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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_MM_H
2#define _LINUX_MM_H
3
4#include <linux/sched.h>
5#include <linux/errno.h>
6
7#ifdef __KERNEL__
8
9#include <linux/config.h>
10#include <linux/gfp.h>
11#include <linux/list.h>
12#include <linux/mmzone.h>
13#include <linux/rbtree.h>
14#include <linux/prio_tree.h>
15#include <linux/fs.h>
16
17struct mempolicy;
18struct anon_vma;
19
20#ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */
21extern unsigned long max_mapnr;
22#endif
23
24extern unsigned long num_physpages;
25extern void * high_memory;
26extern unsigned long vmalloc_earlyreserve;
27extern int page_cluster;
28
29#ifdef CONFIG_SYSCTL
30extern int sysctl_legacy_va_layout;
31#else
32#define sysctl_legacy_va_layout 0
33#endif
34
35#include <asm/page.h>
36#include <asm/pgtable.h>
37#include <asm/processor.h>
38#include <asm/atomic.h>
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
41
42/*
43 * Linux kernel virtual memory manager primitives.
44 * The idea being to have a "virtual" mm in the same way
45 * we have a virtual fs - giving a cleaner interface to the
46 * mm details, and allowing different kinds of memory mappings
47 * (from shared memory to executable loading to arbitrary
48 * mmap() functions).
49 */
50
51/*
52 * This struct defines a memory VMM memory area. There is one of these
53 * per VM-area/task. A VM area is any part of the process virtual memory
54 * space that has a special rule for the page-fault handlers (ie a shared
55 * library, the executable area etc).
56 */
57struct vm_area_struct {
58 struct mm_struct * vm_mm; /* The address space we belong to. */
59 unsigned long vm_start; /* Our start address within vm_mm. */
60 unsigned long vm_end; /* The first byte after our end address
61 within vm_mm. */
62
63 /* linked list of VM areas per task, sorted by address */
64 struct vm_area_struct *vm_next;
65
66 pgprot_t vm_page_prot; /* Access permissions of this VMA. */
67 unsigned long vm_flags; /* Flags, listed below. */
68
69 struct rb_node vm_rb;
70
71 /*
72 * For areas with an address space and backing store,
73 * linkage into the address_space->i_mmap prio tree, or
74 * linkage to the list of like vmas hanging off its node, or
75 * linkage of vma in the address_space->i_mmap_nonlinear list.
76 */
77 union {
78 struct {
79 struct list_head list;
80 void *parent; /* aligns with prio_tree_node parent */
81 struct vm_area_struct *head;
82 } vm_set;
83
84 struct raw_prio_tree_node prio_tree_node;
85 } shared;
86
87 /*
88 * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma
89 * list, after a COW of one of the file pages. A MAP_SHARED vma
90 * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack
91 * or brk vma (with NULL file) can only be in an anon_vma list.
92 */
93 struct list_head anon_vma_node; /* Serialized by anon_vma->lock */
94 struct anon_vma *anon_vma; /* Serialized by page_table_lock */
95
96 /* Function pointers to deal with this struct. */
97 struct vm_operations_struct * vm_ops;
98
99 /* Information about our backing store: */
100 unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE
101 units, *not* PAGE_CACHE_SIZE */
102 struct file * vm_file; /* File we map to (can be NULL). */
103 void * vm_private_data; /* was vm_pte (shared mem) */
104 unsigned long vm_truncate_count;/* truncate_count or restart_addr */
105
106#ifndef CONFIG_MMU
107 atomic_t vm_usage; /* refcount (VMAs shared if !MMU) */
108#endif
109#ifdef CONFIG_NUMA
110 struct mempolicy *vm_policy; /* NUMA policy for the VMA */
111#endif
112};
113
114/*
115 * This struct defines the per-mm list of VMAs for uClinux. If CONFIG_MMU is
116 * disabled, then there's a single shared list of VMAs maintained by the
117 * system, and mm's subscribe to these individually
118 */
119struct vm_list_struct {
120 struct vm_list_struct *next;
121 struct vm_area_struct *vma;
122};
123
124#ifndef CONFIG_MMU
125extern struct rb_root nommu_vma_tree;
126extern struct rw_semaphore nommu_vma_sem;
127
128extern unsigned int kobjsize(const void *objp);
129#endif
130
131/*
132 * vm_flags..
