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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_MM_H
2#define _LINUX_MM_H
3
Linus Torvalds1da177e2005-04-16 15:20:36 -07004#include <linux/errno.h>
5
6#ifdef __KERNEL__
7
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/gfp.h>
9#include <linux/list.h>
10#include <linux/mmzone.h>
11#include <linux/rbtree.h>
12#include <linux/prio_tree.h>
Ingo Molnar9a11b49a2006-07-03 00:24:33 -070013#include <linux/debug_locks.h>
Heiko Carstens5b99cd02006-09-27 01:50:01 -070014#include <linux/mm_types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
16struct mempolicy;
17struct anon_vma;
Alexey Dobriyan4e950f62007-07-30 02:36:13 +040018struct file_ra_state;
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040019struct user_struct;
Alexey Dobriyan4e950f62007-07-30 02:36:13 +040020struct writeback_control;
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
22#ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */
23extern unsigned long max_mapnr;
24#endif
25
26extern unsigned long num_physpages;
27extern void * high_memory;
Linus Torvalds1da177e2005-04-16 15:20:36 -070028extern int page_cluster;
29
30#ifdef CONFIG_SYSCTL
31extern int sysctl_legacy_va_layout;
32#else
33#define sysctl_legacy_va_layout 0
34#endif
35
James Morris42d78962007-12-26 15:12:37 +110036extern unsigned long mmap_min_addr;
37
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <asm/page.h>
39#include <asm/pgtable.h>
40#include <asm/processor.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
43
44/*
45 * Linux kernel virtual memory manager primitives.
46 * The idea being to have a "virtual" mm in the same way
47 * we have a virtual fs - giving a cleaner interface to the
48 * mm details, and allowing different kinds of memory mappings
49 * (from shared memory to executable loading to arbitrary
50 * mmap() functions).
51 */
52
Christoph Lameterc43692e2006-12-06 20:32:48 -080053extern struct kmem_cache *vm_area_cachep;
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055/*
56 * This struct defines the per-mm list of VMAs for uClinux. If CONFIG_MMU is
57 * disabled, then there's a single shared list of VMAs maintained by the
58 * system, and mm's subscribe to these individually
59 */
60struct vm_list_struct {
61 struct vm_list_struct *next;
62 struct vm_area_struct *vma;
63};
64
65#ifndef CONFIG_MMU
66extern struct rb_root nommu_vma_tree;
67extern struct rw_semaphore nommu_vma_sem;
68
69extern unsigned int kobjsize(const void *objp);
70#endif
71
72/*
73 * vm_flags..
74 */
75#define VM_READ 0x00000001 /* currently active flags */
76#define VM_WRITE 0x00000002
77#define VM_EXEC 0x00000004
78#define VM_SHARED 0x00000008
79
Paolo 'Blaisorblade' Giarrusso7e2cff42005-09-21 09:55:39 -070080/* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
82#define VM_MAYWRITE 0x00000020
83#define VM_MAYEXEC 0x00000040
84#define VM_MAYSHARE 0x00000080
85
86#define VM_GROWSDOWN 0x00000100 /* general info on the segment */
87#define VM_GROWSUP 0x00000200
Linus Torvalds6aab3412005-11-28 14:34:23 -080088#define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
Linus Torvalds1da177e2005-04-16 15:20:36 -070089#define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
90
91#define VM_EXECUTABLE 0x00001000
92#define VM_LOCKED 0x00002000
93#define VM_IO 0x00004000 /* Memory mapped I/O or similar */
94
95 /* Used by sys_madvise() */
96#define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
97#define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */
98
99#define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
100#define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
Hugh Dickins0b14c172005-11-21 21:32:15 -0800101#define VM_RESERVED 0x00080000 /* Count as reserved_vm like IO */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102#define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
103#define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
104#define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
105#define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */
Linus Torvalds4d7672b2005-12-16 10:21:23 -0800106#define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */
Roland McGrathe5b97dd2007-01-26 00:56:48 -0800107#define VM_ALWAYSDUMP 0x04000000 /* Always include in core dumps */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Nick Piggind0217ac2007-07-19 01:47:03 -0700109#define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */
Nick Piggind00806b2007-07-19 01:46:57 -0700110
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111#ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
112#define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
113#endif
114
115#ifdef CONFIG_STACK_GROWSUP
116#define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
117#else
118#define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
119#endif
120
121#define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ)
122#define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK
123#define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK))
124#define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ)
125#define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ)
126
127/*
128 * mapping from the currently active vm_flags protection bits (the
129 * low four bits) to a page protection mask..
130 */
131extern pgprot_t protection_map[16];
132
Nick Piggind0217ac2007-07-19 01:47:03 -0700133#define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */
134#define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */
135
136
Nick Piggin54cb8822007-07-19 01:46:59 -0700137/*
Nick Piggind0217ac2007-07-19 01:47:03 -0700138 * vm_fault is filled by the the pagefault handler and passed to the vma's
Nick Piggin83c54072007-07-19 01:47:05 -0700139 * ->fault function. The vma's ->fault is responsible for returning a bitmask
140 * of VM_FAULT_xxx flags that give details about how the fault was handled.
Nick Piggin54cb8822007-07-19 01:46:59 -0700141 *
Nick Piggind0217ac2007-07-19 01:47:03 -0700142 * pgoff should be used in favour of virtual_address, if possible. If pgoff
143 * is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear
144 * mapping support.
Nick Piggin54cb8822007-07-19 01:46:59 -0700145 */
Nick Piggind0217ac2007-07-19 01:47:03 -0700146struct vm_fault {
147 unsigned int flags; /* FAULT_FLAG_xxx flags */
148 pgoff_t pgoff; /* Logical page offset based on vma */
149 void __user *virtual_address; /* Faulting virtual address */
150
151 struct page *page; /* ->fault handlers should return a
Nick Piggin83c54072007-07-19 01:47:05 -0700152 * page here, unless VM_FAULT_NOPAGE
Nick Piggind0217ac2007-07-19 01:47:03 -0700153 * is set (which is also implied by
Nick Piggin83c54072007-07-19 01:47:05 -0700154 * VM_FAULT_ERROR).
Nick Piggind0217ac2007-07-19 01:47:03 -0700155 */
Nick Piggin54cb8822007-07-19 01:46:59 -0700156};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
158/*
159 * These are the virtual MM functions - opening of an area, closing and
160 * unmapping it (needed to keep files on disk up-to-date etc), pointer
161 * to the functions called when a no-page or a wp-page exception occurs.
