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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
Andi Kleen01ad1c02008-07-23 21:27:46 -070019extern void prep_compound_page(struct page *page, unsigned long order);
Andy Whitcroft18229df2008-11-06 12:53:27 -080020extern void prep_compound_gigantic_page(struct page *page, unsigned long order);
Andi Kleen01ad1c02008-07-23 21:27:46 -070021
Nick Piggin7835e982006-03-22 00:08:40 -080022static inline void set_page_count(struct page *page, int v)
Nick Piggin77a8a782006-01-06 00:10:57 -080023{
Nick Piggin7835e982006-03-22 00:08:40 -080024 atomic_set(&page->_count, v);
25}
26
27/*
28 * Turn a non-refcounted page (->_count == 0) into refcounted with
29 * a count of one.
30 */
31static inline void set_page_refcounted(struct page *page)
32{
Qi Yongae1276b2008-02-04 22:29:27 -080033 VM_BUG_ON(PageTail(page));
Nick Piggin725d7042006-09-25 23:30:55 -070034 VM_BUG_ON(atomic_read(&page->_count));
Nick Piggin77a8a782006-01-06 00:10:57 -080035 set_page_count(page, 1);
Nick Piggin77a8a782006-01-06 00:10:57 -080036}
37
Nick Piggin0f8053a2006-03-22 00:08:33 -080038static inline void __put_page(struct page *page)
39{
40 atomic_dec(&page->_count);
41}
42
Lee Schermerhorn894bc312008-10-18 20:26:39 -070043/*
44 * in mm/vmscan.c:
45 */
Nick Piggin62695a82008-10-18 20:26:09 -070046extern int isolate_lru_page(struct page *page);
Lee Schermerhorn894bc312008-10-18 20:26:39 -070047extern void putback_lru_page(struct page *page);
Nick Piggin62695a82008-10-18 20:26:09 -070048
Lee Schermerhorn894bc312008-10-18 20:26:39 -070049/*
50 * in mm/page_alloc.c
51 */
Yasunori Goto0c0a4a52008-04-28 02:13:34 -070052extern void __free_pages_bootmem(struct page *page, unsigned int order);
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
Rik van Rielba470de2008-10-18 20:26:50 -070065extern long mlock_vma_pages_range(struct vm_area_struct *vma,
Nick Pigginb291f002008-10-18 20:26:44 -070066 unsigned long start, unsigned long end);
Rik van Rielba470de2008-10-18 20:26:50 -070067extern void munlock_vma_pages_range(struct vm_area_struct *vma,
68 unsigned long start, unsigned long end);
69static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
70{
71 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
72}
Nick Pigginb291f002008-10-18 20:26:44 -070073
Lee Schermerhorn894bc312008-10-18 20:26:39 -070074#ifdef CONFIG_UNEVICTABLE_LRU
75/*
76 * unevictable_migrate_page() called only from migrate_page_copy() to
77 * migrate unevictable flag to new page.
78 * Note that the old page has been isolated from the LRU lists at this
79 * point so we don't need to worry about LRU statistics.
80 */
81static inline void unevictable_migrate_page(struct page *new, struct page *old)
82{
83 if (TestClearPageUnevictable(old))
84 SetPageUnevictable(new);
85}
86#else
87static inline void unevictable_migrate_page(struct page *new, struct page *old)
88{
89}
90#endif
91
Nick Pigginb291f002008-10-18 20:26:44 -070092#ifdef CONFIG_UNEVICTABLE_LRU
93/*
94 * Called only in fault path via page_evictable() for a new page
95 * to determine if it's being mapped into a LOCKED vma.
96 * If so, mark page as mlocked.
97 */
98static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page)
99{
100 VM_BUG_ON(PageLRU(page));
101
102 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
103 return 0;
104
Nick Piggin5344b7e2008-10-18 20:26:51 -0700105 if (!TestSetPageMlocked(page)) {
106 inc_zone_page_state(page, NR_MLOCK);
107 count_vm_event(UNEVICTABLE_PGMLOCKED);
108 }
Nick Pigginb291f002008-10-18 20:26:44 -0700109 return 1;
110}
111
112/*
113 * must be called with vma's mmap_sem held for read, and page locked.
114 */
115extern void mlock_vma_page(struct page *page);
116
117/*
118 * Clear the page's PageMlocked(). This can be useful in a situation where
119 * we want to unconditionally remove a page from the pagecache -- e.g.,
120 * on truncation or freeing.
121 *
122 * It is legal to call this function for any page, mlocked or not.
123 * If called for a page that is still mapped by mlocked vmas, all we do
124 * is revert to lazy LRU behaviour -- semantics are not broken.
125 */
126extern void __clear_page_mlock(struct page *page);
127static inline void clear_page_mlock(struct page *page)
128{
129 if (unlikely(TestClearPageMlocked(page)))
130 __clear_page_mlock(page);
131}
132
133/*
134 * mlock_migrate_page - called only from migrate_page_copy() to
Nick Piggin5344b7e2008-10-18 20:26:51 -0700135 * migrate the Mlocked page flag; update statistics.
