or pfns_vector_pfns() | |
1266 | * for access */ | |
1267 | }; | |
1268 | ||
1269 | struct frame_vector *frame_vector_create(unsigned int nr_frames); | |
1270 | void frame_vector_destroy(struct frame_vector *vec); | |
1271 | int get_vaddr_frames(unsigned long start, unsigned int nr_pfns, | |
1272 | bool write, bool force, struct frame_vector *vec); | |
1273 | void put_vaddr_frames(struct frame_vector *vec); | |
1274 | int frame_vector_to_pages(struct frame_vector *vec); | |
1275 | void frame_vector_to_pfns(struct frame_vector *vec); | |
1276 | ||
1277 | static inline unsigned int frame_vector_count(struct frame_vector *vec) | |
1278 | { | |
1279 | return vec->nr_frames; | |
1280 | } | |
1281 | ||
1282 | static inline struct page **frame_vector_pages(struct frame_vector *vec) | |
1283 | { | |
1284 | if (vec->is_pfns) { | |
1285 | int err = frame_vector_to_pages(vec); | |
1286 | ||
1287 | if (err) | |
1288 | return ERR_PTR(err); | |
1289 | } | |
1290 | return (struct page **)(vec->ptrs); | |
1291 | } | |
1292 | ||
1293 | static inline unsigned long *frame_vector_pfns(struct frame_vector *vec) | |
1294 | { | |
1295 | if (!vec->is_pfns) | |
1296 | frame_vector_to_pfns(vec); | |
1297 | return (unsigned long *)(vec->ptrs); | |
1298 | } | |
1299 | ||
18022c5d MG |
1300 | struct kvec; |
1301 | int get_kernel_pages(const struct kvec *iov, int nr_pages, int write, | |
1302 | struct page **pages); | |
1303 | int get_kernel_page(unsigned long start, int write, struct page **pages); | |
f3e8fccd | 1304 | struct page *get_dump_page(unsigned long addr); |
1da177e4 | 1305 | |
cf9a2ae8 | 1306 | extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
d47992f8 LC |
1307 | extern void do_invalidatepage(struct page *page, unsigned int offset, |
1308 | unsigned int length); | |
cf9a2ae8 | 1309 | |
1da177e4 | 1310 | int __set_page_dirty_nobuffers(struct page *page); |
76719325 | 1311 | int __set_page_dirty_no_writeback(struct page *page); |
1da177e4 LT |
1312 | int redirty_page_for_writepage(struct writeback_control *wbc, |
1313 | struct page *page); | |
c4843a75 GT |
1314 | void account_page_dirtied(struct page *page, struct address_space *mapping, |
1315 | struct mem_cgroup *memcg); | |
1316 | void account_page_cleaned(struct page *page, struct address_space *mapping, | |
682aa8e1 | 1317 | struct mem_cgroup *memcg, struct bdi_writeback *wb); |
b3c97528 | 1318 | int set_page_dirty(struct page *page); |
1da177e4 | 1319 | int set_page_dirty_lock(struct page *page); |
11f81bec | 1320 | void cancel_dirty_page(struct page *page); |
1da177e4 | 1321 | int clear_page_dirty_for_io(struct page *page); |
b9ea2515 | 1322 | |
a9090253 | 1323 | int get_cmdline(struct task_struct *task, char *buffer, int buflen); |
1da177e4 | 1324 | |
39aa3cb3 | 1325 | /* Is the vma a continuation of the stack vma above it? */ |
a09a79f6 | 1326 | static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr) |
39aa3cb3 SB |
1327 | { |
1328 | return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN); | |
1329 | } | |
1330 | ||
b5330628 ON |
1331 | static inline bool vma_is_anonymous(struct vm_area_struct *vma) |
1332 | { | |
1333 | return !vma->vm_ops; | |
1334 | } | |
1335 | ||
a09a79f6 MP |
1336 | static inline int stack_guard_page_start(struct vm_area_struct *vma, |
1337 | unsigned long addr) | |
1338 | { | |
1339 | return (vma->vm_flags & VM_GROWSDOWN) && | |
1340 | (vma->vm_start == addr) && | |
1341 | !vma_growsdown(vma->vm_prev, addr); | |
1342 | } | |
1343 | ||
1344 | /* Is the vma a continuation of the stack vma below it? */ | |
1345 | static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr) | |
1346 | { | |
1347 | return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP); | |
1348 | } | |
1349 | ||
1350 | static inline int stack_guard_page_end(struct vm_area_struct *vma, | |
1351 | unsigned long addr) | |
1352 | { | |
1353 | return (vma->vm_flags & VM_GROWSUP) && | |
1354 | (vma->vm_end == addr) && | |
1355 | !vma_growsup(vma->vm_next, addr); | |
1356 | } | |
1357 | ||
58cb6548 ON |
1358 | extern struct task_struct *task_of_stack(struct task_struct *task, |
1359 | struct vm_area_struct *vma, bool in_group); | |
b7643757 | 1360 | |
b6a2fea3 OW |
1361 | extern unsigned long move_page_tables(struct vm_area_struct *vma, |
1362 | unsigned long old_addr, struct vm_area_struct *new_vma, | |
38a76013 ML |
1363 | unsigned long new_addr, unsigned long len, |
1364 | bool need_rmap_locks); | |
7da4d641 PZ |
1365 | extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start, |
1366 | unsigned long end, pgprot_t newprot, | |
4b10e7d5 | 1367 | int dirty_accountable, int prot_numa); |
b6a2fea3 OW |
1368 | extern int mprotect_fixup(struct vm_area_struct *vma, |
1369 | struct vm_area_struct **pprev, unsigned long start, | |
1370 | unsigned long end, unsigned long newflags); | |
1da177e4 | 1371 | |
465a454f PZ |
1372 | /* |
1373 | * doesn't attempt to fault and will return short. | |
1374 | */ | |
1375 | int __get_user_pages_fast(unsigned long start, int nr_pages, int write, | |
1376 | struct page **pages); | |
d559db08 KH |
1377 | /* |
1378 | * per-process(per-mm_struct) statistics. | |
1379 | */ | |
d559db08 KH |
1380 | static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) |
1381 | { | |
69c97823 KK |
1382 | long val = atomic_long_read(&mm->rss_stat.count[member]); |
1383 | ||
1384 | #ifdef SPLIT_RSS_COUNTING | |
1385 | /* | |
1386 | * counter is updated in asynchronous manner and may go to minus. | |
1387 | * But it's never be expected number for users. | |
1388 | */ | |
1389 | if (val < 0) | |
1390 | val = 0; | |
172703b0 | 1391 | #endif |
69c97823 KK |
1392 | return (unsigned long)val; |
1393 | } | |
d559db08 KH |
1394 | |
1395 | static inline void add_mm_counter(struct mm_struct *mm, int member, long value) | |
1396 | { | |
172703b0 | 1397 | atomic_long_add(value, &mm->rss_stat.count[member]); |
d559db08 KH |
1398 | } |
1399 | ||
1400 | static inline void inc_mm_counter(struct mm_struct *mm, int member) | |
1401 | { | |