162 */
163struct vm_operations_struct {
164 void (*open)(struct vm_area_struct * area);
165 void (*close)(struct vm_area_struct * area);
Nick Piggind0217ac2007-07-19 01:47:03 -0700166 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
Nick Piggin54cb8822007-07-19 01:46:59 -0700167 struct page *(*nopage)(struct vm_area_struct *area,
168 unsigned long address, int *type);
169 unsigned long (*nopfn)(struct vm_area_struct *area,
170 unsigned long address);
David Howells9637a5e2006-06-23 02:03:43 -0700171
172 /* notification that a previously read-only page is about to become
173 * writable, if an error is returned it will cause a SIGBUS */
174 int (*page_mkwrite)(struct vm_area_struct *vma, struct page *page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175#ifdef CONFIG_NUMA
176 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
177 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
178 unsigned long addr);
Christoph Lameter7b2259b2006-06-25 05:46:48 -0700179 int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from,
180 const nodemask_t *to, unsigned long flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181#endif
182};
183
184struct mmu_gather;
185struct inode;
186
Andrew Morton349aef02006-01-08 01:04:36 -0800187#define page_private(page) ((page)->private)
188#define set_page_private(page, v) ((page)->private = (v))
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190/*
191 * FIXME: take this include out, include page-flags.h in
192 * files which need it (119 of them)
193 */
194#include <linux/page-flags.h>
195
Nick Piggin725d7042006-09-25 23:30:55 -0700196#ifdef CONFIG_DEBUG_VM
197#define VM_BUG_ON(cond) BUG_ON(cond)
198#else
199#define VM_BUG_ON(condition) do { } while(0)
200#endif
201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202/*
203 * Methods to modify the page usage count.
204 *
205 * What counts for a page usage:
206 * - cache mapping (page->mapping)
207 * - private data (page->private)
208 * - page mapped in a task's page tables, each mapping
209 * is counted separately
210 *
211 * Also, many kernel routines increase the page count before a critical
212 * routine so they can be sure the page doesn't go away from under them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 */
214
215/*
Nick Pigginda6052f2006-09-25 23:31:35 -0700216 * Drop a ref, return true if the refcount fell to zero (the page has no users)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 */
Nick Piggin7c8ee9a2006-03-22 00:08:03 -0800218static inline int put_page_testzero(struct page *page)
219{
Nick Piggin725d7042006-09-25 23:30:55 -0700220 VM_BUG_ON(atomic_read(&page->_count) == 0);
Nick Piggin8dc04ef2006-03-22 00:08:03 -0800221 return atomic_dec_and_test(&page->_count);
Nick Piggin7c8ee9a2006-03-22 00:08:03 -0800222}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224/*
Nick Piggin7c8ee9a2006-03-22 00:08:03 -0800225 * Try to grab a ref unless the page has a refcount of zero, return false if
226 * that is the case.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 */
Nick Piggin7c8ee9a2006-03-22 00:08:03 -0800228static inline int get_page_unless_zero(struct page *page)
229{
Christoph Lameteraec2c3e2008-02-04 22:28:35 -0800230 VM_BUG_ON(PageTail(page));
Nick Piggin8dc04ef2006-03-22 00:08:03 -0800231 return atomic_inc_not_zero(&page->_count);
Nick Piggin7c8ee9a2006-03-22 00:08:03 -0800232}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
Christoph Lameter48667e72008-02-04 22:28:31 -0800234/* Support for virtually mapped pages */
Christoph Lameterb3bdda02008-02-04 22:28:32 -0800235struct page *vmalloc_to_page(const void *addr);
236unsigned long vmalloc_to_pfn(const void *addr);
Christoph Lameter48667e72008-02-04 22:28:31 -0800237
Paul Mundt0738c4b2008-03-12 16:51:31 +0900238/*
239 * Determine if an address is within the vmalloc range
240 *
241 * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there
242 * is no special casing required.
243 */
Christoph Lameter9e2779f2008-02-04 22:28:34 -0800244static inline int is_vmalloc_addr(const void *x)
245{
Paul Mundt0738c4b2008-03-12 16:51:31 +0900246#ifdef CONFIG_MMU
Christoph Lameter9e2779f2008-02-04 22:28:34 -0800247 unsigned long addr = (unsigned long)x;
248
249 return addr >= VMALLOC_START && addr < VMALLOC_END;
Paul Mundt0738c4b2008-03-12 16:51:31 +0900250#else
251 return 0;
David Howells8ca3ed82008-02-23 15:23:37 -0800252#endif
Paul Mundt0738c4b2008-03-12 16:51:31 +0900253}
Christoph Lameter9e2779f2008-02-04 22:28:34 -0800254
Christoph Lameterd85f3382007-05-06 14:49:39 -0700255static inline struct page *compound_head(struct page *page)
256{
Christoph Lameter6d777952007-05-06 14:49:40 -0700257 if (unlikely(PageTail(page)))
Christoph Lameterd85f3382007-05-06 14:49:39 -0700258 return page->first_page;
259 return page;
260}
261
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700262static inline int page_count(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263{
Christoph Lameterd85f3382007-05-06 14:49:39 -0700264 return atomic_read(&compound_head(page)->_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265}
266
267static inline void get_page(struct page *page)
268{
Christoph Lameterd85f3382007-05-06 14:49:39 -0700269 page = compound_head(page);
Nick Piggin725d7042006-09-25 23:30:55 -0700270 VM_BUG_ON(atomic_read(&page->_count) == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 atomic_inc(&page->_count);
272}
273
Christoph Lameterb49af682007-05-06 14:49:41 -0700274static inline struct page *virt_to_head_page(const void *x)
275{
276 struct page *page = virt_to_page(x);
277 return compound_head(page);
278}
279
Nick Piggin7835e982006-03-22 00:08:40 -0800280/*
281 * Setup the page count before being freed into the page allocator for
282 * the first time (boot or memory hotplug)
283 */
284static inline void init_page_count(struct page *page)
285{
286 atomic_set(&page->_count, 1);
287}
288
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289void put_page(struct page *page);
Alexander Zarochentsev1d7ea732006-08-13 23:24:27 -0700290void put_pages_list(struct list_head *pages);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
Nick Piggin8dfcc9b2006-03-22 00:08:05 -0800292void split_page(struct page *page, unsigned int order);
Nick Piggin8dfcc9b2006-03-22 00:08:05 -0800293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294/*
Andy Whitcroft33f2ef82006-12-06 20:33:32 -0800295 * Compound pages have a destructor function. Provide a
296 * prototype for that function and accessor functions.
297 * These are _only_ valid on the head of a PG_compound page.
298 */
299typedef void compound_page_dtor(struct page *);
300
301static inline void set_compound_page_dtor(struct page *page,
302 compound_page_dtor *dtor)
303{
304 page[1].lru.next = (void *)dtor;
305}
306
307static inline compound_page_dtor *get_compound_page_dtor(struct page *page)
308{
309 return (compound_page_dtor *)page[1].lru.next;
310}
311
Christoph Lameterd85f3382007-05-06 14:49:39 -0700312static inline int compound_order(struct page *page)
313{
Christoph Lameter6d777952007-05-06 14:49:40 -0700314 if (!PageHead(page))
Christoph Lameterd85f3382007-05-06 14:49:39 -0700315 return 0;
316 return (unsigned long)page[1].lru.prev;
317}
318
319static inline void set_compound_order(struct page *page, unsigned long order)
320{
321 page[1].lru.prev = (void *)order;
322}
323
Andy Whitcroft33f2ef82006-12-06 20:33:32 -0800324/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 * Multiple processes may "see" the same page. E.g. for untouched
326 * mappings of /dev/null, all processes see the same page full of
327 * zeroes, and text pages of executables and shared libraries have
328 * only one copy in memory, at most, normally.
