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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
Hugh Dickins03f64622009-09-21 17:03:35 -070040extern unsigned long highest_memmap_pfn;
41
Lee Schermerhorn894bc312008-10-18 20:26:39 -070042/*
43 * in mm/vmscan.c:
44 */
Nick Piggin62695a82008-10-18 20:26:09 -070045extern int isolate_lru_page(struct page *page);
Lee Schermerhorn894bc312008-10-18 20:26:39 -070046extern void putback_lru_page(struct page *page);
Nick Piggin62695a82008-10-18 20:26:09 -070047
Lee Schermerhorn894bc312008-10-18 20:26:39 -070048/*
49 * in mm/page_alloc.c
50 */
Yasunori Goto0c0a4a52008-04-28 02:13:34 -070051extern void __free_pages_bootmem(struct page *page, unsigned int order);
Wu Fengguang20a03072009-06-16 15:32:22 -070052extern void prep_compound_page(struct page *page, unsigned long order);
53
Nick Piggin0f8053a2006-03-22 00:08:33 -080054
Mel Gorman48f13bf2007-10-16 01:26:10 -070055/*
56 * function for dealing with page's order in buddy system.
57 * zone->lock is already acquired when we use these.
58 * So, we don't need atomic page->flags operations here.
59 */
60static inline unsigned long page_order(struct page *page)
61{
62 VM_BUG_ON(!PageBuddy(page));
63 return page_private(page);
64}
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -080065
David Howells33925b22009-03-31 15:23:26 -070066#ifdef CONFIG_HAVE_MLOCK
Rik van Rielba470de2008-10-18 20:26:50 -070067extern long mlock_vma_pages_range(struct vm_area_struct *vma,
Nick Pigginb291f002008-10-18 20:26:44 -070068 unsigned long start, unsigned long end);
Rik van Rielba470de2008-10-18 20:26:50 -070069extern void munlock_vma_pages_range(struct vm_area_struct *vma,
70 unsigned long start, unsigned long end);
71static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
72{
73 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
74}
David Howells33925b22009-03-31 15:23:26 -070075#endif
Nick Pigginb291f002008-10-18 20:26:44 -070076
Lee Schermerhorn894bc312008-10-18 20:26:39 -070077/*
78 * unevictable_migrate_page() called only from migrate_page_copy() to
79 * migrate unevictable flag to new page.
80 * Note that the old page has been isolated from the LRU lists at this
81 * point so we don't need to worry about LRU statistics.
82 */
83static inline void unevictable_migrate_page(struct page *new, struct page *old)
84{
85 if (TestClearPageUnevictable(old))
86 SetPageUnevictable(new);
87}
Lee Schermerhorn894bc312008-10-18 20:26:39 -070088
David Howells33925b22009-03-31 15:23:26 -070089#ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT
Nick Pigginb291f002008-10-18 20:26:44 -070090/*
91 * Called only in fault path via page_evictable() for a new page
92 * to determine if it's being mapped into a LOCKED vma.
93 * If so, mark page as mlocked.
94 */
95static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page)
96{
97 VM_BUG_ON(PageLRU(page));
98
99 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
100 return 0;
101
Nick Piggin5344b7e2008-10-18 20:26:51 -0700102 if (!TestSetPageMlocked(page)) {
103 inc_zone_page_state(page, NR_MLOCK);
104 count_vm_event(UNEVICTABLE_PGMLOCKED);
105 }
Nick Pigginb291f002008-10-18 20:26:44 -0700106 return 1;
107}
108
109/*
Hugh Dickins8ac9e802009-12-30 23:00:30 +0000110 * must be called with vma's mmap_sem held for read or write, and page locked.
Nick Pigginb291f002008-10-18 20:26:44 -0700111 */
112extern void mlock_vma_page(struct page *page);
Hugh Dickins8ac9e802009-12-30 23:00:30 +0000113extern void munlock_vma_page(struct page *page);
Nick Pigginb291f002008-10-18 20:26:44 -0700114
115/*
116 * Clear the page's PageMlocked(). This can be useful in a situation where
117 * we want to unconditionally remove a page from the pagecache -- e.g.,
118 * on truncation or freeing.
119 *
120 * It is legal to call this function for any page, mlocked or not.
121 * If called for a page that is still mapped by mlocked vmas, all we do
122 * is revert to lazy LRU behaviour -- semantics are not broken.
123 */
124extern void __clear_page_mlock(struct page *page);
125static inline void clear_page_mlock(struct page *page)
126{
127 if (unlikely(TestClearPageMlocked(page)))
128 __clear_page_mlock(page);
129}
130
131/*
132 * mlock_migrate_page - called only from migrate_page_copy() to
Nick Piggin5344b7e2008-10-18 20:26:51 -0700133 * migrate the Mlocked page flag; update statistics.
