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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 */
Hugh Dickins22b31ee2009-01-06 14:40:09 -080052extern unsigned long highest_memmap_pfn;
Yasunori Goto0c0a4a52008-04-28 02:13:34 -070053extern void __free_pages_bootmem(struct page *page, unsigned int order);
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#ifdef CONFIG_UNEVICTABLE_LRU
78/*
79 * unevictable_migrate_page() called only from migrate_page_copy() to
80 * migrate unevictable flag to new page.
81 * Note that the old page has been isolated from the LRU lists at this
82 * point so we don't need to worry about LRU statistics.
83 */
84static inline void unevictable_migrate_page(struct page *new, struct page *old)
85{
86 if (TestClearPageUnevictable(old))
87 SetPageUnevictable(new);
88}
89#else
90static inline void unevictable_migrate_page(struct page *new, struct page *old)
91{
92}
93#endif
94
David Howells33925b22009-03-31 15:23:26 -070095#ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT
Nick Pigginb291f002008-10-18 20:26:44 -070096/*
97 * Called only in fault path via page_evictable() for a new page
98 * to determine if it's being mapped into a LOCKED vma.
99 * If so, mark page as mlocked.
100 */
101static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page)
102{
103 VM_BUG_ON(PageLRU(page));
104
105 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
106 return 0;
107
Nick Piggin5344b7e2008-10-18 20:26:51 -0700108 if (!TestSetPageMlocked(page)) {
109 inc_zone_page_state(page, NR_MLOCK);
110 count_vm_event(UNEVICTABLE_PGMLOCKED);
111 }
Nick Pigginb291f002008-10-18 20:26:44 -0700112 return 1;
113}
114
115/*
116 * must be called with vma's mmap_sem held for read, and page locked.
117 */
118extern void mlock_vma_page(struct page *page);
119
120/*
121 * Clear the page's PageMlocked(). This can be useful in a situation where
122 * we want to unconditionally remove a page from the pagecache -- e.g.,
123 * on truncation or freeing.
124 *
125 * It is legal to call this function for any page, mlocked or not.
126 * If called for a page that is still mapped by mlocked vmas, all we do
127 * is revert to lazy LRU behaviour -- semantics are not broken.
128 */
129extern void __clear_page_mlock(struct page *page);
130static inline void clear_page_mlock(struct page *page)
131{
132 if (unlikely(TestClearPageMlocked(page)))
133 __clear_page_mlock(page);
134}
135
136/*
137 * mlock_migrate_page - called only from migrate_page_copy() to
Nick Piggin5344b7e2008-10-18 20:26:51 -0700138 * migrate the Mlocked page flag; update statistics.
Nick Pigginb291f002008-10-18 20:26:44 -0700139 */
140static inline void mlock_migrate_page(struct page *newpage, struct page *page)
141{
Nick Piggin5344b7e2008-10-18 20:26:51 -0700142 if (TestClearPageMlocked(page)) {
143 unsigned long flags;
144
145 local_irq_save(flags);
146 __dec_zone_page_state(page, NR_MLOCK);
Nick Pigginb291f002008-10-18 20:26:44 -0700147 SetPageMlocked(newpage);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700148 __inc_zone_page_state(newpage, NR_MLOCK);
149 local_irq_restore(flags);
150 }
Nick Pigginb291f002008-10-18 20:26:44 -0700151}
152
David Howells33925b22009-03-31 15:23:26 -0700153#else /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
Nick Pigginb291f002008-10-18 20:26:44 -0700154static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
155{
156 return 0;
157}
158static inline void clear_page_mlock(struct page *page) { }
159static inline void mlock_vma_page(struct page *page) { }
160static inline void mlock_migrate_page(struct page *new, struct page *old) { }
161
David Howells33925b22009-03-31 15:23:26 -0700162#endif /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
Lee Schermerhorn894bc312008-10-18 20:26:39 -0700163
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800164/*
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800165 * Return the mem_map entry representing the 'offset' subpage within
166 * the maximally aligned gigantic page 'base'. Handle any discontiguity
167 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
168 */
169static inline struct page *mem_map_offset(struct page *base, int offset)
170{
171 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
172 return pfn_to_page(page_to_pfn(base) + offset);
173 return base + offset;
174}
175
176/*
177 * Iterator over all subpages withing the maximally aligned gigantic
178 * page 'base'. Handle any discontiguity in the mem_map.
179 */
180static inline struct page *mem_map_next(struct page *iter,
181 struct page *base, int offset)
182{
183 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
184 unsigned long pfn = page_to_pfn(base) + offset;
185 if (!pfn_valid(pfn))
186 return NULL;
187 return pfn_to_page(pfn);
188 }
189 return iter + 1;
190}
191
192/*
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800193 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
194 * so all functions starting at paging_init should be marked __init
195 * in those cases. SPARSEMEM, however, allows for memory hotplug,
196 * and alloc_bootmem_node is not used.
197 */
198#ifdef CONFIG_SPARSEMEM
199#define __paginginit __meminit
200#else
201#define __paginginit __init
202#endif
203
Mel Gorman6b74ab92008-07-23 21:26:49 -0700204/* Memory initialisation debug and verification */
205enum mminit_level {
206 MMINIT_WARNING,
207 MMINIT_VERIFY,
208 MMINIT_TRACE
209};
210
211#ifdef CONFIG_DEBUG_MEMORY_INIT
212
213extern int mminit_loglevel;
214
215#define mminit_dprintk(level, prefix, fmt, arg...) \
216do { \
217 if (level < mminit_loglevel) { \
218 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
219 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
220 } \
221} while (0)
222
Mel Gorman708614e2008-07-23 21:26:51 -0700223extern void mminit_verify_pageflags_layout(void);
224extern void mminit_verify_page_links(struct page *page,
225 enum zone_type zone, unsigned long nid, unsigned long pfn);
Mel Gorman68ad8df2008-07-23 21:26:52 -0700226extern void mminit_verify_zonelist(void);
Mel Gorman708614e2008-07-23 21:26:51 -0700227
Mel Gorman6b74ab92008-07-23 21:26:49 -0700228#else
229
230static inline void mminit_dprintk(enum mminit_level level,
231 const char *prefix, const char *fmt, ...)
232{
233}
234
Mel Gorman708614e2008-07-23 21:26:51 -0700235static inline void mminit_verify_pageflags_layout(void)
236{
237}
238
239static inline void mminit_verify_page_links(struct page *page,
240 enum zone_type zone, unsigned long nid, unsigned long pfn)
241{
242}
Mel Gorman68ad8df2008-07-23 21:26:52 -0700243
244static inline void mminit_verify_zonelist(void)
245{
246}
Mel Gorman6b74ab92008-07-23 21:26:49 -0700247#endif /* CONFIG_DEBUG_MEMORY_INIT */
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700248
249/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
250#if defined(CONFIG_SPARSEMEM)
251extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
252 unsigned long *end_pfn);
253#else
254static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
255 unsigned long *end_pfn)
256{
257}
258#endif /* CONFIG_SPARSEMEM */
259
Nick Pigginb291f002008-10-18 20:26:44 -0700260#define GUP_FLAGS_WRITE 0x1
261#define GUP_FLAGS_FORCE 0x2
262#define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4
Ying Han47792802009-01-06 14:40:18 -0800263#define GUP_FLAGS_IGNORE_SIGKILL 0x8
Nick Pigginb291f002008-10-18 20:26:44 -0700264
265int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
266 unsigned long start, int len, int flags,
267 struct page **pages, struct vm_area_struct **vmas);
268
Nick Piggin0f8053a2006-03-22 00:08:33 -0800269#endif