329 *
330 * For the non-reserved pages, page_count(page) denotes a reference count.
Paolo 'Blaisorblade' Giarrusso7e871b62005-09-21 09:55:38 -0700331 * page_count() == 0 means the page is free. page->lru is then used for
332 * freelist management in the buddy allocator.
Nick Pigginda6052f2006-09-25 23:31:35 -0700333 * page_count() > 0 means the page has been allocated.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 *
Nick Pigginda6052f2006-09-25 23:31:35 -0700335 * Pages are allocated by the slab allocator in order to provide memory
336 * to kmalloc and kmem_cache_alloc. In this case, the management of the
337 * page, and the fields in 'struct page' are the responsibility of mm/slab.c
338 * unless a particular usage is carefully commented. (the responsibility of
339 * freeing the kmalloc memory is the caller's, of course).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 *
Nick Pigginda6052f2006-09-25 23:31:35 -0700341 * A page may be used by anyone else who does a __get_free_page().
342 * In this case, page_count still tracks the references, and should only
343 * be used through the normal accessor functions. The top bits of page->flags
344 * and page->virtual store page management information, but all other fields
345 * are unused and could be used privately, carefully. The management of this
346 * page is the responsibility of the one who allocated it, and those who have
347 * subsequently been given references to it.
348 *
349 * The other pages (we may call them "pagecache pages") are completely
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 * managed by the Linux memory manager: I/O, buffers, swapping etc.
351 * The following discussion applies only to them.
352 *
Nick Pigginda6052f2006-09-25 23:31:35 -0700353 * A pagecache page contains an opaque `private' member, which belongs to the
354 * page's address_space. Usually, this is the address of a circular list of
355 * the page's disk buffers. PG_private must be set to tell the VM to call
356 * into the filesystem to release these pages.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 *
Nick Pigginda6052f2006-09-25 23:31:35 -0700358 * A page may belong to an inode's memory mapping. In this case, page->mapping
359 * is the pointer to the inode, and page->index is the file offset of the page,
360 * in units of PAGE_CACHE_SIZE.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 *
Nick Pigginda6052f2006-09-25 23:31:35 -0700362 * If pagecache pages are not associated with an inode, they are said to be
363 * anonymous pages. These may become associated with the swapcache, and in that
364 * case PG_swapcache is set, and page->private is an offset into the swapcache.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 *
Nick Pigginda6052f2006-09-25 23:31:35 -0700366 * In either case (swapcache or inode backed), the pagecache itself holds one
367 * reference to the page. Setting PG_private should also increment the
368 * refcount. The each user mapping also has a reference to the page.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 *
Nick Pigginda6052f2006-09-25 23:31:35 -0700370 * The pagecache pages are stored in a per-mapping radix tree, which is
371 * rooted at mapping->page_tree, and indexed by offset.
372 * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space
373 * lists, we instead now tag pages as dirty/writeback in the radix tree.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 *
Nick Pigginda6052f2006-09-25 23:31:35 -0700375 * All pagecache pages may be subject to I/O:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 * - inode pages may need to be read from disk,
377 * - inode pages which have been modified and are MAP_SHARED may need
Nick Pigginda6052f2006-09-25 23:31:35 -0700378 * to be written back to the inode on disk,
379 * - anonymous pages (including MAP_PRIVATE file mappings) which have been
380 * modified may need to be swapped out to swap space and (later) to be read
381 * back into memory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 */
383
384/*
385 * The zone field is never updated after free_area_init_core()
386 * sets it, so none of the operations on it need to be atomic.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 */
Dave Hansen348f8b62005-06-23 00:07:40 -0700388
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700389
390/*
391 * page->flags layout:
392 *
393 * There are three possibilities for how page->flags get
394 * laid out. The first is for the normal case, without
395 * sparsemem. The second is for sparsemem when there is
396 * plenty of space for node and section. The last is when
397 * we have run out of space and have to fall back to an
398 * alternate (slower) way of determining the node.
399 *
400 * No sparsemem: | NODE | ZONE | ... | FLAGS |
401 * with space for node: | SECTION | NODE | ZONE | ... | FLAGS |
402 * no space for node: | SECTION | ZONE | ... | FLAGS |
403 */
404#ifdef CONFIG_SPARSEMEM
405#define SECTIONS_WIDTH SECTIONS_SHIFT
406#else
407#define SECTIONS_WIDTH 0
408#endif
409
410#define ZONES_WIDTH ZONES_SHIFT
411
412#if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= FLAGS_RESERVED
413#define NODES_WIDTH NODES_SHIFT
414#else
415#define NODES_WIDTH 0
416#endif
417
418/* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */
Andi Kleen07808b72005-11-05 17:25:53 +0100419#define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH)
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700420#define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH)
421#define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH)
422
423/*
424 * We are going to use the flags for the page to node mapping if its in
425 * there. This includes the case where there is no node, so it is implicit.
426 */
Christoph Lameter89689ae2006-12-06 20:31:45 -0800427#if !(NODES_WIDTH > 0 || NODES_SHIFT == 0)
428#define NODE_NOT_IN_PAGE_FLAGS
429#endif
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700430
431#ifndef PFN_SECTION_SHIFT
432#define PFN_SECTION_SHIFT 0
433#endif
Dave Hansen348f8b62005-06-23 00:07:40 -0700434
435/*
436 * Define the bit shifts to access each section. For non-existant
437 * sections we define the shift as 0; that plus a 0 mask ensures
438 * the compiler will optimise away reference to them.
439 */
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700440#define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0))
441#define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0))
442#define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0))
Dave Hansen348f8b62005-06-23 00:07:40 -0700443
Christoph Lameter89689ae2006-12-06 20:31:45 -0800444/* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allcator */
445#ifdef NODE_NOT_IN_PAGEFLAGS
446#define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT)
Andy Whitcroftbd8029b2007-02-10 01:43:14 -0800447#define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \
448 SECTIONS_PGOFF : ZONES_PGOFF)
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700449#else
Christoph Lameter89689ae2006-12-06 20:31:45 -0800450#define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT)
Andy Whitcroftbd8029b2007-02-10 01:43:14 -0800451#define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \
452 NODES_PGOFF : ZONES_PGOFF)
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700453#endif
Christoph Lameter89689ae2006-12-06 20:31:45 -0800454
Andy Whitcroftbd8029b2007-02-10 01:43:14 -0800455#define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0))
Dave Hansen348f8b62005-06-23 00:07:40 -0700456
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700457#if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > FLAGS_RESERVED
458#error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > FLAGS_RESERVED
Dave Hansen348f8b62005-06-23 00:07:40 -0700459#endif
460
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700461#define ZONES_MASK ((1UL << ZONES_WIDTH) - 1)
462#define NODES_MASK ((1UL << NODES_WIDTH) - 1)
463#define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
Christoph Lameter89689ae2006-12-06 20:31:45 -0800464#define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
Dave Hansen348f8b62005-06-23 00:07:40 -0700465
Christoph Lameter2f1b6242006-09-25 23:31:13 -0700466static inline enum zone_type page_zonenum(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467{
Dave Hansen348f8b62005-06-23 00:07:40 -0700468 return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
Christoph Lameter89689ae2006-12-06 20:31:45 -0800471/*
472 * The identification function is only used by the buddy allocator for
473 * determining if two pages could be buddies. We are not really
474 * identifying a zone since we could be using a the section number
475 * id if we have not node id available in page flags.
