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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* internal.h: mm/ internal definitions
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
Nick Piggin0f8053a2006-03-22 00:08:33 -080011#ifndef __MM_INTERNAL_H
12#define __MM_INTERNAL_H
13
14#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
Jan Beulich42b77722008-07-23 21:27:10 -070016void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
17 unsigned long floor, unsigned long ceiling);
18
Nick Piggin7835e982006-03-22 00:08:40 -080019static inline void set_page_count(struct page *page, int v)
Nick Piggin77a8a782006-01-06 00:10:57 -080020{
Nick Piggin7835e982006-03-22 00:08:40 -080021 atomic_set(&page->_count, v);
22}
23
24/*
25 * Turn a non-refcounted page (->_count == 0) into refcounted with
26 * a count of one.
27 */
28static inline void set_page_refcounted(struct page *page)
29{
Qi Yongae1276b2008-02-04 22:29:27 -080030 VM_BUG_ON(PageTail(page));
Nick Piggin725d7042006-09-25 23:30:55 -070031 VM_BUG_ON(atomic_read(&page->_count));
Nick Piggin77a8a782006-01-06 00:10:57 -080032 set_page_count(page, 1);
Nick Piggin77a8a782006-01-06 00:10:57 -080033}
34
Nick Piggin0f8053a2006-03-22 00:08:33 -080035static inline void __put_page(struct page *page)
36{
37 atomic_dec(&page->_count);
38}
39
Lee Schermerhorn894bc312008-10-18 20:26:39 -070040/*
41 * in mm/vmscan.c:
42 */
Nick Piggin62695a82008-10-18 20:26:09 -070043extern int isolate_lru_page(struct page *page);
Lee Schermerhorn894bc312008-10-18 20:26:39 -070044extern void putback_lru_page(struct page *page);
Nick Piggin62695a82008-10-18 20:26:09 -070045
Lee Schermerhorn894bc312008-10-18 20:26:39 -070046/*
47 * in mm/page_alloc.c
48 */
Hugh Dickins22b31ee2009-01-06 14:40:09 -080049extern unsigned long highest_memmap_pfn;
Yasunori Goto0c0a4a52008-04-28 02:13:34 -070050extern void __free_pages_bootmem(struct page *page, unsigned int order);
Wu Fengguang20a03072009-06-16 15:32:22 -070051extern void prep_compound_page(struct page *page, unsigned long order);
52
Nick Piggin0f8053a2006-03-22 00:08:33 -080053
Mel Gorman48f13bf2007-10-16 01:26:10 -070054/*
55 * function for dealing with page's order in buddy system.
56 * zone->lock is already acquired when we use these.
57 * So, we don't need atomic page->flags operations here.
58 */
59static inline unsigned long page_order(struct page *page)
60{
61 VM_BUG_ON(!PageBuddy(page));
62 return page_private(page);
63}
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -080064
David Howells33925b22009-03-31 15:23:26 -070065#ifdef CONFIG_HAVE_MLOCK
Rik van Rielba470de2008-10-18 20:26:50 -070066extern long mlock_vma_pages_range(struct vm_area_struct *vma,
Nick Pigginb291f002008-10-18 20:26:44 -070067 unsigned long start, unsigned long end);
Rik van Rielba470de2008-10-18 20:26:50 -070068extern void munlock_vma_pages_range(struct vm_area_struct *vma,
69 unsigned long start, unsigned long end);
70static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
71{
72 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
73}
David Howells33925b22009-03-31 15:23:26 -070074#endif
Nick Pigginb291f002008-10-18 20:26:44 -070075
Lee Schermerhorn894bc312008-10-18 20:26:39 -070076/*
77 * unevictable_migrate_page() called only from migrate_page_copy() to
78 * migrate unevictable flag to new page.
79 * Note that the old page has been isolated from the LRU lists at this
80 * point so we don't need to worry about LRU statistics.
81 */
82static inline void unevictable_migrate_page(struct page *new, struct page *old)
83{
84 if (TestClearPageUnevictable(old))
85 SetPageUnevictable(new);
86}
Lee Schermerhorn894bc312008-10-18 20:26:39 -070087
David Howells33925b22009-03-31 15:23:26 -070088#ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT
Nick Pigginb291f002008-10-18 20:26:44 -070089/*
90 * Called only in fault path via page_evictable() for a new page
91 * to determine if it's being mapped into a LOCKED vma.
92 * If so, mark page as mlocked.
93 */
94static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page)
95{
96 VM_BUG_ON(PageLRU(page));
97
98 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
99 return 0;
100
Nick Piggin5344b7e2008-10-18 20:26:51 -0700101 if (!TestSetPageMlocked(page)) {
102 inc_zone_page_state(page, NR_MLOCK);
103 count_vm_event(UNEVICTABLE_PGMLOCKED);
104 }
Nick Pigginb291f002008-10-18 20:26:44 -0700105 return 1;
106}
107
108/*
109 * must be called with vma's mmap_sem held for read, and page locked.
110 */
111extern void mlock_vma_page(struct page *page);
112
113/*
114 * Clear the page's PageMlocked(). This can be useful in a situation where
115 * we want to unconditionally remove a page from the pagecache -- e.g.,
116 * on truncation or freeing.
117 *
118 * It is legal to call this function for any page, mlocked or not.
119 * If called for a page that is still mapped by mlocked vmas, all we do
120 * is revert to lazy LRU behaviour -- semantics are not broken.