172703b0 | 1402 | atomic_long_inc(&mm->rss_stat.count[member]); |
d559db08 KH |
1403 | } |
1404 | ||
1405 | static inline void dec_mm_counter(struct mm_struct *mm, int member) | |
1406 | { | |
172703b0 | 1407 | atomic_long_dec(&mm->rss_stat.count[member]); |
d559db08 KH |
1408 | } |
1409 | ||
d559db08 KH |
1410 | static inline unsigned long get_mm_rss(struct mm_struct *mm) |
1411 | { | |
1412 | return get_mm_counter(mm, MM_FILEPAGES) + | |
1413 | get_mm_counter(mm, MM_ANONPAGES); | |
1414 | } | |
1415 | ||
1416 | static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) | |
1417 | { | |
1418 | return max(mm->hiwater_rss, get_mm_rss(mm)); | |
1419 | } | |
1420 | ||
1421 | static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) | |
1422 | { | |
1423 | return max(mm->hiwater_vm, mm->total_vm); | |
1424 | } | |
1425 | ||
1426 | static inline void update_hiwater_rss(struct mm_struct *mm) | |
1427 | { | |
1428 | unsigned long _rss = get_mm_rss(mm); | |
1429 | ||
1430 | if ((mm)->hiwater_rss < _rss) | |
1431 | (mm)->hiwater_rss = _rss; | |
1432 | } | |
1433 | ||
1434 | static inline void update_hiwater_vm(struct mm_struct *mm) | |
1435 | { | |
1436 | if (mm->hiwater_vm < mm->total_vm) | |
1437 | mm->hiwater_vm = mm->total_vm; | |
1438 | } | |
1439 | ||
695f0559 PC |
1440 | static inline void reset_mm_hiwater_rss(struct mm_struct *mm) |
1441 | { | |
1442 | mm->hiwater_rss = get_mm_rss(mm); | |
1443 | } | |
1444 | ||
d559db08 KH |
1445 | static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, |
1446 | struct mm_struct *mm) | |
1447 | { | |
1448 | unsigned long hiwater_rss = get_mm_hiwater_rss(mm); | |
1449 | ||
1450 | if (*maxrss < hiwater_rss) | |
1451 | *maxrss = hiwater_rss; | |
1452 | } | |
1453 | ||
53bddb4e | 1454 | #if defined(SPLIT_RSS_COUNTING) |
05af2e10 | 1455 | void sync_mm_rss(struct mm_struct *mm); |
53bddb4e | 1456 | #else |
05af2e10 | 1457 | static inline void sync_mm_rss(struct mm_struct *mm) |
53bddb4e KH |
1458 | { |
1459 | } | |
1460 | #endif | |
465a454f | 1461 | |
4e950f6f | 1462 | int vma_wants_writenotify(struct vm_area_struct *vma); |
d08b3851 | 1463 | |
25ca1d6c NK |
1464 | extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr, |
1465 | spinlock_t **ptl); | |
1466 | static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, | |
1467 | spinlock_t **ptl) | |
1468 | { | |
1469 | pte_t *ptep; | |
1470 | __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl)); | |
1471 | return ptep; | |
1472 | } | |
c9cfcddf | 1473 | |
5f22df00 NP |
1474 | #ifdef __PAGETABLE_PUD_FOLDED |
1475 | static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, | |
1476 | unsigned long address) | |
1477 | { | |
1478 | return 0; | |
1479 | } | |
1480 | #else | |
1bb3630e | 1481 | int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); |
5f22df00 NP |
1482 | #endif |
1483 | ||
2d2f5119 | 1484 | #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU) |
5f22df00 NP |
1485 | static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, |
1486 | unsigned long address) | |
1487 | { | |
1488 | return 0; | |
1489 | } | |
dc6c9a35 | 1490 | |
2d2f5119 KS |
1491 | static inline void mm_nr_pmds_init(struct mm_struct *mm) {} |
1492 | ||
dc6c9a35 KS |
1493 | static inline unsigned long mm_nr_pmds(struct mm_struct *mm) |
1494 | { | |
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) {} | |
1499 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) {} | |
1500 | ||
5f22df00 | 1501 | #else |
1bb3630e | 1502 | int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
dc6c9a35 | 1503 | |
2d2f5119 KS |
1504 | static inline void mm_nr_pmds_init(struct mm_struct *mm) |
1505 | { | |
1506 | atomic_long_set(&mm->nr_pmds, 0); | |
1507 | } | |
1508 | ||
dc6c9a35 KS |
1509 | static inline unsigned long mm_nr_pmds(struct mm_struct *mm) |
1510 | { | |
1511 | return atomic_long_read(&mm->nr_pmds); | |
1512 | } | |
1513 | ||
1514 | static inline void mm_inc_nr_pmds(struct mm_struct *mm) | |
1515 | { | |
1516 | atomic_long_inc(&mm->nr_pmds); | |
1517 | } | |
1518 | ||
1519 | static inline void mm_dec_nr_pmds(struct mm_struct *mm) | |
1520 | { | |
1521 | atomic_long_dec(&mm->nr_pmds); | |
1522 | } | |
5f22df00 NP |
1523 | #endif |
1524 | ||
8ac1f832 AA |
1525 | int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma, |
1526 | pmd_t *pmd, unsigned long address); | |
1bb3630e HD |
1527 | int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); |
1528 | ||
1da177e4 LT |
1529 | /* |
1530 | * The following ifdef needed to get the 4level-fixup.h header to work. | |
1531 | * Remove it when 4level-fixup.h has been removed. | |
1532 | */ | |
1bb3630e | 1533 | #if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) |
1da177e4 LT |
1534 | static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) |
1535 | { | |
1bb3630e HD |
1536 | return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))? |
1537 | NULL: pud_offset(pgd, address); | |
1da177e4 LT |
1538 | } |
1539 | ||
1540 | static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) | |
1541 | { | |
1bb3630e HD |
1542 | return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
1543 | NULL: pmd_offset(pud, address); | |
1da177e4 | 1544 | } |
1bb3630e HD |
1545 | #endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ |
1546 | ||
57c1ffce | 1547 | #if USE_SPLIT_PTE_PTLOCKS |
597d795a | 1548 | #if ALLOC_SPLIT_PTLOCKS |
b35f1819 | 1549 | void __init ptlock_cache_init(void); |
539edb58 PZ |
1550 | extern bool ptlock_alloc(struct page *page); |
1551 | extern void ptlock_free(struct page *page); | |
1552 | ||
1553 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
1554 | { | |
1555 | return page->ptl; | |
1556 | } | |
597d795a | 1557 | #else /* ALLOC_SPLIT_PTLOCKS */ |
b35f1819 KS |
1558 | static inline void ptlock_cache_init(void) |
1559 | { | |
1560 | } | |
1561 | ||
49076ec2 KS |
1562 | static inline bool ptlock_alloc(struct page *page) |
1563 | { | |
49076ec2 KS |
1564 | return true; |
1565 | } | |
539edb58 | 1566 | |
49076ec2 KS |
1567 | static inline void ptlock_free(struct page *page) |