Nick Pigginb291f002008-10-18 20:26:44 -0700134 */
135static inline void mlock_migrate_page(struct page *newpage, struct page *page)
136{
Nick Piggin5344b7e2008-10-18 20:26:51 -0700137 if (TestClearPageMlocked(page)) {
138 unsigned long flags;
139
140 local_irq_save(flags);
141 __dec_zone_page_state(page, NR_MLOCK);
Nick Pigginb291f002008-10-18 20:26:44 -0700142 SetPageMlocked(newpage);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700143 __inc_zone_page_state(newpage, NR_MLOCK);
144 local_irq_restore(flags);
145 }
Nick Pigginb291f002008-10-18 20:26:44 -0700146}
147
David Howells33925b22009-03-31 15:23:26 -0700148#else /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
Nick Pigginb291f002008-10-18 20:26:44 -0700149static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
150{
151 return 0;
152}
153static inline void clear_page_mlock(struct page *page) { }
154static inline void mlock_vma_page(struct page *page) { }
155static inline void mlock_migrate_page(struct page *new, struct page *old) { }
156
David Howells33925b22009-03-31 15:23:26 -0700157#endif /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
Lee Schermerhorn894bc312008-10-18 20:26:39 -0700158
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800159/*
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800160 * Return the mem_map entry representing the 'offset' subpage within
161 * the maximally aligned gigantic page 'base'. Handle any discontiguity
162 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
163 */
164static inline struct page *mem_map_offset(struct page *base, int offset)
165{
166 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
167 return pfn_to_page(page_to_pfn(base) + offset);
168 return base + offset;
169}
170
171/*
172 * Iterator over all subpages withing the maximally aligned gigantic
173 * page 'base'. Handle any discontiguity in the mem_map.
174 */
175static inline struct page *mem_map_next(struct page *iter,
176 struct page *base, int offset)
177{
178 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
179 unsigned long pfn = page_to_pfn(base) + offset;
180 if (!pfn_valid(pfn))
181 return NULL;
182 return pfn_to_page(pfn);
183 }
184 return iter + 1;
185}
186
187/*
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800188 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
189 * so all functions starting at paging_init should be marked __init
190 * in those cases. SPARSEMEM, however, allows for memory hotplug,
191 * and alloc_bootmem_node is not used.
192 */
193#ifdef CONFIG_SPARSEMEM
194#define __paginginit __meminit
195#else
196#define __paginginit __init
197#endif
198
Mel Gorman6b74ab92008-07-23 21:26:49 -0700199/* Memory initialisation debug and verification */
200enum mminit_level {
201 MMINIT_WARNING,
202 MMINIT_VERIFY,
203 MMINIT_TRACE
204};
205
206#ifdef CONFIG_DEBUG_MEMORY_INIT
207
208extern int mminit_loglevel;
209
210#define mminit_dprintk(level, prefix, fmt, arg...) \
211do { \
212 if (level < mminit_loglevel) { \
213 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
214 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
215 } \
216} while (0)
217
Mel Gorman708614e2008-07-23 21:26:51 -0700218extern void mminit_verify_pageflags_layout(void);
219extern void mminit_verify_page_links(struct page *page,
220 enum zone_type zone, unsigned long nid, unsigned long pfn);
Mel Gorman68ad8df2008-07-23 21:26:52 -0700221extern void mminit_verify_zonelist(void);
Mel Gorman708614e2008-07-23 21:26:51 -0700222
Mel Gorman6b74ab92008-07-23 21:26:49 -0700223#else
224
225static inline void mminit_dprintk(enum mminit_level level,
226 const char *prefix, const char *fmt, ...)
227{
228}
229
Mel Gorman708614e2008-07-23 21:26:51 -0700230static inline void mminit_verify_pageflags_layout(void)
231{
232}
233
234static inline void mminit_verify_page_links(struct page *page,
235 enum zone_type zone, unsigned long nid, unsigned long pfn)
236{
237}
Mel Gorman68ad8df2008-07-23 21:26:52 -0700238
239static inline void mminit_verify_zonelist(void)
240{
241}
Mel Gorman6b74ab92008-07-23 21:26:49 -0700242#endif /* CONFIG_DEBUG_MEMORY_INIT */
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700243
244/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
245#if defined(CONFIG_SPARSEMEM)
246extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
247 unsigned long *end_pfn);
248#else
249static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
250 unsigned long *end_pfn)
251{
252}
253#endif /* CONFIG_SPARSEMEM */
254
Nick Pigginb291f002008-10-18 20:26:44 -0700255int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
Hugh Dickins58fa8792009-09-21 17:03:31 -0700256 unsigned long start, int len, unsigned int foll_flags,
Nick Pigginb291f002008-10-18 20:26:44 -0700257 struct page **pages, struct vm_area_struct **vmas);
258
Mel Gormanfa5e0842009-06-16 15:33:22 -0700259#define ZONE_RECLAIM_NOSCAN -2
260#define ZONE_RECLAIM_FULL -1
261#define ZONE_RECLAIM_SOME 0
262#define ZONE_RECLAIM_SUCCESS 1
Nick Piggin0f8053a2006-03-22 00:08:33 -0800263#endif