121 */
122extern void __clear_page_mlock(struct page *page);
123static inline void clear_page_mlock(struct page *page)
124{
125 if (unlikely(TestClearPageMlocked(page)))
126 __clear_page_mlock(page);
127}
128
129/*
130 * mlock_migrate_page - called only from migrate_page_copy() to
Nick Piggin5344b7e2008-10-18 20:26:51 -0700131 * migrate the Mlocked page flag; update statistics.
Nick Pigginb291f002008-10-18 20:26:44 -0700132 */
133static inline void mlock_migrate_page(struct page *newpage, struct page *page)
134{
Nick Piggin5344b7e2008-10-18 20:26:51 -0700135 if (TestClearPageMlocked(page)) {
136 unsigned long flags;
137
138 local_irq_save(flags);
139 __dec_zone_page_state(page, NR_MLOCK);
Nick Pigginb291f002008-10-18 20:26:44 -0700140 SetPageMlocked(newpage);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700141 __inc_zone_page_state(newpage, NR_MLOCK);
142 local_irq_restore(flags);
143 }
Nick Pigginb291f002008-10-18 20:26:44 -0700144}
145
David Howells33925b22009-03-31 15:23:26 -0700146#else /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
Nick Pigginb291f002008-10-18 20:26:44 -0700147static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
148{
149 return 0;
150}
151static inline void clear_page_mlock(struct page *page) { }
152static inline void mlock_vma_page(struct page *page) { }
153static inline void mlock_migrate_page(struct page *new, struct page *old) { }
154
David Howells33925b22009-03-31 15:23:26 -0700155#endif /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
Lee Schermerhorn894bc312008-10-18 20:26:39 -0700156
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800157/*
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800158 * Return the mem_map entry representing the 'offset' subpage within
159 * the maximally aligned gigantic page 'base'. Handle any discontiguity
160 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
161 */
162static inline struct page *mem_map_offset(struct page *base, int offset)
163{
164 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
165 return pfn_to_page(page_to_pfn(base) + offset);
166 return base + offset;
167}
168
169/*
170 * Iterator over all subpages withing the maximally aligned gigantic
171 * page 'base'. Handle any discontiguity in the mem_map.
172 */
173static inline struct page *mem_map_next(struct page *iter,
174 struct page *base, int offset)
175{
176 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
177 unsigned long pfn = page_to_pfn(base) + offset;
178 if (!pfn_valid(pfn))
179 return NULL;
180 return pfn_to_page(pfn);
181 }
182 return iter + 1;
183}
184
185/*
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800186 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
187 * so all functions starting at paging_init should be marked __init
188 * in those cases. SPARSEMEM, however, allows for memory hotplug,
189 * and alloc_bootmem_node is not used.
190 */
191#ifdef CONFIG_SPARSEMEM
192#define __paginginit __meminit
193#else
194#define __paginginit __init
195#endif
196
Mel Gorman6b74ab92008-07-23 21:26:49 -0700197/* Memory initialisation debug and verification */
198enum mminit_level {
199 MMINIT_WARNING,
200 MMINIT_VERIFY,
201 MMINIT_TRACE
202};
203
204#ifdef CONFIG_DEBUG_MEMORY_INIT
205
206extern int mminit_loglevel;
207
208#define mminit_dprintk(level, prefix, fmt, arg...) \
209do { \
210 if (level < mminit_loglevel) { \
211 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
212 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
213 } \
214} while (0)
215
Mel Gorman708614e2008-07-23 21:26:51 -0700216extern void mminit_verify_pageflags_layout(void);
217extern void mminit_verify_page_links(struct page *page,
218 enum zone_type zone, unsigned long nid, unsigned long pfn);
Mel Gorman68ad8df2008-07-23 21:26:52 -0700219extern void mminit_verify_zonelist(void);
Mel Gorman708614e2008-07-23 21:26:51 -0700220
Mel Gorman6b74ab92008-07-23 21:26:49 -0700221#else
222
223static inline void mminit_dprintk(enum mminit_level level,
224 const char *prefix, const char *fmt, ...)
225{
226}
227
Mel Gorman708614e2008-07-23 21:26:51 -0700228static inline void mminit_verify_pageflags_layout(void)
229{
230}
231
232static inline void mminit_verify_page_links(struct page *page,
233 enum zone_type zone, unsigned long nid, unsigned long pfn)
234{
235}
Mel Gorman68ad8df2008-07-23 21:26:52 -0700236
237static inline void mminit_verify_zonelist(void)
238{
239}
Mel Gorman6b74ab92008-07-23 21:26:49 -0700240#endif /* CONFIG_DEBUG_MEMORY_INIT */
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700241
242/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
243#if defined(CONFIG_SPARSEMEM)
244extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
245 unsigned long *end_pfn);
246#else
247static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
248 unsigned long *end_pfn)
249{
250}
251#endif /* CONFIG_SPARSEMEM */
252
Nick Pigginb291f002008-10-18 20:26:44 -0700253#define GUP_FLAGS_WRITE 0x1
254#define GUP_FLAGS_FORCE 0x2
255#define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4
Ying Han47792802009-01-06 14:40:18 -0800256#define GUP_FLAGS_IGNORE_SIGKILL 0x8
Nick Pigginb291f002008-10-18 20:26:44 -0700257
258int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
259 unsigned long start, int len, int flags,
260 struct page **pages, struct vm_area_struct **vmas);
261
Mel Gormanfa5e0842009-06-16 15:33:22 -0700262#define ZONE_RECLAIM_NOSCAN -2
263#define ZONE_RECLAIM_FULL -1
264#define ZONE_RECLAIM_SOME 0
265#define ZONE_RECLAIM_SUCCESS 1
Nick Piggin0f8053a2006-03-22 00:08:33 -0800266#endif