1568 | { | |
49076ec2 KS |
1569 | } |
1570 | ||
1571 | static inline spinlock_t *ptlock_ptr(struct page *page) | |
1572 | { | |
539edb58 | 1573 | return &page->ptl; |
49076ec2 | 1574 | } |
597d795a | 1575 | #endif /* ALLOC_SPLIT_PTLOCKS */ |
49076ec2 KS |
1576 | |
1577 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) | |
1578 | { | |
1579 | return ptlock_ptr(pmd_page(*pmd)); | |
1580 | } | |
1581 | ||
1582 | static inline bool ptlock_init(struct page *page) | |
1583 | { | |
1584 | /* | |
1585 | * prep_new_page() initialize page->private (and therefore page->ptl) | |
1586 | * with 0. Make sure nobody took it in use in between. | |
1587 | * | |
1588 | * It can happen if arch try to use slab for page table allocation: | |
1589 | * slab code uses page->slab_cache and page->first_page (for tail | |
1590 | * pages), which share storage with page->ptl. | |
1591 | */ | |
309381fe | 1592 | VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page); |
49076ec2 KS |
1593 | if (!ptlock_alloc(page)) |
1594 | return false; | |
1595 | spin_lock_init(ptlock_ptr(page)); | |
1596 | return true; | |
1597 | } | |
1598 | ||
1599 | /* Reset page->mapping so free_pages_check won't complain. */ | |
1600 | static inline void pte_lock_deinit(struct page *page) | |
1601 | { | |
1602 | page->mapping = NULL; | |
1603 | ptlock_free(page); | |
1604 | } | |
1605 | ||
57c1ffce | 1606 | #else /* !USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 HD |
1607 | /* |
1608 | * We use mm->page_table_lock to guard all pagetable pages of the mm. | |
1609 | */ | |
49076ec2 KS |
1610 | static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1611 | { | |
1612 | return &mm->page_table_lock; | |
1613 | } | |
b35f1819 | 1614 | static inline void ptlock_cache_init(void) {} |
49076ec2 KS |
1615 | static inline bool ptlock_init(struct page *page) { return true; } |
1616 | static inline void pte_lock_deinit(struct page *page) {} | |
57c1ffce | 1617 | #endif /* USE_SPLIT_PTE_PTLOCKS */ |
4c21e2f2 | 1618 | |
b35f1819 KS |
1619 | static inline void pgtable_init(void) |
1620 | { | |
1621 | ptlock_cache_init(); | |
1622 | pgtable_cache_init(); | |
1623 | } | |
1624 | ||
390f44e2 | 1625 | static inline bool pgtable_page_ctor(struct page *page) |
2f569afd | 1626 | { |
706874e9 VD |
1627 | if (!ptlock_init(page)) |
1628 | return false; | |
2f569afd | 1629 | inc_zone_page_state(page, NR_PAGETABLE); |
706874e9 | 1630 | return true; |
2f569afd MS |
1631 | } |
1632 | ||
1633 | static inline void pgtable_page_dtor(struct page *page) | |
1634 | { | |
1635 | pte_lock_deinit(page); | |
1636 | dec_zone_page_state(page, NR_PAGETABLE); | |
1637 | } | |
1638 | ||
c74df32c HD |
1639 | #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
1640 | ({ \ | |
4c21e2f2 | 1641 | spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
c74df32c HD |
1642 | pte_t *__pte = pte_offset_map(pmd, address); \ |
1643 | *(ptlp) = __ptl; \ | |
1644 | spin_lock(__ptl); \ | |
1645 | __pte; \ | |
1646 | }) | |
1647 | ||
1648 | #define pte_unmap_unlock(pte, ptl) do { \ | |
1649 | spin_unlock(ptl); \ | |
1650 | pte_unmap(pte); \ | |
1651 | } while (0) | |
1652 | ||
8ac1f832 AA |
1653 | #define pte_alloc_map(mm, vma, pmd, address) \ |
1654 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \ | |
1655 | pmd, address))? \ | |
1656 | NULL: pte_offset_map(pmd, address)) | |
1bb3630e | 1657 | |
c74df32c | 1658 | #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
8ac1f832 AA |
1659 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \ |
1660 | pmd, address))? \ | |
c74df32c HD |
1661 | NULL: pte_offset_map_lock(mm, pmd, address, ptlp)) |
1662 | ||
1bb3630e | 1663 | #define pte_alloc_kernel(pmd, address) \ |
8ac1f832 | 1664 | ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ |
1bb3630e | 1665 | NULL: pte_offset_kernel(pmd, address)) |
1da177e4 | 1666 | |
e009bb30 KS |
1667 | #if USE_SPLIT_PMD_PTLOCKS |
1668 | ||
634391ac MS |
1669 | static struct page *pmd_to_page(pmd_t *pmd) |
1670 | { | |
1671 | unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1); | |
1672 | return virt_to_page((void *)((unsigned long) pmd & mask)); | |
1673 | } | |
1674 | ||
e009bb30 KS |
1675 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1676 | { | |
634391ac | 1677 | return ptlock_ptr(pmd_to_page(pmd)); |
e009bb30 KS |
1678 | } |
1679 | ||
1680 | static inline bool pgtable_pmd_page_ctor(struct page *page) | |
1681 | { | |
e009bb30 KS |
1682 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1683 | page->pmd_huge_pte = NULL; | |
1684 | #endif | |
49076ec2 | 1685 | return ptlock_init(page); |
e009bb30 KS |
1686 | } |
1687 | ||
1688 | static inline void pgtable_pmd_page_dtor(struct page *page) | |
1689 | { | |
1690 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
309381fe | 1691 | VM_BUG_ON_PAGE(page->pmd_huge_pte, page); |
e009bb30 | 1692 | #endif |
49076ec2 | 1693 | ptlock_free(page); |
e009bb30 KS |
1694 | } |
1695 | ||
634391ac | 1696 | #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte) |
e009bb30 KS |
1697 | |
1698 | #else | |
1699 | ||
9a86cb7b KS |
1700 | static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
1701 | { | |
1702 | return &mm->page_table_lock; | |
1703 | } | |
1704 | ||
e009bb30 KS |
1705 | static inline bool pgtable_pmd_page_ctor(struct page *page) { return true; } |
1706 | static inline void pgtable_pmd_page_dtor(struct page *page) {} | |
1707 | ||
c389a250 | 1708 | #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) |
9a86cb7b | 1709 | |
e009bb30 KS |
1710 | #endif |
1711 | ||
9a86cb7b KS |
1712 | static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) |
1713 | { | |
1714 | spinlock_t *ptl = pmd_lockptr(mm, pmd); | |
1715 | spin_lock(ptl); | |
1716 | return ptl; | |
1717 | } | |
1718 | ||
1da177e4 | 1719 | extern void free_area_init(unsigned long * zones_size); |
9109fb7b JW |
1720 | extern void free_area_init_node(int nid, unsigned long * zones_size, |
1721 | unsigned long zone_start_pfn, unsigned long *zholes_size); | |