476 * We guarantee only that it will return the same value for two
477 * combinable pages in a zone.
478 */
Andy Whitcroftcb2b95e2006-06-23 02:03:01 -0700479static inline int page_zone_id(struct page *page)
480{
Christoph Lameter89689ae2006-12-06 20:31:45 -0800481 return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482}
483
Andy Whitcroft25ba77c2006-12-06 20:33:03 -0800484static inline int zone_to_nid(struct zone *zone)
Christoph Lameter89fa3022006-09-25 23:31:55 -0700485{
Christoph Lameterd5f541e2006-09-27 01:50:08 -0700486#ifdef CONFIG_NUMA
487 return zone->node;
488#else
489 return 0;
490#endif
Christoph Lameter89fa3022006-09-25 23:31:55 -0700491}
492
Christoph Lameter89689ae2006-12-06 20:31:45 -0800493#ifdef NODE_NOT_IN_PAGE_FLAGS
Andy Whitcroft25ba77c2006-12-06 20:33:03 -0800494extern int page_to_nid(struct page *page);
Christoph Lameter89689ae2006-12-06 20:31:45 -0800495#else
Andy Whitcroft25ba77c2006-12-06 20:33:03 -0800496static inline int page_to_nid(struct page *page)
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700497{
Christoph Lameter89689ae2006-12-06 20:31:45 -0800498 return (page->flags >> NODES_PGSHIFT) & NODES_MASK;
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700499}
Christoph Lameter89689ae2006-12-06 20:31:45 -0800500#endif
501
502static inline struct zone *page_zone(struct page *page)
503{
504 return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
505}
506
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700507static inline unsigned long page_to_section(struct page *page)
508{
509 return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK;
510}
511
Christoph Lameter2f1b6242006-09-25 23:31:13 -0700512static inline void set_page_zone(struct page *page, enum zone_type zone)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513{
Dave Hansen348f8b62005-06-23 00:07:40 -0700514 page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
515 page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT;
516}
Christoph Lameter2f1b6242006-09-25 23:31:13 -0700517
Dave Hansen348f8b62005-06-23 00:07:40 -0700518static inline void set_page_node(struct page *page, unsigned long node)
519{
520 page->flags &= ~(NODES_MASK << NODES_PGSHIFT);
521 page->flags |= (node & NODES_MASK) << NODES_PGSHIFT;
522}
Christoph Lameter89689ae2006-12-06 20:31:45 -0800523
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700524static inline void set_page_section(struct page *page, unsigned long section)
525{
526 page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT);
527 page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT;
528}
Dave Hansen348f8b62005-06-23 00:07:40 -0700529
Christoph Lameter2f1b6242006-09-25 23:31:13 -0700530static inline void set_page_links(struct page *page, enum zone_type zone,
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700531 unsigned long node, unsigned long pfn)
Dave Hansen348f8b62005-06-23 00:07:40 -0700532{
533 set_page_zone(page, zone);
534 set_page_node(page, node);
Andy Whitcroftd41dee32005-06-23 00:07:54 -0700535 set_page_section(page, pfn_to_section_nr(pfn));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536}
537
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700538/*
Eric Paris7cd94142007-11-26 18:47:40 -0500539 * If a hint addr is less than mmap_min_addr change hint to be as
540 * low as possible but still greater than mmap_min_addr
541 */
542static inline unsigned long round_hint_to_min(unsigned long hint)
543{
544#ifdef CONFIG_SECURITY
545 hint &= PAGE_MASK;
546 if (((void *)hint != NULL) &&
547 (hint < mmap_min_addr))
548 return PAGE_ALIGN(mmap_min_addr);
549#endif
550 return hint;
551}
552
553/*
Christoph Lameterf6ac2352006-06-30 01:55:32 -0700554 * Some inline functions in vmstat.h depend on page_zone()
555 */
556#include <linux/vmstat.h>
557
Ingo Molnar652050a2006-01-14 13:21:30 -0800558static __always_inline void *lowmem_page_address(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559{
560 return __va(page_to_pfn(page) << PAGE_SHIFT);
561}
562
563#if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
564#define HASHED_PAGE_VIRTUAL
565#endif
566
567#if defined(WANT_PAGE_VIRTUAL)
568#define page_address(page) ((page)->virtual)
569#define set_page_address(page, address) \
570 do { \
571 (page)->virtual = (address); \
572 } while(0)
573#define page_address_init() do { } while(0)
574#endif
575
576#if defined(HASHED_PAGE_VIRTUAL)
577void *page_address(struct page *page);
578void set_page_address(struct page *page, void *virtual);
579void page_address_init(void);
580#endif
581
582#if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
583#define page_address(page) lowmem_page_address(page)
584#define set_page_address(page, address) do { } while(0)
585#define page_address_init() do { } while(0)
586#endif
587
588/*
589 * On an anonymous page mapped into a user virtual memory area,
590 * page->mapping points to its anon_vma, not to a struct address_space;
591 * with the PAGE_MAPPING_ANON bit set to distinguish it.
592 *
593 * Please note that, confusingly, "page_mapping" refers to the inode
594 * address_space which maps the page from disk; whereas "page_mapped"
595 * refers to user virtual address space into which the page is mapped.
596 */
597#define PAGE_MAPPING_ANON 1
598
599extern struct address_space swapper_space;
600static inline struct address_space *page_mapping(struct page *page)
601{
602 struct address_space *mapping = page->mapping;
603
Christoph Lameterb5fab14e2007-07-17 04:03:33 -0700604 VM_BUG_ON(PageSlab(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 if (unlikely(PageSwapCache(page)))
606 mapping = &swapper_space;
607 else if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON))
608 mapping = NULL;
609 return mapping;
610}
611
612static inline int PageAnon(struct page *page)
613{
614 return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0;
615}
616
617/*
618 * Return the pagecache index of the passed page. Regular pagecache pages
619 * use ->index whereas swapcache pages use ->private
620 */
621static inline pgoff_t page_index(struct page *page)
622{
623 if (unlikely(PageSwapCache(page)))
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700624 return page_private(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 return page->index;
626}
627
628/*
629 * The atomic page->_mapcount, like _count, starts from -1:
630 * so that transitions both from it and to it can be tracked,
631 * using atomic_inc_and_test and atomic_add_negative(-1).
632 */
633static inline void reset_page_mapcount(struct page *page)
634{
635 atomic_set(&(page)->_mapcount, -1);
636}
637
638static inline int page_mapcount(struct page *page)
639{
640 return atomic_read(&(page)->_mapcount) + 1;
641}
642
643/*
644 * Return true if this page is mapped into pagetables.