133 */
134#define VM_READ 0x00000001 /* currently active flags */
135#define VM_WRITE 0x00000002
136#define VM_EXEC 0x00000004
137#define VM_SHARED 0x00000008
138
Paolo 'Blaisorblade' Giarrusso7e2cff42005-09-21 09:55:39 -0700139/* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140#define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
141#define VM_MAYWRITE 0x00000020
142#define VM_MAYEXEC 0x00000040
143#define VM_MAYSHARE 0x00000080
144
145#define VM_GROWSDOWN 0x00000100 /* general info on the segment */
146#define VM_GROWSUP 0x00000200
Hugh Dickins0b14c172005-11-21 21:32:15 -0800147#define VM_SHM 0x00000000 /* Means nothing: delete it later */
Linus Torvalds6aab3412005-11-28 14:34:23 -0800148#define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149#define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
150
151#define VM_EXECUTABLE 0x00001000
152#define VM_LOCKED 0x00002000
153#define VM_IO 0x00004000 /* Memory mapped I/O or similar */
154
155 /* Used by sys_madvise() */
156#define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
157#define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
158
159#define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
160#define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
Hugh Dickins0b14c172005-11-21 21:32:15 -0800161#define VM_RESERVED 0x00080000 /* Count as reserved_vm like IO */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162#define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
163#define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
164#define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
165#define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */
166
167#ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
168#define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
169#endif
170
171#ifdef CONFIG_STACK_GROWSUP
172#define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
173#else
174#define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
175#endif
176
177#define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ)
178#define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK
179#define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK))
180#define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ)
181#define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ)
182
183/*
184 * mapping from the currently active vm_flags protection bits (the
185 * low four bits) to a page protection mask..
186 */
187extern pgprot_t protection_map[16];
188
189
190/*
191 * These are the virtual MM functions - opening of an area, closing and
192 * unmapping it (needed to keep files on disk up-to-date etc), pointer
193 * to the functions called when a no-page or a wp-page exception occurs.
194 */
195struct vm_operations_struct {
196 void (*open)(struct vm_area_struct * area);
197 void (*close)(struct vm_area_struct * area);
198 struct page * (*nopage)(struct vm_area_struct * area, unsigned long address, int *type);
199 int (*populate)(struct vm_area_struct * area, unsigned long address, unsigned long len, pgprot_t prot, unsigned long pgoff, int nonblock);
200#ifdef CONFIG_NUMA
201 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
202 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
203 unsigned long addr);
204#endif
205};
206
207struct mmu_gather;
208struct inode;
209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210/*
211 * Each physical page in the system has a struct page associated with
212 * it to keep track of whatever it is we are using the page for at the
213 * moment. Note that we have no way to track which tasks are using
214 * a page.
215 */
216struct page {
Andi Kleen07808b72005-11-05 17:25:53 +0100217 unsigned long flags; /* Atomic flags, some possibly
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 * updated asynchronously */
219 atomic_t _count; /* Usage count, see below. */
220 atomic_t _mapcount; /* Count of ptes mapped in mms,
221 * to show when page is mapped
222 * & limit reverse map searches.
223 */
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700224 union {
225 unsigned long private; /* Mapping-private opaque data:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 * usually used for buffer_heads
227 * if PagePrivate set; used for
228 * swp_entry_t if PageSwapCache
229 * When page is free, this indicates
230 * order in the buddy system.
231 */
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700232#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
233 spinlock_t ptl;
234#endif
235 } u;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 struct address_space *mapping; /* If low bit clear, points to
237 * inode address_space, or NULL.
238 * If page mapped as anonymous
239 * memory, low bit is set, and
240 * it points to anon_vma object:
241 * see PAGE_MAPPING_ANON below.
242 */
243 pgoff_t index; /* Our offset within mapping. */
244 struct list_head lru; /* Pageout list, eg. active_list
245 * protected by zone->lru_lock !
246 */
247 /*
248 * On machines where all RAM is mapped into kernel address space,
249 * we can simply calculate the virtual address. On machines with
250 * highmem some memory is mapped into kernel virtual memory
251 * dynamically, so we need a place to store that address.
252 * Note that this field could be 16 bits on x86 ... ;)
253 *
254 * Architectures with slow multiplication can define
255 * WANT_PAGE_VIRTUAL in asm/page.h
256 */
257#if defined(WANT_PAGE_VIRTUAL)
258 void *virtual; /* Kernel virtual address (NULL if
259 not kmapped, ie. highmem) */
260#endif /* WANT_PAGE_VIRTUAL */
261};
262
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700263#define page_private(page) ((page)->u.private)
264#define set_page_private(page, v) ((page)->u.private = (v))
265
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266/*
267 * FIXME: take this include out, include page-flags.h in
268 * files which need it (119 of them)
269 */
270#include <linux/page-flags.h>
271
272/*
273 * Methods to modify the page usage count.
274 *
275 * What counts for a page usage:
276 * - cache mapping (page->mapping)
277 * - private data (page->private)
278 * - page mapped in a task's page tables, each mapping
279 * is counted separately
280 *
281 * Also, many kernel routines increase the page count before a critical
282 * routine so they can be sure the page doesn't go away from under them.