49a7f04a DH |
1722 | extern void free_initmem(void); |
1723 | ||
69afade7 JL |
1724 | /* |
1725 | * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) | |
1726 | * into the buddy system. The freed pages will be poisoned with pattern | |
dbe67df4 | 1727 | * "poison" if it's within range [0, UCHAR_MAX]. |
69afade7 JL |
1728 | * Return pages freed into the buddy system. |
1729 | */ | |
11199692 | 1730 | extern unsigned long free_reserved_area(void *start, void *end, |
69afade7 | 1731 | int poison, char *s); |
c3d5f5f0 | 1732 | |
cfa11e08 JL |
1733 | #ifdef CONFIG_HIGHMEM |
1734 | /* | |
1735 | * Free a highmem page into the buddy system, adjusting totalhigh_pages | |
1736 | * and totalram_pages. | |
1737 | */ | |
1738 | extern void free_highmem_page(struct page *page); | |
1739 | #endif | |
69afade7 | 1740 | |
c3d5f5f0 | 1741 | extern void adjust_managed_page_count(struct page *page, long count); |
7ee3d4e8 | 1742 | extern void mem_init_print_info(const char *str); |
69afade7 | 1743 | |
92923ca3 NZ |
1744 | extern void reserve_bootmem_region(unsigned long start, unsigned long end); |
1745 | ||
69afade7 JL |
1746 | /* Free the reserved page into the buddy system, so it gets managed. */ |
1747 | static inline void __free_reserved_page(struct page *page) | |
1748 | { | |
1749 | ClearPageReserved(page); | |
1750 | init_page_count(page); | |
1751 | __free_page(page); | |
1752 | } | |
1753 | ||
1754 | static inline void free_reserved_page(struct page *page) | |
1755 | { | |
1756 | __free_reserved_page(page); | |
1757 | adjust_managed_page_count(page, 1); | |
1758 | } | |
1759 | ||
1760 | static inline void mark_page_reserved(struct page *page) | |
1761 | { | |
1762 | SetPageReserved(page); | |
1763 | adjust_managed_page_count(page, -1); | |
1764 | } | |
1765 | ||
1766 | /* | |
1767 | * Default method to free all the __init memory into the buddy system. | |
dbe67df4 JL |
1768 | * The freed pages will be poisoned with pattern "poison" if it's within |
1769 | * range [0, UCHAR_MAX]. | |
1770 | * Return pages freed into the buddy system. | |
69afade7 JL |
1771 | */ |
1772 | static inline unsigned long free_initmem_default(int poison) | |
1773 | { | |
1774 | extern char __init_begin[], __init_end[]; | |
1775 | ||
11199692 | 1776 | return free_reserved_area(&__init_begin, &__init_end, |
69afade7 JL |
1777 | poison, "unused kernel"); |
1778 | } | |
1779 | ||
7ee3d4e8 JL |
1780 | static inline unsigned long get_num_physpages(void) |
1781 | { | |
1782 | int nid; | |
1783 | unsigned long phys_pages = 0; | |
1784 | ||
1785 | for_each_online_node(nid) | |
1786 | phys_pages += node_present_pages(nid); | |
1787 | ||
1788 | return phys_pages; | |
1789 | } | |
1790 | ||
0ee332c1 | 1791 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
c713216d | 1792 | /* |
0ee332c1 | 1793 | * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its |
c713216d MG |
1794 | * zones, allocate the backing mem_map and account for memory holes in a more |
1795 | * architecture independent manner. This is a substitute for creating the | |
1796 | * zone_sizes[] and zholes_size[] arrays and passing them to | |
1797 | * free_area_init_node() | |
1798 | * | |
1799 | * An architecture is expected to register range of page frames backed by | |
0ee332c1 | 1800 | * physical memory with memblock_add[_node]() before calling |
c713216d MG |
1801 | * free_area_init_nodes() passing in the PFN each zone ends at. At a basic |
1802 | * usage, an architecture is expected to do something like | |
1803 | * | |
1804 | * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, | |
1805 | * max_highmem_pfn}; | |
1806 | * for_each_valid_physical_page_range() | |
0ee332c1 | 1807 | * memblock_add_node(base, size, nid) |
c713216d MG |
1808 | * free_area_init_nodes(max_zone_pfns); |
1809 | * | |
0ee332c1 TH |
1810 | * free_bootmem_with_active_regions() calls free_bootmem_node() for each |
1811 | * registered physical page range. Similarly | |
1812 | * sparse_memory_present_with_active_regions() calls memory_present() for | |
1813 | * each range when SPARSEMEM is enabled. | |
c713216d MG |
1814 | * |
1815 | * See mm/page_alloc.c for more information on each function exposed by | |
0ee332c1 | 1816 | * CONFIG_HAVE_MEMBLOCK_NODE_MAP. |
c713216d MG |
1817 | */ |
1818 | extern void free_area_init_nodes(unsigned long *max_zone_pfn); | |
1e01979c | 1819 | unsigned long node_map_pfn_alignment(void); |
32996250 YL |
1820 | unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, |
1821 | unsigned long end_pfn); | |
c713216d MG |
1822 | extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
1823 | unsigned long end_pfn); | |
1824 | extern void get_pfn_range_for_nid(unsigned int nid, | |
1825 | unsigned long *start_pfn, unsigned long *end_pfn); | |
1826 | extern unsigned long find_min_pfn_with_active_regions(void); | |
c713216d MG |
1827 | extern void free_bootmem_with_active_regions(int nid, |
1828 | unsigned long max_low_pfn); | |
1829 | extern void sparse_memory_present_with_active_regions(int nid); | |
f2dbcfa7 | 1830 | |
0ee332c1 | 1831 | #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ |
f2dbcfa7 | 1832 | |
0ee332c1 | 1833 | #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \ |
f2dbcfa7 | 1834 | !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) |
8a942fde MG |
1835 | static inline int __early_pfn_to_nid(unsigned long pfn, |
1836 | struct mminit_pfnnid_cache *state) | |
f2dbcfa7 KH |
1837 | { |
1838 | return 0; | |
1839 | } | |
1840 | #else | |
1841 | /* please see mm/page_alloc.c */ | |
1842 | extern int __meminit early_pfn_to_nid(unsigned long pfn); | |
f2dbcfa7 | 1843 | /* there is a per-arch backend function. */ |
8a942fde MG |
1844 | extern int __meminit __early_pfn_to_nid(unsigned long pfn, |
1845 | struct mminit_pfnnid_cache *state); | |
f2dbcfa7 KH |
1846 | #endif |
1847 | ||
0e0b864e | 1848 | extern void set_dma_reserve(unsigned long new_dma_reserve); |
a2f3aa02 DH |
1849 | extern void memmap_init_zone(unsigned long, int, unsigned long, |