Nick Pigginb291f002008-10-18 20:26:44 -0700136 */
137static inline void mlock_migrate_page(struct page *newpage, struct page *page)
138{
Nick Piggin5344b7e2008-10-18 20:26:51 -0700139 if (TestClearPageMlocked(page)) {
140 unsigned long flags;
141
142 local_irq_save(flags);
143 __dec_zone_page_state(page, NR_MLOCK);
Nick Pigginb291f002008-10-18 20:26:44 -0700144 SetPageMlocked(newpage);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700145 __inc_zone_page_state(newpage, NR_MLOCK);
146 local_irq_restore(flags);
147 }
Nick Pigginb291f002008-10-18 20:26:44 -0700148}
149
Lee Schermerhorn985737c2008-10-18 20:26:53 -0700150/*
151 * free_page_mlock() -- clean up attempts to free and mlocked() page.
152 * Page should not be on lru, so no need to fix that up.
153 * free_pages_check() will verify...
154 */
155static inline void free_page_mlock(struct page *page)
156{
157 if (unlikely(TestClearPageMlocked(page))) {
158 unsigned long flags;
159
160 local_irq_save(flags);
161 __dec_zone_page_state(page, NR_MLOCK);
162 __count_vm_event(UNEVICTABLE_MLOCKFREED);
163 local_irq_restore(flags);
164 }
165}
Nick Pigginb291f002008-10-18 20:26:44 -0700166
167#else /* CONFIG_UNEVICTABLE_LRU */
168static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
169{
170 return 0;
171}
172static inline void clear_page_mlock(struct page *page) { }
173static inline void mlock_vma_page(struct page *page) { }
174static inline void mlock_migrate_page(struct page *new, struct page *old) { }
Lee Schermerhorn985737c2008-10-18 20:26:53 -0700175static inline void free_page_mlock(struct page *page) { }
Nick Pigginb291f002008-10-18 20:26:44 -0700176
177#endif /* CONFIG_UNEVICTABLE_LRU */
Lee Schermerhorn894bc312008-10-18 20:26:39 -0700178
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800179/*
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800180 * Return the mem_map entry representing the 'offset' subpage within
181 * the maximally aligned gigantic page 'base'. Handle any discontiguity
182 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
183 */
184static inline struct page *mem_map_offset(struct page *base, int offset)
185{
186 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
187 return pfn_to_page(page_to_pfn(base) + offset);
188 return base + offset;
189}
190
191/*
192 * Iterator over all subpages withing the maximally aligned gigantic
193 * page 'base'. Handle any discontiguity in the mem_map.
194 */
195static inline struct page *mem_map_next(struct page *iter,
196 struct page *base, int offset)
197{
198 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
199 unsigned long pfn = page_to_pfn(base) + offset;
200 if (!pfn_valid(pfn))
201 return NULL;
202 return pfn_to_page(pfn);
203 }
204 return iter + 1;
205}
206
207/*
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800208 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
209 * so all functions starting at paging_init should be marked __init
210 * in those cases. SPARSEMEM, however, allows for memory hotplug,
211 * and alloc_bootmem_node is not used.
212 */
213#ifdef CONFIG_SPARSEMEM
214#define __paginginit __meminit
215#else
216#define __paginginit __init
217#endif
218
Mel Gorman6b74ab92008-07-23 21:26:49 -0700219/* Memory initialisation debug and verification */
220enum mminit_level {
221 MMINIT_WARNING,
222 MMINIT_VERIFY,
223 MMINIT_TRACE
224};
225
226#ifdef CONFIG_DEBUG_MEMORY_INIT
227
228extern int mminit_loglevel;
229
230#define mminit_dprintk(level, prefix, fmt, arg...) \
231do { \
232 if (level < mminit_loglevel) { \
233 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
234 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
235 } \
236} while (0)
237
Mel Gorman708614e2008-07-23 21:26:51 -0700238extern void mminit_verify_pageflags_layout(void);
239extern void mminit_verify_page_links(struct page *page,
240 enum zone_type zone, unsigned long nid, unsigned long pfn);
Mel Gorman68ad8df2008-07-23 21:26:52 -0700241extern void mminit_verify_zonelist(void);
Mel Gorman708614e2008-07-23 21:26:51 -0700242
Mel Gorman6b74ab92008-07-23 21:26:49 -0700243#else
244
245static inline void mminit_dprintk(enum mminit_level level,
246 const char *prefix, const char *fmt, ...)
247{
248}
249
Mel Gorman708614e2008-07-23 21:26:51 -0700250static inline void mminit_verify_pageflags_layout(void)
251{
252}
253
254static inline void mminit_verify_page_links(struct page *page,
255 enum zone_type zone, unsigned long nid, unsigned long pfn)
256{
257}
Mel Gorman68ad8df2008-07-23 21:26:52 -0700258
259static inline void mminit_verify_zonelist(void)
260{
261}
Mel Gorman6b74ab92008-07-23 21:26:49 -0700262#endif /* CONFIG_DEBUG_MEMORY_INIT */
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700263
264/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
265#if defined(CONFIG_SPARSEMEM)
266extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
267 unsigned long *end_pfn);
268#else
269static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
270 unsigned long *end_pfn)
271{
272}
273#endif /* CONFIG_SPARSEMEM */
274
Nick Pigginb291f002008-10-18 20:26:44 -0700275#define GUP_FLAGS_WRITE 0x1
276#define GUP_FLAGS_FORCE 0x2
277#define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4
278
279int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
280 unsigned long start, int len, int flags,
281 struct page **pages, struct vm_area_struct **vmas);
282
Nick Piggin0f8053a2006-03-22 00:08:33 -0800283#endif