283 *
284 * Since 2.6.6 (approx), a free page has ->_count = -1. This is so that we
285 * can use atomic_add_negative(-1, page->_count) to detect when the page
286 * becomes free and so that we can also use atomic_inc_and_test to atomically
287 * detect when we just tried to grab a ref on a page which some other CPU has
288 * already deemed to be freeable.
289 *
290 * NO code should make assumptions about this internal detail! Use the provided
291 * macros which retain the old rules: page_count(page) == 0 is a free page.
292 */
293
294/*
295 * Drop a ref, return true if the logical refcount fell to zero (the page has
296 * no users)
297 */
298#define put_page_testzero(p) \
299 ({ \
300 BUG_ON(page_count(p) == 0); \
301 atomic_add_negative(-1, &(p)->_count); \
302 })
303
304/*
305 * Grab a ref, return true if the page previously had a logical refcount of
306 * zero. ie: returns true if we just grabbed an already-deemed-to-be-free page
307 */
308#define get_page_testone(p) atomic_inc_and_test(&(p)->_count)
309
310#define set_page_count(p,v) atomic_set(&(p)->_count, v - 1)
311#define __put_page(p) atomic_dec(&(p)->_count)
312
313extern void FASTCALL(__page_cache_release(struct page *));
314
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700315static inline int page_count(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316{
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700317 if (PageCompound(page))
318 page = (struct page *)page_private(page);
319 return atomic_read(&page->_count) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320}
321
322static inline void get_page(struct page *page)
323{
324 if (unlikely(PageCompound(page)))
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700325 page = (struct page *)page_private(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 atomic_inc(&page->_count);
327}
328
329void put_page(struct page *page);
330
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331/*
332 * Multiple processes may "see" the same page. E.g. for untouched
333 * mappings of /dev/null, all processes see the same page full of
334 * zeroes, and text pages of executables and shared libraries have
335 * only one copy in memory, at most, normally.
336 *
337 * For the non-reserved pages, page_count(page) denotes a reference count.
Paolo 'Blaisorblade' Giarrusso7e871b62005-09-21 09:55:38 -0700338 * page_count() == 0 means the page is free. page->lru is then used for
339 * freelist management in the buddy allocator.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 * page_count() == 1 means the page is used for exactly one purpose
341 * (e.g. a private data page of one process).
342 *
343 * A page may be used for kmalloc() or anyone else who does a
344 * __get_free_page(). In this case the page_count() is at least 1, and
345 * all other fields are unused but should be 0 or NULL. The
346 * management of this page is the responsibility of the one who uses
347 * it.
348 *
349 * The other pages (we may call them "process pages") are completely
350 * managed by the Linux memory manager: I/O, buffers, swapping etc.
351 * The following discussion applies only to them.
352 *
353 * A page may belong to an inode's memory mapping. In this case,
354 * page->mapping is the pointer to the inode, and page->index is the
355 * file offset of the page, in units of PAGE_CACHE_SIZE.
356 *
357 * A page contains an opaque `private' member, which belongs to the
358 * page's address_space. Usually, this is the address of a circular
359 * list of the page's disk buffers.
360 *
361 * For pages belonging to inodes, the page_count() is the number of
362 * attaches, plus 1 if `private' contains something, plus one for
363 * the page cache itself.
364 *
Paolo 'Blaisorblade' Giarrusso7e871b62005-09-21 09:55:38 -0700365 * Instead of keeping dirty/clean pages in per address-space lists, we instead
366 * now tag pages as dirty/under writeback in the radix tree.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 *
368 * There is also a per-mapping radix tree mapping index to the page
369 * in memory if present. The tree is rooted at mapping->root.
370 *
371 * All process pages can do I/O:
372 * - inode pages may need to be read from disk,
373 * - inode pages which have been modified and are MAP_SHARED may need
374 * to be written to disk,
375 * - private pages which have been modified may need to be swapped out
376 * to swap space and (later) to be read back into memory.
377 */
378
379/*
380 * The zone field is never updated after free_area_init_core()
381 * sets it, so none of the operations on it need to be atomic.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 */
Dave Hansen348f8b62005-06-23 00:07:40 -0700383
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700384
385/*
386 * page->flags layout:
387 *
388 * There are three possibilities for how page->flags get
389 * laid out. The first is for the normal case, without
390 * sparsemem. The second is for sparsemem when there is
391 * plenty of space for node and section. The last is when
392 * we have run out of space and have to fall back to an
393 * alternate (slower) way of determining the node.