1850 | unsigned long, enum memmap_context); | |
bc75d33f | 1851 | extern void setup_per_zone_wmarks(void); |
1b79acc9 | 1852 | extern int __meminit init_per_zone_wmark_min(void); |
1da177e4 | 1853 | extern void mem_init(void); |
8feae131 | 1854 | extern void __init mmap_init(void); |
b2b755b5 | 1855 | extern void show_mem(unsigned int flags); |
1da177e4 LT |
1856 | extern void si_meminfo(struct sysinfo * val); |
1857 | extern void si_meminfo_node(struct sysinfo *val, int nid); | |
1858 | ||
3ee9a4f0 JP |
1859 | extern __printf(3, 4) |
1860 | void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...); | |
a238ab5b | 1861 | |
e7c8d5c9 | 1862 | extern void setup_per_cpu_pageset(void); |
e7c8d5c9 | 1863 | |
112067f0 | 1864 | extern void zone_pcp_update(struct zone *zone); |
340175b7 | 1865 | extern void zone_pcp_reset(struct zone *zone); |
112067f0 | 1866 | |
75f7ad8e PS |
1867 | /* page_alloc.c */ |
1868 | extern int min_free_kbytes; | |
1869 | ||
8feae131 | 1870 | /* nommu.c */ |
33e5d769 | 1871 | extern atomic_long_t mmap_pages_allocated; |
7e660872 | 1872 | extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); |
8feae131 | 1873 | |
6b2dbba8 | 1874 | /* interval_tree.c */ |
6b2dbba8 ML |
1875 | void vma_interval_tree_insert(struct vm_area_struct *node, |
1876 | struct rb_root *root); | |
9826a516 ML |
1877 | void vma_interval_tree_insert_after(struct vm_area_struct *node, |
1878 | struct vm_area_struct *prev, | |
1879 | struct rb_root *root); | |
6b2dbba8 ML |
1880 | void vma_interval_tree_remove(struct vm_area_struct *node, |
1881 | struct rb_root *root); | |
1882 | struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root *root, | |
1883 | unsigned long start, unsigned long last); | |
1884 | struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node, | |
1885 | unsigned long start, unsigned long last); | |
1886 | ||
1887 | #define vma_interval_tree_foreach(vma, root, start, last) \ | |
1888 | for (vma = vma_interval_tree_iter_first(root, start, last); \ | |
1889 | vma; vma = vma_interval_tree_iter_next(vma, start, last)) | |
1da177e4 | 1890 | |
bf181b9f ML |
1891 | void anon_vma_interval_tree_insert(struct anon_vma_chain *node, |
1892 | struct rb_root *root); | |
1893 | void anon_vma_interval_tree_remove(struct anon_vma_chain *node, | |
1894 | struct rb_root *root); | |
1895 | struct anon_vma_chain *anon_vma_interval_tree_iter_first( | |
1896 | struct rb_root *root, unsigned long start, unsigned long last); | |
1897 | struct anon_vma_chain *anon_vma_interval_tree_iter_next( | |
1898 | struct anon_vma_chain *node, unsigned long start, unsigned long last); | |
ed8ea815 ML |
1899 | #ifdef CONFIG_DEBUG_VM_RB |
1900 | void anon_vma_interval_tree_verify(struct anon_vma_chain *node); | |
1901 | #endif | |
bf181b9f ML |
1902 | |
1903 | #define anon_vma_interval_tree_foreach(avc, root, start, last) \ | |
1904 | for (avc = anon_vma_interval_tree_iter_first(root, start, last); \ | |
1905 | avc; avc = anon_vma_interval_tree_iter_next(avc, start, last)) | |
1906 | ||
1da177e4 | 1907 | /* mmap.c */ |
34b4e4aa | 1908 | extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
5beb4930 | 1909 | extern int vma_adjust(struct vm_area_struct *vma, unsigned long start, |
1da177e4 LT |
1910 | unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert); |
1911 | extern struct vm_area_struct *vma_merge(struct mm_struct *, | |
1912 | struct vm_area_struct *prev, unsigned long addr, unsigned long end, | |
1913 | unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, | |
19a809af | 1914 | struct mempolicy *, struct vm_userfaultfd_ctx); |
1da177e4 LT |
1915 | extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); |
1916 | extern int split_vma(struct mm_struct *, | |
1917 | struct vm_area_struct *, unsigned long addr, int new_below); | |
1918 | extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); | |
1919 | extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, | |
1920 | struct rb_node **, struct rb_node *); | |
a8fb5618 | 1921 | extern void unlink_file_vma(struct vm_area_struct *); |
1da177e4 | 1922 | extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
38a76013 ML |
1923 | unsigned long addr, unsigned long len, pgoff_t pgoff, |
1924 | bool *need_rmap_locks); | |
1da177e4 | 1925 | extern void exit_mmap(struct mm_struct *); |
925d1c40 | 1926 | |
9c599024 CG |
1927 | static inline int check_data_rlimit(unsigned long rlim, |
1928 | unsigned long new, | |
1929 | unsigned long start, | |
1930 | unsigned long end_data, | |
1931 | unsigned long start_data) | |
1932 | { | |
1933 | if (rlim < RLIM_INFINITY) { | |
1934 | if (((new - start) + (end_data - start_data)) > rlim) | |
1935 | return -ENOSPC; | |
1936 | } | |
1937 | ||
1938 | return 0; | |
1939 | } | |
1940 | ||
7906d00c AA |
1941 | extern int mm_take_all_locks(struct mm_struct *mm); |
1942 | extern void mm_drop_all_locks(struct mm_struct *mm); | |
1943 | ||
38646013 JS |
1944 | extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
1945 | extern struct file *get_mm_exe_file(struct mm_struct *mm); | |
925d1c40 | 1946 | |
119f657c | 1947 | extern int may_expand_vm(struct mm_struct *mm, unsigned long npages); |
3935ed6a SS |
1948 | extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm, |
1949 | unsigned long addr, unsigned long len, | |
a62c34bd AL |
1950 | unsigned long flags, |
1951 | const struct vm_special_mapping *spec); | |
1952 | /* This is an obsolete alternative to _install_special_mapping. */ | |
fa5dc22f RM |
1953 | extern int install_special_mapping(struct mm_struct *mm, |
1954 | unsigned long addr, unsigned long len, | |
1955 | unsigned long flags, struct page **pages); | |
1da177e4 LT |
1956 | |
1957 | extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
1958 | ||
0165ab44 | 1959 | extern unsigned long mmap_region(struct file *file, unsigned long addr, |
c22c0d63 | 1960 | unsigned long len, vm_flags_t vm_flags, unsigned long pgoff); |
1fcfd8db | 1961 | extern unsigned long do_mmap(struct file *file, unsigned long addr, |