645 */
646static inline int page_mapped(struct page *page)
647{
648 return atomic_read(&(page)->_mapcount) >= 0;
649}
650
651/*
652 * Error return values for the *_nopage functions
653 */
654#define NOPAGE_SIGBUS (NULL)
655#define NOPAGE_OOM ((struct page *) (-1))
656
657/*
Jes Sorensenf4b81802006-09-27 01:50:10 -0700658 * Error return values for the *_nopfn functions
659 */
660#define NOPFN_SIGBUS ((unsigned long) -1)
661#define NOPFN_OOM ((unsigned long) -2)
Benjamin Herrenschmidt22cd25e2007-02-12 00:51:38 -0800662#define NOPFN_REFAULT ((unsigned long) -3)
Jes Sorensenf4b81802006-09-27 01:50:10 -0700663
664/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 * Different kinds of faults, as returned by handle_mm_fault().
666 * Used to decide whether a process gets delivered SIGBUS or
667 * just gets major/minor fault counters bumped up.
668 */
Nick Piggind0217ac2007-07-19 01:47:03 -0700669
Nick Piggin83c54072007-07-19 01:47:05 -0700670#define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */
Nick Piggind0217ac2007-07-19 01:47:03 -0700671
Nick Piggin83c54072007-07-19 01:47:05 -0700672#define VM_FAULT_OOM 0x0001
673#define VM_FAULT_SIGBUS 0x0002
674#define VM_FAULT_MAJOR 0x0004
675#define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */
Nick Pigginf33ea7f2005-08-03 20:24:01 +1000676
Nick Piggin83c54072007-07-19 01:47:05 -0700677#define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */
678#define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
Nick Piggin83c54072007-07-19 01:47:05 -0700680#define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS)
Nick Piggind0217ac2007-07-19 01:47:03 -0700681
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
683
684extern void show_free_areas(void);
685
686#ifdef CONFIG_SHMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687int shmem_lock(struct file *file, int lock, struct user_struct *user);
688#else
Russell King03b00eb2006-01-06 00:10:52 -0800689static inline int shmem_lock(struct file *file, int lock,
690 struct user_struct *user)
691{
692 return 0;
693}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694#endif
695struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags);
696
697int shmem_zero_setup(struct vm_area_struct *);
698
David Howellsb0e15192006-01-06 00:11:42 -0800699#ifndef CONFIG_MMU
700extern unsigned long shmem_get_unmapped_area(struct file *file,
701 unsigned long addr,
702 unsigned long len,
703 unsigned long pgoff,
704 unsigned long flags);
705#endif
706
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +0400707extern int can_do_mlock(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708extern int user_shm_lock(size_t, struct user_struct *);
709extern void user_shm_unlock(size_t, struct user_struct *);
710
711/*
712 * Parameter block passed down to zap_pte_range in exceptional cases.
713 */
714struct zap_details {
715 struct vm_area_struct *nonlinear_vma; /* Check page->index if set */
716 struct address_space *check_mapping; /* Check page->mapping if set */
717 pgoff_t first_index; /* Lowest page->index to unmap */
718 pgoff_t last_index; /* Highest page->index to unmap */
719 spinlock_t *i_mmap_lock; /* For unmap_mapping_range: */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 unsigned long truncate_count; /* Compare vm_truncate_count */
721};
722
Linus Torvalds6aab3412005-11-28 14:34:23 -0800723struct page *vm_normal_page(struct vm_area_struct *, unsigned long, pte_t);
Hugh Dickinsee39b372005-04-19 13:29:15 -0700724unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 unsigned long size, struct zap_details *);
Hugh Dickins508034a2005-10-29 18:16:30 -0700726unsigned long unmap_vmas(struct mmu_gather **tlb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 struct vm_area_struct *start_vma, unsigned long start_addr,
728 unsigned long end_addr, unsigned long *nr_accounted,
729 struct zap_details *);
Matt Mackalle6473092008-02-04 22:29:01 -0800730
731/**
732 * mm_walk - callbacks for walk_page_range
733 * @pgd_entry: if set, called for each non-empty PGD (top-level) entry
734 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
735 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
736 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
737 * @pte_hole: if set, called for each hole at all levels
738 *
739 * (see walk_page_range for more details)
740 */
741struct mm_walk {
742 int (*pgd_entry)(pgd_t *, unsigned long, unsigned long, void *);
743 int (*pud_entry)(pud_t *, unsigned long, unsigned long, void *);
744 int (*pmd_entry)(pmd_t *, unsigned long, unsigned long, void *);
745 int (*pte_entry)(pte_t *, unsigned long, unsigned long, void *);
746 int (*pte_hole)(unsigned long, unsigned long, void *);
747};
748
749int walk_page_range(const struct mm_struct *, unsigned long addr,
750 unsigned long end, const struct mm_walk *walk,
751 void *private);
Hugh Dickins3bf5ee92005-04-19 13:29:16 -0700752void free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
753 unsigned long end, unsigned long floor, unsigned long ceiling);
754void free_pgtables(struct mmu_gather **tlb, struct vm_area_struct *start_vma,
Hugh Dickinse0da3822005-04-19 13:29:15 -0700755 unsigned long floor, unsigned long ceiling);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
757 struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758void unmap_mapping_range(struct address_space *mapping,
759 loff_t const holebegin, loff_t const holelen, int even_cows);
760
761static inline void unmap_shared_mapping_range(struct address_space *mapping,
762 loff_t const holebegin, loff_t const holelen)
763{
764 unmap_mapping_range(mapping, holebegin, holelen, 0);
765}
766
767extern int vmtruncate(struct inode * inode, loff_t offset);
Badari Pulavartyf6b3ec22006-01-06 00:10:38 -0800768extern int vmtruncate_range(struct inode * inode, loff_t offset, loff_t end);
Nick Pigginf33ea7f2005-08-03 20:24:01 +1000769
David Howells7ee1dd32006-01-06 00:11:44 -0800770#ifdef CONFIG_MMU
Nick Piggin83c54072007-07-19 01:47:05 -0700771extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
David Howells7ee1dd32006-01-06 00:11:44 -0800772 unsigned long address, int write_access);
David Howells7ee1dd32006-01-06 00:11:44 -0800773#else
774static inline int handle_mm_fault(struct mm_struct *mm,
775 struct vm_area_struct *vma, unsigned long address,
776 int write_access)
777{
778 /* should never happen if there's no MMU */
779 BUG();
780 return VM_FAULT_SIGBUS;
781}
782#endif
Nick Pigginf33ea7f2005-08-03 20:24:01 +1000783
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784extern int make_pages_present(unsigned long addr, unsigned long end);
785extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
787int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start,
788 int len, int write, int force, struct page **pages, struct vm_area_struct **vmas);
Nick Pigginb5810032005-10-29 18:16:12 -0700789void print_bad_pte(struct vm_area_struct *, pte_t, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
David Howellscf9a2ae2006-08-29 19:05:54 +0100791extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
792extern void do_invalidatepage(struct page *page, unsigned long offset);
793
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794int __set_page_dirty_nobuffers(struct page *page);
Ken Chen76719322007-02-10 01:43:15 -0800795int __set_page_dirty_no_writeback(struct page *page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796int redirty_page_for_writepage(struct writeback_control *wbc,
797 struct page *page);
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800798int set_page_dirty(struct page *page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799int set_page_dirty_lock(struct page *page);
800int clear_page_dirty_for_io(struct page *page);
801
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700802extern unsigned long move_page_tables(struct vm_area_struct *vma,
803 unsigned long old_addr, struct vm_area_struct *new_vma,
804 unsigned long new_addr, unsigned long len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805extern unsigned long do_mremap(unsigned long addr,
806 unsigned long old_len, unsigned long new_len,
807 unsigned long flags, unsigned long new_addr);
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700808extern int mprotect_fixup(struct vm_area_struct *vma,
809 struct vm_area_struct **pprev, unsigned long start,
810 unsigned long end, unsigned long newflags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
812/*
Rusty Russell8e1f9362007-07-17 04:03:17 -0700813 * A callback you can register to apply pressure to ageable caches.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 *
Rusty Russell8e1f9362007-07-17 04:03:17 -0700815 * 'shrink' is passed a count 'nr_to_scan' and a 'gfpmask'. It should
816 * look through the least-recently-used 'nr_to_scan' entries and
817 * attempt to free them up. It should return the number of objects
818 * which remain in the cache. If it returns -1, it means it cannot do
819 * any scanning at this time (eg. there is a risk of deadlock).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 *
Rusty Russell8e1f9362007-07-17 04:03:17 -0700821 * The 'gfpmask' refers to the allocation we are currently trying to
822 * fulfil.