394 *
395 * No sparsemem: | NODE | ZONE | ... | FLAGS |
396 * with space for node: | SECTION | NODE | ZONE | ... | FLAGS |
397 * no space for node: | SECTION | ZONE | ... | FLAGS |
398 */
399#ifdef CONFIG_SPARSEMEM
400#define SECTIONS_WIDTH SECTIONS_SHIFT
401#else
402#define SECTIONS_WIDTH 0
403#endif
404
405#define ZONES_WIDTH ZONES_SHIFT
406
407#if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= FLAGS_RESERVED
408#define NODES_WIDTH NODES_SHIFT
409#else
410#define NODES_WIDTH 0
411#endif
412
413/* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */
Andi Kleen07808b72005-11-05 17:25:53 +0100414#define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700415#define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
416#define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
417
418/*
419 * We are going to use the flags for the page to node mapping if its in
420 * there. This includes the case where there is no node, so it is implicit.
421 */
422#define FLAGS_HAS_NODE (NODES_WIDTH > 0 || NODES_SHIFT == 0)
423
424#ifndef PFN_SECTION_SHIFT
425#define PFN_SECTION_SHIFT 0
426#endif
Dave Hansen348f8b62005-06-23 00:07:40 -0700427
428/*
429 * Define the bit shifts to access each section. For non-existant
430 * sections we define the shift as 0; that plus a 0 mask ensures
431 * the compiler will optimise away reference to them.
432 */
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700433#define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
434#define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
435#define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
Dave Hansen348f8b62005-06-23 00:07:40 -0700436
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700437/* NODE:ZONE or SECTION:ZONE is used to lookup the zone from a page. */
438#if FLAGS_HAS_NODE
Dave Hansen348f8b62005-06-23 00:07:40 -0700439#define ZONETABLE_SHIFT (NODES_SHIFT + ZONES_SHIFT)
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700440#else
441#define ZONETABLE_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
442#endif
Dave Hansen348f8b62005-06-23 00:07:40 -0700443#define ZONETABLE_PGSHIFT ZONES_PGSHIFT
444
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700445#if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > FLAGS_RESERVED
446#error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > FLAGS_RESERVED
Dave Hansen348f8b62005-06-23 00:07:40 -0700447#endif
448
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700449#define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
450#define NODES_MASK ((1UL << NODES_WIDTH) - 1)
451#define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
Dave Hansen348f8b62005-06-23 00:07:40 -0700452#define ZONETABLE_MASK ((1UL << ZONETABLE_SHIFT) - 1)
453
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454static inline unsigned long page_zonenum(struct page *page)
455{
Dave Hansen348f8b62005-06-23 00:07:40 -0700456 return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458
459struct zone;
460extern struct zone *zone_table[];
461
462static inline struct zone *page_zone(struct page *page)
463{
Dave Hansen348f8b62005-06-23 00:07:40 -0700464 return zone_table[(page->flags >> ZONETABLE_PGSHIFT) &
465 ZONETABLE_MASK];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466}
467
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700468static inline unsigned long page_to_nid(struct page *page)
469{
470 if (FLAGS_HAS_NODE)
471 return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
472 else
473 return page_zone(page)->zone_pgdat->node_id;
474}
475static inline unsigned long page_to_section(struct page *page)
476{
477 return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
478}
479
Dave Hansen348f8b62005-06-23 00:07:40 -0700480static inline void set_page_zone(struct page *page, unsigned long zone)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481{
Dave Hansen348f8b62005-06-23 00:07:40 -0700482 page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
483 page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
484}
485static inline void set_page_node(struct page *page, unsigned long node)
486{
487 page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
488 page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
489}
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700490static inline void set_page_section(struct page *page, unsigned long section)
491{
492 page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
493 page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
494}
Dave Hansen348f8b62005-06-23 00:07:40 -0700495
496static inline void set_page_links(struct page *page, unsigned long zone,
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700497 unsigned long node, unsigned long pfn)
Dave Hansen348f8b62005-06-23 00:07:40 -0700498{
499 set_page_zone(page, zone);
500 set_page_node(page, node);
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700501 set_page_section(page, pfn_to_section_nr(pfn));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502}
503
504#ifndef CONFIG_DISCONTIGMEM
505/* The array of struct pages - for discontigmem use pgdat->lmem_map */
506extern struct page *mem_map;
507#endif
508
509static inline void *lowmem_page_address(struct page *page)
510{
511 return __va(page_to_pfn(page) << PAGE_SHIFT);
512}
513
514#if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
515#define HASHED_PAGE_VIRTUAL
516#endif
517
518#if defined(WANT_PAGE_VIRTUAL)
519#define page_address(page) ((page)->virtual)
520#define set_page_address(page, address) \
521 do { \
522 (page)->virtual = (address); \
523 } while(0)
524#define page_address_init() do { } while(0)
525#endif
526
527#if defined(HASHED_PAGE_VIRTUAL)
528void *page_address(struct page *page);
529void set_page_address(struct page *page, void *virtual);
530void page_address_init(void);
531#endif
532
533#if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
534#define page_address(page) lowmem_page_address(page)
535#define set_page_address(page, address) do { } while(0)
536#define page_address_init() do { } while(0)
537#endif
538
539/*
540 * On an anonymous page mapped into a user virtual memory area,
541 * page->mapping points to its anon_vma, not to a struct address_space;
542 * with the PAGE_MAPPING_ANON bit set to distinguish it.