bebeb3d6 | 1962 | unsigned long len, unsigned long prot, unsigned long flags, |
1fcfd8db | 1963 | vm_flags_t vm_flags, unsigned long pgoff, unsigned long *populate); |
1da177e4 LT |
1964 | extern int do_munmap(struct mm_struct *, unsigned long, size_t); |
1965 | ||
1fcfd8db ON |
1966 | static inline unsigned long |
1967 | do_mmap_pgoff(struct file *file, unsigned long addr, | |
1968 | unsigned long len, unsigned long prot, unsigned long flags, | |
1969 | unsigned long pgoff, unsigned long *populate) | |
1970 | { | |
1971 | return do_mmap(file, addr, len, prot, flags, 0, pgoff, populate); | |
1972 | } | |
1973 | ||
bebeb3d6 ML |
1974 | #ifdef CONFIG_MMU |
1975 | extern int __mm_populate(unsigned long addr, unsigned long len, | |
1976 | int ignore_errors); | |
1977 | static inline void mm_populate(unsigned long addr, unsigned long len) | |
1978 | { | |
1979 | /* Ignore errors */ | |
1980 | (void) __mm_populate(addr, len, 1); | |
1981 | } | |
1982 | #else | |
1983 | static inline void mm_populate(unsigned long addr, unsigned long len) {} | |
1984 | #endif | |
1985 | ||
e4eb1ff6 LT |
1986 | /* These take the mm semaphore themselves */ |
1987 | extern unsigned long vm_brk(unsigned long, unsigned long); | |
bfce281c | 1988 | extern int vm_munmap(unsigned long, size_t); |
6be5ceb0 LT |
1989 | extern unsigned long vm_mmap(struct file *, unsigned long, |
1990 | unsigned long, unsigned long, | |
1991 | unsigned long, unsigned long); | |
1da177e4 | 1992 | |
db4fbfb9 ML |
1993 | struct vm_unmapped_area_info { |
1994 | #define VM_UNMAPPED_AREA_TOPDOWN 1 | |
1995 | unsigned long flags; | |
1996 | unsigned long length; | |
1997 | unsigned long low_limit; | |
1998 | unsigned long high_limit; | |
1999 | unsigned long align_mask; | |
2000 | unsigned long align_offset; | |
2001 | }; | |
2002 | ||
2003 | extern unsigned long unmapped_area(struct vm_unmapped_area_info *info); | |
2004 | extern unsigned long unmapped_area_topdown(struct vm_unmapped_area_info *info); | |
2005 | ||
2006 | /* | |
2007 | * Search for an unmapped address range. | |
2008 | * | |
2009 | * We are looking for a range that: | |
2010 | * - does not intersect with any VMA; | |
2011 | * - is contained within the [low_limit, high_limit) interval; | |
2012 | * - is at least the desired size. | |
2013 | * - satisfies (begin_addr & align_mask) == (align_offset & align_mask) | |
2014 | */ | |
2015 | static inline unsigned long | |
2016 | vm_unmapped_area(struct vm_unmapped_area_info *info) | |
2017 | { | |
cdd7875e | 2018 | if (info->flags & VM_UNMAPPED_AREA_TOPDOWN) |
db4fbfb9 | 2019 | return unmapped_area_topdown(info); |
cdd7875e BP |
2020 | else |
2021 | return unmapped_area(info); | |
db4fbfb9 ML |
2022 | } |
2023 | ||
85821aab | 2024 | /* truncate.c */ |
1da177e4 | 2025 | extern void truncate_inode_pages(struct address_space *, loff_t); |
d7339071 HR |
2026 | extern void truncate_inode_pages_range(struct address_space *, |
2027 | loff_t lstart, loff_t lend); | |
91b0abe3 | 2028 | extern void truncate_inode_pages_final(struct address_space *); |
1da177e4 LT |
2029 | |
2030 | /* generic vm_area_ops exported for stackable file systems */ | |
d0217ac0 | 2031 | extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); |
f1820361 | 2032 | extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf); |
4fcf1c62 | 2033 | extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); |
1da177e4 LT |
2034 | |
2035 | /* mm/page-writeback.c */ | |
2036 | int write_one_page(struct page *page, int wait); | |
1cf6e7d8 | 2037 | void task_dirty_inc(struct task_struct *tsk); |
1da177e4 LT |
2038 | |
2039 | /* readahead.c */ | |
2040 | #define VM_MAX_READAHEAD 128 /* kbytes */ | |
2041 | #define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ | |
1da177e4 | 2042 | |
1da177e4 | 2043 | int force_page_cache_readahead(struct address_space *mapping, struct file *filp, |
7361f4d8 | 2044 | pgoff_t offset, unsigned long nr_to_read); |
cf914a7d RR |
2045 | |
2046 | void page_cache_sync_readahead(struct address_space *mapping, | |
2047 | struct file_ra_state *ra, | |
2048 | struct file *filp, | |
2049 | pgoff_t offset, | |
2050 | unsigned long size); | |
2051 | ||
2052 | void page_cache_async_readahead(struct address_space *mapping, | |
2053 | struct file_ra_state *ra, | |
2054 | struct file *filp, | |
2055 | struct page *pg, | |
2056 | pgoff_t offset, | |
2057 | unsigned long size); | |
2058 | ||
d05f3169 | 2059 | /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ |
46dea3d0 | 2060 | extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
d05f3169 MH |
2061 | |
2062 | /* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */ | |
2063 | extern int expand_downwards(struct vm_area_struct *vma, | |
2064 | unsigned long address); | |
8ca3eb08 | 2065 | #if VM_GROWSUP |
46dea3d0 | 2066 | extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
8ca3eb08 | 2067 | #else |
fee7e49d | 2068 | #define expand_upwards(vma, address) (0) |
9ab88515 | 2069 | #endif |
1da177e4 LT |
2070 | |
2071 | /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ | |
2072 | extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); | |
2073 | extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, | |
2074 | struct vm_area_struct **pprev); | |
2075 | ||
2076 | /* Look up the first VMA which intersects the interval start_addr..end_addr-1, | |
2077 | NULL if none. Assume start_addr < end_addr. */ | |
2078 | static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) | |
2079 | { | |
2080 | struct vm_area_struct * vma = find_vma(mm,start_addr); | |
2081 | ||
2082 | if (vma && end_addr <= vma->vm_start) | |
2083 | vma = NULL; | |
2084 | return vma; | |
2085 | } | |
2086 | ||
2087 | static inline unsigned long vma_pages(struct vm_area_struct *vma) | |
2088 | { | |
2089 | return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
2090 | } | |
2091 | ||
640708a2 PE |
2092 | /* Look up the first VMA which exactly match the interval vm_start ... vm_end */ |
2093 | static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, | |