823 *
824 * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is
825 * querying the cache size, so a fastpath for that case is appropriate.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 */
Rusty Russell8e1f9362007-07-17 04:03:17 -0700827struct shrinker {
828 int (*shrink)(int nr_to_scan, gfp_t gfp_mask);
829 int seeks; /* seeks to recreate an obj */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
Rusty Russell8e1f9362007-07-17 04:03:17 -0700831 /* These are for internal use */
832 struct list_head list;
833 long nr; /* objs pending delete */
834};
835#define DEFAULT_SEEKS 2 /* A good number if you don't know better. */
836extern void register_shrinker(struct shrinker *);
837extern void unregister_shrinker(struct shrinker *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
Alexey Dobriyan4e950f62007-07-30 02:36:13 +0400839int vma_wants_writenotify(struct vm_area_struct *vma);
Peter Zijlstrad08b3852006-09-25 23:30:57 -0700840
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800841extern pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, spinlock_t **ptl);
Linus Torvaldsc9cfcdd2005-11-29 14:03:14 -0800842
Nick Piggin5f22df02007-05-06 14:49:02 -0700843#ifdef __PAGETABLE_PUD_FOLDED
844static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd,
845 unsigned long address)
846{
847 return 0;
848}
849#else
Hugh Dickins1bb36302005-10-29 18:16:22 -0700850int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
Nick Piggin5f22df02007-05-06 14:49:02 -0700851#endif
852
853#ifdef __PAGETABLE_PMD_FOLDED
854static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud,
855 unsigned long address)
856{
857 return 0;
858}
859#else
Hugh Dickins1bb36302005-10-29 18:16:22 -0700860int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
Nick Piggin5f22df02007-05-06 14:49:02 -0700861#endif
862
Hugh Dickins1bb36302005-10-29 18:16:22 -0700863int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address);
864int __pte_alloc_kernel(pmd_t *pmd, unsigned long address);
865
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866/*
867 * The following ifdef needed to get the 4level-fixup.h header to work.
868 * Remove it when 4level-fixup.h has been removed.
869 */
Hugh Dickins1bb36302005-10-29 18:16:22 -0700870#if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
872{
Hugh Dickins1bb36302005-10-29 18:16:22 -0700873 return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))?
874 NULL: pud_offset(pgd, address);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875}
876
877static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
878{
Hugh Dickins1bb36302005-10-29 18:16:22 -0700879 return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
880 NULL: pmd_offset(pud, address);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881}
Hugh Dickins1bb36302005-10-29 18:16:22 -0700882#endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */
883
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700884#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
885/*
886 * We tuck a spinlock to guard each pagetable page into its struct page,
887 * at page->private, with BUILD_BUG_ON to make sure that this will not
888 * overflow into the next struct page (as it might with DEBUG_SPINLOCK).
889 * When freeing, reset page->mapping so free_pages_check won't complain.
890 */
Andrew Morton349aef02006-01-08 01:04:36 -0800891#define __pte_lockptr(page) &((page)->ptl)
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700892#define pte_lock_init(_page) do { \
893 spin_lock_init(__pte_lockptr(_page)); \
894} while (0)
895#define pte_lock_deinit(page) ((page)->mapping = NULL)
896#define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));})
897#else
898/*
899 * We use mm->page_table_lock to guard all pagetable pages of the mm.
900 */
901#define pte_lock_init(page) do {} while (0)
902#define pte_lock_deinit(page) do {} while (0)
903#define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;})
904#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
905
Martin Schwidefsky2f569af2008-02-08 04:22:04 -0800906static inline void pgtable_page_ctor(struct page *page)
907{
908 pte_lock_init(page);
909 inc_zone_page_state(page, NR_PAGETABLE);
910}
911
912static inline void pgtable_page_dtor(struct page *page)
913{
914 pte_lock_deinit(page);
915 dec_zone_page_state(page, NR_PAGETABLE);
916}
917
Hugh Dickinsc74df322005-10-29 18:16:23 -0700918#define pte_offset_map_lock(mm, pmd, address, ptlp) \
919({ \
Hugh Dickins4c21e2f2005-10-29 18:16:40 -0700920 spinlock_t *__ptl = pte_lockptr(mm, pmd); \
Hugh Dickinsc74df322005-10-29 18:16:23 -0700921 pte_t *__pte = pte_offset_map(pmd, address); \
922 *(ptlp) = __ptl; \
923 spin_lock(__ptl); \
924 __pte; \
925})
926
927#define pte_unmap_unlock(pte, ptl) do { \
928 spin_unlock(ptl); \
929 pte_unmap(pte); \
930} while (0)
931
Hugh Dickins1bb36302005-10-29 18:16:22 -0700932#define pte_alloc_map(mm, pmd, address) \
933 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \
934 NULL: pte_offset_map(pmd, address))
935
Hugh Dickinsc74df322005-10-29 18:16:23 -0700936#define pte_alloc_map_lock(mm, pmd, address, ptlp) \
937 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \
938 NULL: pte_offset_map_lock(mm, pmd, address, ptlp))
939
Hugh Dickins1bb36302005-10-29 18:16:22 -0700940#define pte_alloc_kernel(pmd, address) \
941 ((unlikely(!pmd_present(*(pmd))) && __pte_alloc_kernel(pmd, address))? \
942 NULL: pte_offset_kernel(pmd, address))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943
944extern void free_area_init(unsigned long * zones_size);
945extern void free_area_init_node(int nid, pg_data_t *pgdat,
946 unsigned long * zones_size, unsigned long zone_start_pfn,
947 unsigned long *zholes_size);
Mel Gormanc7132162006-09-27 01:49:43 -0700948#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
949/*
950 * With CONFIG_ARCH_POPULATES_NODE_MAP set, an architecture may initialise its
951 * zones, allocate the backing mem_map and account for memory holes in a more
952 * architecture independent manner. This is a substitute for creating the
953 * zone_sizes[] and zholes_size[] arrays and passing them to
954 * free_area_init_node()
955 *
956 * An architecture is expected to register range of page frames backed by
957 * physical memory with add_active_range() before calling
958 * free_area_init_nodes() passing in the PFN each zone ends at. At a basic
959 * usage, an architecture is expected to do something like
960 *
961 * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn,
962 * max_highmem_pfn};
963 * for_each_valid_physical_page_range()
964 * add_active_range(node_id, start_pfn, end_pfn)
965 * free_area_init_nodes(max_zone_pfns);
966 *
967 * If the architecture guarantees that there are no holes in the ranges
968 * registered with add_active_range(), free_bootmem_active_regions()
969 * will call free_bootmem_node() for each registered physical page range.