543 *
544 * Please note that, confusingly, "page_mapping" refers to the inode
545 * address_space which maps the page from disk; whereas "page_mapped"
546 * refers to user virtual address space into which the page is mapped.
547 */
548#define PAGE_MAPPING_ANON 1
549
550extern struct address_space swapper_space;
551static inline struct address_space *page_mapping(struct page *page)
552{
553 struct address_space *mapping = page->mapping;
554
555 if (unlikely(PageSwapCache(page)))
556 mapping = &swapper_space;
557 else if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON))
558 mapping = NULL;
559 return mapping;
560}
561
562static inline int PageAnon(struct page *page)
563{
564 return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0;
565}
566
567/*
568 * Return the pagecache index of the passed page. Regular pagecache pages
569 * use ->index whereas swapcache pages use ->private
570 */
571static inline pgoff_t page_index(struct page *page)
572{
573 if (unlikely(PageSwapCache(page)))
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700574 return page_private(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 return page->index;
576}
577
578/*
579 * The atomic page->_mapcount, like _count, starts from -1:
580 * so that transitions both from it and to it can be tracked,
581 * using atomic_inc_and_test and atomic_add_negative(-1).
582 */
583static inline void reset_page_mapcount(struct page *page)
584{
585 atomic_set(&(page)->_mapcount, -1);
586}
587
588static inline int page_mapcount(struct page *page)
589{
590 return atomic_read(&(page)->_mapcount) + 1;
591}
592
593/*
594 * Return true if this page is mapped into pagetables.
595 */
596static inline int page_mapped(struct page *page)
597{
598 return atomic_read(&(page)->_mapcount) >= 0;
599}
600
601/*
602 * Error return values for the *_nopage functions
603 */
604#define NOPAGE_SIGBUS (NULL)
605#define NOPAGE_OOM ((struct page *) (-1))
606
607/*
608 * Different kinds of faults, as returned by handle_mm_fault().
609 * Used to decide whether a process gets delivered SIGBUS or
610 * just gets major/minor fault counters bumped up.
611 */
Nick Pigginf33ea7f2005-08-03 20:24:01 +1000612#define VM_FAULT_OOM 0x00
613#define VM_FAULT_SIGBUS 0x01
614#define VM_FAULT_MINOR 0x02
615#define VM_FAULT_MAJOR 0x03
616
617/*
618 * Special case for get_user_pages.
619 * Must be in a distinct bit from the above VM_FAULT_ flags.
620 */
621#define VM_FAULT_WRITE 0x10
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622
623#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
624
625extern void show_free_areas(void);
626
627#ifdef CONFIG_SHMEM
628struct page *shmem_nopage(struct vm_area_struct *vma,
629 unsigned long address, int *type);
630int shmem_set_policy(struct vm_area_struct *vma, struct mempolicy *new);
631struct mempolicy *shmem_get_policy(struct vm_area_struct *vma,
632 unsigned long addr);
633int shmem_lock(struct file *file, int lock, struct user_struct *user);
634#else
635#define shmem_nopage filemap_nopage
636#define shmem_lock(a, b, c) ({0;}) /* always in memory, no need to lock */
637#define shmem_set_policy(a, b) (0)
638#define shmem_get_policy(a, b) (NULL)
639#endif
640struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags);
641
642int shmem_zero_setup(struct vm_area_struct *);
643
644static inline int can_do_mlock(void)
645{
646 if (capable(CAP_IPC_LOCK))
647 return 1;
648 if (current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur != 0)
649 return 1;
650 return 0;
651}
652extern int user_shm_lock(size_t, struct user_struct *);
653extern void user_shm_unlock(size_t, struct user_struct *);
654
655/*
656 * Parameter block passed down to zap_pte_range in exceptional cases.