2094 | unsigned long vm_start, unsigned long vm_end) | |
2095 | { | |
2096 | struct vm_area_struct *vma = find_vma(mm, vm_start); | |
2097 | ||
2098 | if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end)) | |
2099 | vma = NULL; | |
2100 | ||
2101 | return vma; | |
2102 | } | |
2103 | ||
bad849b3 | 2104 | #ifdef CONFIG_MMU |
804af2cf | 2105 | pgprot_t vm_get_page_prot(unsigned long vm_flags); |
64e45507 | 2106 | void vma_set_page_prot(struct vm_area_struct *vma); |
bad849b3 DH |
2107 | #else |
2108 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) | |
2109 | { | |
2110 | return __pgprot(0); | |
2111 | } | |
64e45507 PF |
2112 | static inline void vma_set_page_prot(struct vm_area_struct *vma) |
2113 | { | |
2114 | vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); | |
2115 | } | |
bad849b3 DH |
2116 | #endif |
2117 | ||
5877231f | 2118 | #ifdef CONFIG_NUMA_BALANCING |
4b10e7d5 | 2119 | unsigned long change_prot_numa(struct vm_area_struct *vma, |
b24f53a0 LS |
2120 | unsigned long start, unsigned long end); |
2121 | #endif | |
2122 | ||
deceb6cd | 2123 | struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
deceb6cd HD |
2124 | int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
2125 | unsigned long pfn, unsigned long size, pgprot_t); | |
a145dd41 | 2126 | int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
e0dc0d8f NP |
2127 | int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
2128 | unsigned long pfn); | |
423bad60 NP |
2129 | int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
2130 | unsigned long pfn); | |
b4cbb197 LT |
2131 | int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len); |
2132 | ||
deceb6cd | 2133 | |
240aadee ML |
2134 | struct page *follow_page_mask(struct vm_area_struct *vma, |
2135 | unsigned long address, unsigned int foll_flags, | |
2136 | unsigned int *page_mask); | |
2137 | ||
2138 | static inline struct page *follow_page(struct vm_area_struct *vma, | |
2139 | unsigned long address, unsigned int foll_flags) | |
2140 | { | |
2141 | unsigned int unused_page_mask; | |
2142 | return follow_page_mask(vma, address, foll_flags, &unused_page_mask); | |
2143 | } | |
2144 | ||
deceb6cd HD |
2145 | #define FOLL_WRITE 0x01 /* check pte is writable */ |
2146 | #define FOLL_TOUCH 0x02 /* mark page accessed */ | |
2147 | #define FOLL_GET 0x04 /* do get_page on page */ | |
8e4b9a60 | 2148 | #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ |
58fa879e | 2149 | #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ |
318b275f GN |
2150 | #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO |
2151 | * and return without waiting upon it */ | |
84d33df2 | 2152 | #define FOLL_POPULATE 0x40 /* fault in page */ |
500d65d4 | 2153 | #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */ |
69ebb83e | 2154 | #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */ |
0b9d7052 | 2155 | #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */ |
5117b3b8 | 2156 | #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */ |
234b239b | 2157 | #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */ |
de60f5f1 | 2158 | #define FOLL_MLOCK 0x1000 /* lock present pages */ |
1da177e4 | 2159 | |
2f569afd | 2160 | typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, |
aee16b3c JF |
2161 | void *data); |
2162 | extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, | |
2163 | unsigned long size, pte_fn_t fn, void *data); | |
2164 | ||
1da177e4 | 2165 | #ifdef CONFIG_PROC_FS |
ab50b8ed | 2166 | void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long); |
1da177e4 | 2167 | #else |
ab50b8ed | 2168 | static inline void vm_stat_account(struct mm_struct *mm, |
1da177e4 LT |
2169 | unsigned long flags, struct file *file, long pages) |
2170 | { | |
44de9d0c | 2171 | mm->total_vm += pages; |
1da177e4 LT |
2172 | } |
2173 | #endif /* CONFIG_PROC_FS */ | |
2174 | ||
12d6f21e | 2175 | #ifdef CONFIG_DEBUG_PAGEALLOC |
031bc574 JK |
2176 | extern bool _debug_pagealloc_enabled; |
2177 | extern void __kernel_map_pages(struct page *page, int numpages, int enable); | |
2178 | ||
2179 | static inline bool debug_pagealloc_enabled(void) | |
2180 | { | |
2181 | return _debug_pagealloc_enabled; | |
2182 | } | |
2183 | ||
2184 | static inline void | |
2185 | kernel_map_pages(struct page *page, int numpages, int enable) | |
2186 | { | |
2187 | if (!debug_pagealloc_enabled()) | |
2188 | return; | |
2189 | ||
2190 | __kernel_map_pages(page, numpages, enable); | |
2191 | } | |
8a235efa RW |
2192 | #ifdef CONFIG_HIBERNATION |
2193 | extern bool kernel_page_present(struct page *page); | |
2194 | #endif /* CONFIG_HIBERNATION */ | |
12d6f21e | 2195 | #else |
1da177e4 | 2196 | static inline void |
9858db50 | 2197 | kernel_map_pages(struct page *page, int numpages, int enable) {} |
8a235efa RW |
2198 | #ifdef CONFIG_HIBERNATION |
2199 | static inline bool kernel_page_present(struct page *page) { return true; } | |
2200 | #endif /* CONFIG_HIBERNATION */ | |
1da177e4 LT |
2201 | #endif |
2202 | ||
a6c19dfe | 2203 | #ifdef __HAVE_ARCH_GATE_AREA |
31db58b3 | 2204 | extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); |
a6c19dfe AL |
2205 | extern int in_gate_area_no_mm(unsigned long addr); |
2206 | extern int in_gate_area(struct mm_struct *mm, unsigned long addr); | |
1da177e4 | 2207 | #else |
a6c19dfe AL |
2208 | static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
2209 | { | |
2210 | return NULL; | |
2211 | } | |
2212 | static inline int in_gate_area_no_mm(unsigned long addr) { return 0; } | |
2213 | static inline int in_gate_area(struct mm_struct *mm, unsigned long addr) | |
2214 | { | |
2215 | return 0; | |
2216 | } | |
1da177e4 LT |
2217 | #endif /* __HAVE_ARCH_GATE_AREA */ |
2218 | ||
146732ce JT |
2219 | #ifdef CONFIG_SYSCTL |
2220 | extern int sysctl_drop_caches; | |
8d65af78 | 2221 | int drop_caches_sysctl_handler(struct ctl_table *, int, |
9d0243bc | 2222 | void __user *, size_t *, loff_t *); |
146732ce JT |
2223 | #endif |
2224 | ||
cb731d6c VD |
2225 | void drop_slab(void); |