970 * Similarly sparse_memory_present_with_active_regions() calls
971 * memory_present() for each range when SPARSEMEM is enabled.
972 *
973 * See mm/page_alloc.c for more information on each function exposed by
974 * CONFIG_ARCH_POPULATES_NODE_MAP
975 */
976extern void free_area_init_nodes(unsigned long *max_zone_pfn);
977extern void add_active_range(unsigned int nid, unsigned long start_pfn,
978 unsigned long end_pfn);
979extern void shrink_active_range(unsigned int nid, unsigned long old_end_pfn,
980 unsigned long new_end_pfn);
Mel Gormanfb014392006-09-27 01:49:59 -0700981extern void push_node_boundaries(unsigned int nid, unsigned long start_pfn,
982 unsigned long end_pfn);
Mel Gormanc7132162006-09-27 01:49:43 -0700983extern void remove_all_active_ranges(void);
984extern unsigned long absent_pages_in_range(unsigned long start_pfn,
985 unsigned long end_pfn);
986extern void get_pfn_range_for_nid(unsigned int nid,
987 unsigned long *start_pfn, unsigned long *end_pfn);
988extern unsigned long find_min_pfn_with_active_regions(void);
989extern unsigned long find_max_pfn_with_active_regions(void);
990extern void free_bootmem_with_active_regions(int nid,
991 unsigned long max_low_pfn);
992extern void sparse_memory_present_with_active_regions(int nid);
993#ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
994extern int early_pfn_to_nid(unsigned long pfn);
995#endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
996#endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
Mel Gorman0e0b8642006-09-27 01:49:56 -0700997extern void set_dma_reserve(unsigned long new_dma_reserve);
Dave Hansena2f3aa022007-01-10 23:15:30 -0800998extern void memmap_init_zone(unsigned long, int, unsigned long,
999 unsigned long, enum memmap_context);
Dave Hansen3947be12005-10-29 18:16:54 -07001000extern void setup_per_zone_pages_min(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001extern void mem_init(void);
1002extern void show_mem(void);
1003extern void si_meminfo(struct sysinfo * val);
1004extern void si_meminfo_node(struct sysinfo *val, int nid);
1005
Christoph Lametere7c8d5c2005-06-21 17:14:47 -07001006#ifdef CONFIG_NUMA
1007extern void setup_per_cpu_pageset(void);
1008#else
1009static inline void setup_per_cpu_pageset(void) {}
1010#endif
1011
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012/* prio_tree.c */
1013void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old);
1014void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *);
1015void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *);
1016struct vm_area_struct *vma_prio_tree_next(struct vm_area_struct *vma,
1017 struct prio_tree_iter *iter);
1018
1019#define vma_prio_tree_foreach(vma, iter, root, begin, end) \
1020 for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \
1021 (vma = vma_prio_tree_next(vma, iter)); )
1022
1023static inline void vma_nonlinear_insert(struct vm_area_struct *vma,
1024 struct list_head *list)
1025{
1026 vma->shared.vm_set.parent = NULL;
1027 list_add_tail(&vma->shared.vm_set.list, list);
1028}
1029
1030/* mmap.c */
Alan Cox34b4e4a2007-08-22 14:01:28 -07001031extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032extern void vma_adjust(struct vm_area_struct *vma, unsigned long start,
1033 unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
1034extern struct vm_area_struct *vma_merge(struct mm_struct *,
1035 struct vm_area_struct *prev, unsigned long addr, unsigned long end,
1036 unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
1037 struct mempolicy *);
1038extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
1039extern int split_vma(struct mm_struct *,
1040 struct vm_area_struct *, unsigned long addr, int new_below);
1041extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
1042extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
1043 struct rb_node **, struct rb_node *);
Hugh Dickinsa8fb5612005-10-29 18:15:57 -07001044extern void unlink_file_vma(struct vm_area_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
1046 unsigned long addr, unsigned long len, pgoff_t pgoff);
1047extern void exit_mmap(struct mm_struct *);
akpm@osdl.org119f6572005-05-01 08:58:35 -07001048extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
Roland McGrathfa5dc222007-02-08 14:20:41 -08001049extern int install_special_mapping(struct mm_struct *mm,
1050 unsigned long addr, unsigned long len,
1051 unsigned long flags, struct page **pages);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052
1053extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
1054
1055extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
1056 unsigned long len, unsigned long prot,
1057 unsigned long flag, unsigned long pgoff);
Miklos Szeredi0165ab42007-07-15 23:38:26 -07001058extern unsigned long mmap_region(struct file *file, unsigned long addr,
1059 unsigned long len, unsigned long flags,
1060 unsigned int vm_flags, unsigned long pgoff,
1061 int accountable);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062
1063static inline unsigned long do_mmap(struct file *file, unsigned long addr,
1064 unsigned long len, unsigned long prot,
1065 unsigned long flag, unsigned long offset)
1066{
1067 unsigned long ret = -EINVAL;
1068 if ((offset + PAGE_ALIGN(len)) < offset)
1069 goto out;
1070 if (!(offset & ~PAGE_MASK))
1071 ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT);
1072out:
1073 return ret;
1074}
1075
1076extern int do_munmap(struct mm_struct *, unsigned long, size_t);
1077
1078extern unsigned long do_brk(unsigned long, unsigned long);
1079
1080/* filemap.c */
1081extern unsigned long page_unuse(struct page *);
1082extern void truncate_inode_pages(struct address_space *, loff_t);
Hans Reiserd7339072006-01-06 00:10:36 -08001083extern void truncate_inode_pages_range(struct address_space *,
1084 loff_t lstart, loff_t lend);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085
1086/* generic vm_area_ops exported for stackable file systems */
Nick Piggind0217ac2007-07-19 01:47:03 -07001087extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
1089/* mm/page-writeback.c */
1090int write_one_page(struct page *page, int wait);
1091
1092/* readahead.c */
1093#define VM_MAX_READAHEAD 128 /* kbytes */
1094#define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095
1096int do_page_cache_readahead(struct address_space *mapping, struct file *filp,
Andrew Morton7361f4d2005-11-07 00:59:28 -08001097 pgoff_t offset, unsigned long nr_to_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
Andrew Morton7361f4d2005-11-07 00:59:28 -08001099 pgoff_t offset, unsigned long nr_to_read);
Rusty Russellcf914a72007-07-19 01:48:08 -07001100
1101void page_cache_sync_readahead(struct address_space *mapping,
1102 struct file_ra_state *ra,
1103 struct file *filp,
1104 pgoff_t offset,
1105 unsigned long size);
1106
1107void page_cache_async_readahead(struct address_space *mapping,