657 */
658struct zap_details {
659 struct vm_area_struct *nonlinear_vma; /* Check page->index if set */
660 struct address_space *check_mapping; /* Check page->mapping if set */
661 pgoff_t first_index; /* Lowest page->index to unmap */
662 pgoff_t last_index; /* Highest page->index to unmap */
663 spinlock_t *i_mmap_lock; /* For unmap_mapping_range: */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 unsigned long truncate_count; /* Compare vm_truncate_count */
665};
666
Linus Torvalds6aab3412005-11-28 14:34:23 -0800667struct page *vm_normal_page(struct vm_area_struct *, unsigned long, pte_t);
Hugh Dickinsee39b372005-04-19 13:29:15 -0700668unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 unsigned long size, struct zap_details *);
Hugh Dickins508034a2005-10-29 18:16:30 -0700670unsigned long unmap_vmas(struct mmu_gather **tlb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 struct vm_area_struct *start_vma, unsigned long start_addr,
672 unsigned long end_addr, unsigned long *nr_accounted,
673 struct zap_details *);
Hugh Dickins3bf5ee92005-04-19 13:29:16 -0700674void free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
675 unsigned long end, unsigned long floor, unsigned long ceiling);
676void free_pgtables(struct mmu_gather **tlb, struct vm_area_struct *start_vma,
Hugh Dickinse0da3822005-04-19 13:29:15 -0700677 unsigned long floor, unsigned long ceiling);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
679 struct vm_area_struct *vma);
680int zeromap_page_range(struct vm_area_struct *vma, unsigned long from,
681 unsigned long size, pgprot_t prot);
682void unmap_mapping_range(struct address_space *mapping,
683 loff_t const holebegin, loff_t const holelen, int even_cows);
684
685static inline void unmap_shared_mapping_range(struct address_space *mapping,
686 loff_t const holebegin, loff_t const holelen)
687{
688 unmap_mapping_range(mapping, holebegin, holelen, 0);
689}
690
691extern int vmtruncate(struct inode * inode, loff_t offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692extern int install_page(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, struct page *page, pgprot_t prot);
693extern int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, unsigned long pgoff, pgprot_t prot);
Nick Pigginf33ea7f2005-08-03 20:24:01 +1000694extern int __handle_mm_fault(struct mm_struct *mm,struct vm_area_struct *vma, unsigned long address, int write_access);
695
696static inline int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, int write_access)
697{
698 return __handle_mm_fault(mm, vma, address, write_access) & (~VM_FAULT_WRITE);
699}
700
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701extern int make_pages_present(unsigned long addr, unsigned long end);
702extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
703void install_arg_page(struct vm_area_struct *, struct page *, unsigned long);
704
705int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start,
706 int len, int write, int force, struct page **pages, struct vm_area_struct **vmas);
Nick Pigginb5810032005-10-29 18:16:12 -0700707void print_bad_pte(struct vm_area_struct *, pte_t, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
709int __set_page_dirty_buffers(struct page *page);
710int __set_page_dirty_nobuffers(struct page *page);
711int redirty_page_for_writepage(struct writeback_control *wbc,
712 struct page *page);
713int FASTCALL(set_page_dirty(struct page *page));
714int set_page_dirty_lock(struct page *page);
715int clear_page_dirty_for_io(struct page *page);
716
717extern unsigned long do_mremap(unsigned long addr,
718 unsigned long old_len, unsigned long new_len,
719 unsigned long flags, unsigned long new_addr);
720
721/*
722 * Prototype to add a shrinker callback for ageable caches.
723 *
724 * These functions are passed a count `nr_to_scan' and a gfpmask. They should
725 * scan `nr_to_scan' objects, attempting to free them.
726 *
Domen Puncer845d3432005-05-05 16:16:14 -0700727 * The callback must return the number of objects which remain in the cache.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 *
Domen Puncer845d3432005-05-05 16:16:14 -0700729 * The callback will be passed nr_to_scan == 0 when the VM is querying the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 * cache size, so a fastpath for that case is appropriate.
731 */
Al Viro6daa0e22005-10-21 03:18:50 -0400732typedef int (*shrinker_t)(int nr_to_scan, gfp_t gfp_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
734/*
735 * Add an aging callback. The int is the number of 'seeks' it takes
736 * to recreate one of the objects that these functions age.
737 */
738
739#define DEFAULT_SEEKS 2
740struct shrinker;
741extern struct shrinker *set_shrinker(int, shrinker_t);
742extern void remove_shrinker(struct shrinker *shrinker);
743
Linus Torvaldsc9cfcdd2005-11-29 14:03:14 -0800744extern pte_t *FASTCALL(get_locked_pte(struct mm_struct *mm, unsigned long addr, spinlock_t **ptl));
745
Hugh Dickins1bb36302005-10-29 18:16:22 -0700746int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
747int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
748int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address);
749int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
750
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751/*
752 * The following ifdef needed to get the 4level-fixup.h header to work.
753 * Remove it when 4level-fixup.h has been removed.
754 */
Hugh Dickins1bb36302005-10-29 18:16:22 -0700755#if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
757{
Hugh Dickins1bb36302005-10-29 18:16:22 -0700758 return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
759 NULL: pud_offset(pgd, address);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760}
761
762static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
763{
Hugh Dickins1bb36302005-10-29 18:16:22 -0700764 return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
765 NULL: pmd_offset(pud, address);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766}
Hugh Dickins1bb36302005-10-29 18:16:22 -0700767#endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
768
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700769#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
770/*
771 * We tuck a spinlock to guard each pagetable page into its struct page,
772 * at page->private, with BUILD_BUG_ON to make sure that this will not
773 * overflow into the next struct page (as it might with DEBUG_SPINLOCK).