2226 | void drop_slab_node(int nid); | |
9d0243bc | 2227 | |
7a9166e3 LY |
2228 | #ifndef CONFIG_MMU |
2229 | #define randomize_va_space 0 | |
2230 | #else | |
a62eaf15 | 2231 | extern int randomize_va_space; |
7a9166e3 | 2232 | #endif |
a62eaf15 | 2233 | |
045e72ac | 2234 | const char * arch_vma_name(struct vm_area_struct *vma); |
03252919 | 2235 | void print_vma_addr(char *prefix, unsigned long rip); |
e6e5494c | 2236 | |
9bdac914 YL |
2237 | void sparse_mem_maps_populate_node(struct page **map_map, |
2238 | unsigned long pnum_begin, | |
2239 | unsigned long pnum_end, | |
2240 | unsigned long map_count, | |
2241 | int nodeid); | |
2242 | ||
98f3cfc1 | 2243 | struct page *sparse_mem_map_populate(unsigned long pnum, int nid); |
29c71111 AW |
2244 | pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
2245 | pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node); | |
2246 | pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); | |
2247 | pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node); | |
8f6aac41 | 2248 | void *vmemmap_alloc_block(unsigned long size, int node); |
9bdac914 | 2249 | void *vmemmap_alloc_block_buf(unsigned long size, int node); |
8f6aac41 | 2250 | void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
0aad818b JW |
2251 | int vmemmap_populate_basepages(unsigned long start, unsigned long end, |
2252 | int node); | |
2253 | int vmemmap_populate(unsigned long start, unsigned long end, int node); | |
c2b91e2e | 2254 | void vmemmap_populate_print_last(void); |
0197518c | 2255 | #ifdef CONFIG_MEMORY_HOTPLUG |
0aad818b | 2256 | void vmemmap_free(unsigned long start, unsigned long end); |
0197518c | 2257 | #endif |
46723bfa YI |
2258 | void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, |
2259 | unsigned long size); | |
6a46079c | 2260 | |
82ba011b AK |
2261 | enum mf_flags { |
2262 | MF_COUNT_INCREASED = 1 << 0, | |
7329bbeb | 2263 | MF_ACTION_REQUIRED = 1 << 1, |
6751ed65 | 2264 | MF_MUST_KILL = 1 << 2, |
cf870c70 | 2265 | MF_SOFT_OFFLINE = 1 << 3, |
82ba011b | 2266 | }; |
cd42f4a3 | 2267 | extern int memory_failure(unsigned long pfn, int trapno, int flags); |
ea8f5fb8 | 2268 | extern void memory_failure_queue(unsigned long pfn, int trapno, int flags); |
847ce401 | 2269 | extern int unpoison_memory(unsigned long pfn); |
ead07f6a | 2270 | extern int get_hwpoison_page(struct page *page); |
94bf4ec8 | 2271 | extern void put_hwpoison_page(struct page *page); |
6a46079c AK |
2272 | extern int sysctl_memory_failure_early_kill; |
2273 | extern int sysctl_memory_failure_recovery; | |
facb6011 | 2274 | extern void shake_page(struct page *p, int access); |
293c07e3 | 2275 | extern atomic_long_t num_poisoned_pages; |
facb6011 | 2276 | extern int soft_offline_page(struct page *page, int flags); |
6a46079c | 2277 | |
cc637b17 XX |
2278 | |
2279 | /* | |
2280 | * Error handlers for various types of pages. | |
2281 | */ | |
cc3e2af4 | 2282 | enum mf_result { |
cc637b17 XX |
2283 | MF_IGNORED, /* Error: cannot be handled */ |
2284 | MF_FAILED, /* Error: handling failed */ | |
2285 | MF_DELAYED, /* Will be handled later */ | |
2286 | MF_RECOVERED, /* Successfully recovered */ | |
2287 | }; | |
2288 | ||
2289 | enum mf_action_page_type { | |
2290 | MF_MSG_KERNEL, | |
2291 | MF_MSG_KERNEL_HIGH_ORDER, | |
2292 | MF_MSG_SLAB, | |
2293 | MF_MSG_DIFFERENT_COMPOUND, | |
2294 | MF_MSG_POISONED_HUGE, | |
2295 | MF_MSG_HUGE, | |
2296 | MF_MSG_FREE_HUGE, | |
2297 | MF_MSG_UNMAP_FAILED, | |
2298 | MF_MSG_DIRTY_SWAPCACHE, | |
2299 | MF_MSG_CLEAN_SWAPCACHE, | |
2300 | MF_MSG_DIRTY_MLOCKED_LRU, | |
2301 | MF_MSG_CLEAN_MLOCKED_LRU, | |
2302 | MF_MSG_DIRTY_UNEVICTABLE_LRU, | |
2303 | MF_MSG_CLEAN_UNEVICTABLE_LRU, | |
2304 | MF_MSG_DIRTY_LRU, | |
2305 | MF_MSG_CLEAN_LRU, | |
2306 | MF_MSG_TRUNCATED_LRU, | |
2307 | MF_MSG_BUDDY, | |
2308 | MF_MSG_BUDDY_2ND, | |
2309 | MF_MSG_UNKNOWN, | |
2310 | }; | |
2311 | ||
47ad8475 AA |
2312 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) |
2313 | extern void clear_huge_page(struct page *page, | |
2314 | unsigned long addr, | |
2315 | unsigned int pages_per_huge_page); | |
2316 | extern void copy_user_huge_page(struct page *dst, struct page *src, | |
2317 | unsigned long addr, struct vm_area_struct *vma, | |
2318 | unsigned int pages_per_huge_page); | |
2319 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ | |
2320 | ||
e30825f1 JK |
2321 | extern struct page_ext_operations debug_guardpage_ops; |
2322 | extern struct page_ext_operations page_poisoning_ops; | |
2323 | ||
c0a32fc5 SG |
2324 | #ifdef CONFIG_DEBUG_PAGEALLOC |
2325 | extern unsigned int _debug_guardpage_minorder; | |
e30825f1 | 2326 | extern bool _debug_guardpage_enabled; |
c0a32fc5 SG |
2327 | |
2328 | static inline unsigned int debug_guardpage_minorder(void) | |
2329 | { | |
2330 | return _debug_guardpage_minorder; | |
2331 | } | |
2332 | ||
e30825f1 JK |
2333 | static inline bool debug_guardpage_enabled(void) |
2334 | { | |
2335 | return _debug_guardpage_enabled; | |
2336 | } | |
2337 | ||
c0a32fc5 SG |
2338 | static inline bool page_is_guard(struct page *page) |
2339 | { | |
e30825f1 JK |
2340 | struct page_ext *page_ext; |
2341 | ||
2342 | if (!debug_guardpage_enabled()) | |
2343 | return false; | |
2344 | ||
2345 | page_ext = lookup_page_ext(page); | |
2346 | return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags); | |
c0a32fc5 SG |
2347 | } |
2348 | #else | |
2349 | static inline unsigned int debug_guardpage_minorder(void) { return 0; } | |
e30825f1 | 2350 | static inline bool debug_guardpage_enabled(void) { return false; } |
c0a32fc5 SG |
2351 | static inline bool page_is_guard(struct page *page) { return false; } |
2352 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
2353 | ||
f9872caf CS |
2354 | #if MAX_NUMNODES > 1 |
2355 | void __init setup_nr_node_ids(void); | |
2356 | #else | |
2357 | static inline void setup_nr_node_ids(void) {} | |
2358 | #endif | |
2359 | ||
1da177e4 LT |
2360 | #endif /* __KERNEL__ */ |
2361 | #endif /* _LINUX_MM_H */ |