1108 struct file_ra_state *ra,
1109 struct file *filp,
1110 struct page *pg,
1111 pgoff_t offset,
1112 unsigned long size);
1113
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114unsigned long max_sane_readahead(unsigned long nr);
1115
1116/* Do stack extension */
Hugh Dickins46dea3d2005-10-29 18:16:20 -07001117extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
Matthew Wilcox9ab88512005-11-18 16:16:42 -05001118#ifdef CONFIG_IA64
Hugh Dickins46dea3d2005-10-29 18:16:20 -07001119extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
Matthew Wilcox9ab88512005-11-18 16:16:42 -05001120#endif
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001121extern int expand_stack_downwards(struct vm_area_struct *vma,
1122 unsigned long address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123
1124/* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
1125extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);
1126extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
1127 struct vm_area_struct **pprev);
1128
1129/* Look up the first VMA which intersects the interval start_addr..end_addr-1,
1130 NULL if none. Assume start_addr < end_addr. */
1131static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr)
1132{
1133 struct vm_area_struct * vma = find_vma(mm,start_addr);
1134
1135 if (vma && end_addr <= vma->vm_start)
1136 vma = NULL;
1137 return vma;
1138}
1139
1140static inline unsigned long vma_pages(struct vm_area_struct *vma)
1141{
1142 return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
1143}
1144
Hugh Dickins804af2c2006-07-26 21:39:49 +01001145pgprot_t vm_get_page_prot(unsigned long vm_flags);
Hugh Dickinsdeceb6c2005-10-29 18:16:33 -07001146struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
Hugh Dickinsdeceb6c2005-10-29 18:16:33 -07001147int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
1148 unsigned long pfn, unsigned long size, pgprot_t);
Linus Torvaldsa145dd42005-11-30 09:35:19 -08001149int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *);
Nick Piggine0dc0d82007-02-12 00:51:36 -08001150int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
1151 unsigned long pfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152
Linus Torvalds6aab3412005-11-28 14:34:23 -08001153struct page *follow_page(struct vm_area_struct *, unsigned long address,
Hugh Dickinsdeceb6c2005-10-29 18:16:33 -07001154 unsigned int foll_flags);
1155#define FOLL_WRITE 0x01 /* check pte is writable */
1156#define FOLL_TOUCH 0x02 /* mark page accessed */
1157#define FOLL_GET 0x04 /* do get_page on page */
1158#define FOLL_ANON 0x08 /* give ZERO_PAGE if no pgtable */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159
Martin Schwidefsky2f569af2008-02-08 04:22:04 -08001160typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
Jeremy Fitzhardingeaee16b32007-05-06 14:48:54 -07001161 void *data);
1162extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
1163 unsigned long size, pte_fn_t fn, void *data);
1164
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165#ifdef CONFIG_PROC_FS
Hugh Dickinsab50b8e2005-10-29 18:15:56 -07001166void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167#else
Hugh Dickinsab50b8e2005-10-29 18:15:56 -07001168static inline void vm_stat_account(struct mm_struct *mm,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 unsigned long flags, struct file *file, long pages)
1170{
1171}
1172#endif /* CONFIG_PROC_FS */
1173
Ingo Molnar12d6f212008-01-30 13:33:58 +01001174#ifdef CONFIG_DEBUG_PAGEALLOC
1175extern int debug_pagealloc_enabled;
1176
1177extern void kernel_map_pages(struct page *page, int numpages, int enable);
1178
1179static inline void enable_debug_pagealloc(void)
1180{
1181 debug_pagealloc_enabled = 1;
1182}
Rafael J. Wysocki8a235ef2008-02-20 01:47:44 +01001183#ifdef CONFIG_HIBERNATION
1184extern bool kernel_page_present(struct page *page);
1185#endif /* CONFIG_HIBERNATION */
Ingo Molnar12d6f212008-01-30 13:33:58 +01001186#else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187static inline void
Nick Piggin9858db52006-10-11 01:21:30 -07001188kernel_map_pages(struct page *page, int numpages, int enable) {}
Ingo Molnar12d6f212008-01-30 13:33:58 +01001189static inline void enable_debug_pagealloc(void)
1190{
1191}
Rafael J. Wysocki8a235ef2008-02-20 01:47:44 +01001192#ifdef CONFIG_HIBERNATION
1193static inline bool kernel_page_present(struct page *page) { return true; }
1194#endif /* CONFIG_HIBERNATION */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195#endif
1196
1197extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk);
1198#ifdef __HAVE_ARCH_GATE_AREA
1199int in_gate_area_no_task(unsigned long addr);
1200int in_gate_area(struct task_struct *task, unsigned long addr);
1201#else
1202int in_gate_area_no_task(unsigned long addr);
1203#define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);})
1204#endif /* __HAVE_ARCH_GATE_AREA */
1205
Andrew Morton9d0243b2006-01-08 01:00:39 -08001206int drop_caches_sysctl_handler(struct ctl_table *, int, struct file *,
1207 void __user *, size_t *, loff_t *);
Andrew Morton69e05942006-03-22 00:08:19 -08001208unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask,
Andrew Morton9d0243b2006-01-08 01:00:39 -08001209 unsigned long lru_pages);
1210void drop_pagecache(void);
1211void drop_slab(void);
1212
Luke Yang7a9166e2006-02-20 18:28:07 -08001213#ifndef CONFIG_MMU
1214#define randomize_va_space 0
1215#else
Andi Kleena62eaf12006-02-16 23:41:58 +01001216extern int randomize_va_space;
Luke Yang7a9166e2006-02-20 18:28:07 -08001217#endif
Andi Kleena62eaf12006-02-16 23:41:58 +01001218
Sam Ravnborg045e72a2007-07-26 10:41:13 -07001219const char * arch_vma_name(struct vm_area_struct *vma);
Andi Kleen03252912008-01-30 13:33:18 +01001220void print_vma_addr(char *prefix, unsigned long rip);
Ingo Molnare6e54942006-06-27 02:53:50 -07001221
Yasunori Goto98f3cfc2007-10-16 01:26:14 -07001222struct page *sparse_mem_map_populate(unsigned long pnum, int nid);
Andy Whitcroft29c71112007-10-16 01:24:14 -07001223pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
1224pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node);
1225pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
1226pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
Christoph Lameter8f6aac42007-10-16 01:24:13 -07001227void *vmemmap_alloc_block(unsigned long size, int node);
1228void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
Andy Whitcroft29c71112007-10-16 01:24:14 -07001229int vmemmap_populate_basepages(struct page *start_page,
1230 unsigned long pages, int node);
1231int vmemmap_populate(struct page *start_page, unsigned long pages, int node);
Christoph Lameter8f6aac42007-10-16 01:24:13 -07001232
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233#endif /* __KERNEL__ */
1234#endif /* _LINUX_MM_H */