774 * When freeing, reset page->mapping so free_pages_check won't complain.
775 */
776#define __pte_lockptr(page) &((page)->u.ptl)
777#define pte_lock_init(_page) do { \
778 spin_lock_init(__pte_lockptr(_page)); \
779} while (0)
780#define pte_lock_deinit(page) ((page)->mapping = NULL)
781#define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));})
782#else
783/*
784 * We use mm->page_table_lock to guard all pagetable pages of the mm.
785 */
786#define pte_lock_init(page) do {} while (0)
787#define pte_lock_deinit(page) do {} while (0)
788#define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;})
789#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
790
Hugh Dickinsc74df322005-10-29 18:16:23 -0700791#define pte_offset_map_lock(mm, pmd, address, ptlp) \
792({ \
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700793 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
Hugh Dickinsc74df322005-10-29 18:16:23 -0700794 pte_t *__pte = pte_offset_map(pmd, address); \
795 *(ptlp) = __ptl; \
796 spin_lock(__ptl); \
797 __pte; \
798})
799
800#define pte_unmap_unlock(pte, ptl) do { \
801 spin_unlock(ptl); \
802 pte_unmap(pte); \
803} while (0)
804
Hugh Dickins1bb36302005-10-29 18:16:22 -0700805#define pte_alloc_map(mm, pmd, address) \
806 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \
807 NULL: pte_offset_map(pmd, address))
808
Hugh Dickinsc74df322005-10-29 18:16:23 -0700809#define pte_alloc_map_lock(mm, pmd, address, ptlp) \
810 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \
811 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
812
Hugh Dickins1bb36302005-10-29 18:16:22 -0700813#define pte_alloc_kernel(pmd, address) \
814 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
815 NULL: pte_offset_kernel(pmd, address))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816
817extern void free_area_init(unsigned long * zones_size);
818extern void free_area_init_node(int nid, pg_data_t *pgdat,
819 unsigned long * zones_size, unsigned long zone_start_pfn,
820 unsigned long *zholes_size);
821extern void memmap_init_zone(unsigned long, int, unsigned long, unsigned long);
Dave Hansen3947be12005-10-29 18:16:54 -0700822extern void setup_per_zone_pages_min(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823extern void mem_init(void);
824extern void show_mem(void);
825extern void si_meminfo(struct sysinfo * val);
826extern void si_meminfo_node(struct sysinfo *val, int nid);
827
Christoph Lametere7c8d5c2005-06-21 17:14:47 -0700828#ifdef CONFIG_NUMA
829extern void setup_per_cpu_pageset(void);
830#else
831static inline void setup_per_cpu_pageset(void) {}
832#endif
833
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834/* prio_tree.c */
835void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old);
836void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *);
837void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *);
838struct vm_area_struct *vma_prio_tree_next(struct vm_area_struct *vma,
839 struct prio_tree_iter *iter);
840
841#define vma_prio_tree_foreach(vma, iter, root, begin, end) \
842 for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \
843 (vma = vma_prio_tree_next(vma, iter)); )
844
845static inline void vma_nonlinear_insert(struct vm_area_struct *vma,
846 struct list_head *list)
847{
848 vma->shared.vm_set.parent = NULL;
849 list_add_tail(&vma->shared.vm_set.list, list);
850}
851
852/* mmap.c */
853extern int __vm_enough_memory(long pages, int cap_sys_admin);
854extern void vma_adjust(struct vm_area_struct *vma, unsigned long start,
855 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
856extern struct vm_area_struct *vma_merge(struct mm_struct *,
857 struct vm_area_struct *prev, unsigned long addr, unsigned long end,
858 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
859 struct mempolicy *);
860extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
861extern int split_vma(struct mm_struct *,
862 struct vm_area_struct *, unsigned long addr, int new_below);
863extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
864extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
865 struct rb_node **, struct rb_node *);
Hugh Dickinsa8fb5612005-10-29 18:15:57 -0700866extern void unlink_file_vma(struct vm_area_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
868 unsigned long addr, unsigned long len, pgoff_t pgoff);
869extern void exit_mmap(struct mm_struct *);
akpm@osdl.org119f6572005-05-01 08:58:35 -0700870extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
872extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
873
874extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
875 unsigned long len, unsigned long prot,
876 unsigned long flag, unsigned long pgoff);
877
878static inline unsigned long do_mmap(struct file *file, unsigned long addr,
879 unsigned long len, unsigned long prot,
880 unsigned long flag, unsigned long offset)
881{
882 unsigned long ret = -EINVAL;
883 if ((offset + PAGE_ALIGN(len)) < offset)
884 goto out;
885 if (!(offset & ~PAGE_MASK))
886 ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT);
887out:
888 return ret;
889}
890
891extern int do_munmap(struct mm_struct *, unsigned long, size_t);
892
893extern unsigned long do_brk(unsigned long, unsigned long);
894
895/* filemap.c */
896extern unsigned long page_unuse(struct page *);
897extern void truncate_inode_pages(struct address_space *, loff_t);
898
899/* generic vm_area_ops exported for stackable file systems */
900extern struct page *filemap_nopage(struct vm_area_struct *, unsigned long, int *);
901extern int filemap_populate(struct vm_area_struct *, unsigned long,
902 unsigned long, pgprot_t, unsigned long, int);
903
904/* mm/page-writeback.c */
905int write_one_page(struct page *page, int wait);
906
907/* readahead.c */
908#define VM_MAX_READAHEAD 128 /* kbytes */
909#define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
910#define VM_MAX_CACHE_HIT 256 /* max pages in a row in cache before
911 * turning readahead off */
912
913int do_page_cache_readahead(struct address_space *mapping, struct file *filp,
Andrew Morton7361f4d2005-11-07 00:59:28 -0800914 pgoff_t offset, unsigned long nr_to_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
Andrew Morton7361f4d2005-11-07 00:59:28 -0800916 pgoff_t offset, unsigned long nr_to_read);
917unsigned long page_cache_readahead(struct address_space *mapping,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 struct file_ra_state *ra,
919 struct file *filp,
Andrew Morton7361f4d2005-11-07 00:59:28 -0800920 pgoff_t offset,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 unsigned long size);
922void handle_ra_miss(struct address_space *mapping,
923 struct file_ra_state *ra, pgoff_t offset);
924unsigned long max_sane_readahead(unsigned long nr);
925
926/* Do stack extension */
Hugh Dickins46dea3d2005-10-29 18:16:20 -0700927extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
Matthew Wilcox9ab88512005-11-18 16:16:42 -0500928#ifdef CONFIG_IA64
Hugh Dickins46dea3d2005-10-29 18:16:20 -0700929extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
Matthew Wilcox9ab88512005-11-18 16:16:42 -0500930#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931
932/* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
933extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
934extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
935 struct vm_area_struct **pprev);
936
937/* Look up the first VMA which intersects the interval start_addr..end_addr-1,
938 NULL if none. Assume start_addr < end_addr. */
939static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
940{
941 struct vm_area_struct * vma = find_vma(mm,start_addr);
942
943 if (vma && end_addr <= vma->vm_start)
944 vma = NULL;
945 return vma;
946}
947
948static inline unsigned long vma_pages(struct vm_area_struct *vma)
949{
950 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
951}
952
Hugh Dickinsdeceb6c2005-10-29 18:16:33 -0700953struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
954struct page *vmalloc_to_page(void *addr);
955unsigned long vmalloc_to_pfn(void *addr);
956int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
957 unsigned long pfn, unsigned long size, pgprot_t);
Linus Torvaldsa145dd42005-11-30 09:35:19 -0800958int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
Linus Torvalds6aab3412005-11-28 14:34:23 -0800960struct page *follow_page(struct vm_area_struct *, unsigned long address,
Hugh Dickinsdeceb6c2005-10-29 18:16:33 -0700961 unsigned int foll_flags);
962#define FOLL_WRITE 0x01 /* check pte is writable */
963#define FOLL_TOUCH 0x02 /* mark page accessed */
964#define FOLL_GET 0x04 /* do get_page on page */
965#define FOLL_ANON 0x08 /* give ZERO_PAGE if no pgtable */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966
967#ifdef CONFIG_PROC_FS
Hugh Dickinsab50b8e2005-10-29 18:15:56 -0700968void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969#else
Hugh Dickinsab50b8e2005-10-29 18:15:56 -0700970static inline void vm_stat_account(struct mm_struct *mm,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 unsigned long flags, struct file *file, long pages)
972{
973}
974#endif /* CONFIG_PROC_FS */
975
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976#ifndef CONFIG_DEBUG_PAGEALLOC
977static inline void
978kernel_map_pages(struct page *page, int numpages, int enable)
979{
980}
981#endif
982
983extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk);
984#ifdef __HAVE_ARCH_GATE_AREA
985int in_gate_area_no_task(unsigned long addr);
986int in_gate_area(struct task_struct *task, unsigned long addr);
987#else
988int in_gate_area_no_task(unsigned long addr);
989#define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);})
990#endif /* __HAVE_ARCH_GATE_AREA */
991
Andrea Arcangeli79befd02005-04-16 15:24:05 -0700992/* /proc/<pid>/oom_adj set to -17 protects from the oom-killer */
993#define OOM_DISABLE -17
994
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995#endif /* __KERNEL__ */
996#endif /* _LINUX_MM_H */