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1da177e4 LT |
1 | /* 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 | */ | |
0f8053a5 NP |
11 | #ifndef __MM_INTERNAL_H |
12 | #define __MM_INTERNAL_H | |
13 | ||
14 | #include <linux/mm.h> | |
1da177e4 | 15 | |
42b77728 JB |
16 | void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
17 | unsigned long floor, unsigned long ceiling); | |
18 | ||
01ad1c08 AK |
19 | extern void prep_compound_page(struct page *page, unsigned long order); |
20 | ||
7835e98b | 21 | static inline void set_page_count(struct page *page, int v) |
77a8a788 | 22 | { |
7835e98b NP |
23 | atomic_set(&page->_count, v); |
24 | } | |
25 | ||
26 | /* | |
27 | * Turn a non-refcounted page (->_count == 0) into refcounted with | |
28 | * a count of one. | |
29 | */ | |
30 | static inline void set_page_refcounted(struct page *page) | |
31 | { | |
ae1276b9 | 32 | VM_BUG_ON(PageTail(page)); |
725d704e | 33 | VM_BUG_ON(atomic_read(&page->_count)); |
77a8a788 | 34 | set_page_count(page, 1); |
77a8a788 NP |
35 | } |
36 | ||
0f8053a5 NP |
37 | static inline void __put_page(struct page *page) |
38 | { | |
39 | atomic_dec(&page->_count); | |
40 | } | |
41 | ||
894bc310 LS |
42 | /* |
43 | * in mm/vmscan.c: | |
44 | */ | |
62695a84 | 45 | extern int isolate_lru_page(struct page *page); |
894bc310 | 46 | extern void putback_lru_page(struct page *page); |
62695a84 | 47 | |
894bc310 LS |
48 | /* |
49 | * in mm/page_alloc.c | |
50 | */ | |
0c0a4a51 | 51 | extern void __free_pages_bootmem(struct page *page, unsigned int order); |
0f8053a5 | 52 | |
48f13bf3 MG |
53 | /* |
54 | * function for dealing with page's order in buddy system. | |
55 | * zone->lock is already acquired when we use these. | |
56 | * So, we don't need atomic page->flags operations here. | |
57 | */ | |
58 | static inline unsigned long page_order(struct page *page) | |
59 | { | |
60 | VM_BUG_ON(!PageBuddy(page)); | |
61 | return page_private(page); | |
62 | } | |
b5a0e011 | 63 | |
b291f000 NP |
64 | extern int mlock_vma_pages_range(struct vm_area_struct *vma, |
65 | unsigned long start, unsigned long end); | |
66 | extern void munlock_vma_pages_all(struct vm_area_struct *vma); | |
67 | ||
894bc310 LS |
68 | #ifdef CONFIG_UNEVICTABLE_LRU |
69 | /* | |
70 | * unevictable_migrate_page() called only from migrate_page_copy() to | |
71 | * migrate unevictable flag to new page. | |
72 | * Note that the old page has been isolated from the LRU lists at this | |
73 | * point so we don't need to worry about LRU statistics. | |
74 | */ | |
75 | static inline void unevictable_migrate_page(struct page *new, struct page *old) | |
76 | { | |
77 | if (TestClearPageUnevictable(old)) | |
78 | SetPageUnevictable(new); | |
79 | } | |
80 | #else | |
81 | static inline void unevictable_migrate_page(struct page *new, struct page *old) | |
82 | { | |
83 | } | |
84 | #endif | |
85 | ||
b291f000 NP |
86 | #ifdef CONFIG_UNEVICTABLE_LRU |
87 | /* | |
88 | * Called only in fault path via page_evictable() for a new page | |
89 | * to determine if it's being mapped into a LOCKED vma. | |
90 | * If so, mark page as mlocked. | |
91 | */ | |
92 | static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page) | |
93 | { | |
94 | VM_BUG_ON(PageLRU(page)); | |
95 | ||
96 | if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) | |
97 | return 0; | |
98 | ||
99 | SetPageMlocked(page); | |
100 | return 1; | |
101 | } | |
102 | ||
103 | /* | |
104 | * must be called with vma's mmap_sem held for read, and page locked. | |
105 | */ | |
106 | extern void mlock_vma_page(struct page *page); | |
107 | ||
108 | /* | |
109 | * Clear the page's PageMlocked(). This can be useful in a situation where | |
110 | * we want to unconditionally remove a page from the pagecache -- e.g., | |
111 | * on truncation or freeing. | |
112 | * | |
113 | * It is legal to call this function for any page, mlocked or not. | |
114 | * If called for a page that is still mapped by mlocked vmas, all we do | |
115 | * is revert to lazy LRU behaviour -- semantics are not broken. | |
116 | */ | |
117 | extern void __clear_page_mlock(struct page *page); | |
118 | static inline void clear_page_mlock(struct page *page) | |
119 | { | |
120 | if (unlikely(TestClearPageMlocked(page))) | |
121 | __clear_page_mlock(page); | |
122 | } | |
123 | ||
124 | /* | |
125 | * mlock_migrate_page - called only from migrate_page_copy() to | |
126 | * migrate the Mlocked page flag | |
127 | */ | |
128 | static inline void mlock_migrate_page(struct page *newpage, struct page *page) | |
129 | { | |
130 | if (TestClearPageMlocked(page)) | |
131 | SetPageMlocked(newpage); | |
132 | } | |
133 | ||
134 | ||
135 | #else /* CONFIG_UNEVICTABLE_LRU */ | |
136 | static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p) | |
137 | { | |
138 | return 0; | |
139 | } | |
140 | static inline void clear_page_mlock(struct page *page) { } | |
141 | static inline void mlock_vma_page(struct page *page) { } | |
142 | static inline void mlock_migrate_page(struct page *new, struct page *old) { } | |
143 | ||
144 | #endif /* CONFIG_UNEVICTABLE_LRU */ | |
894bc310 | 145 | |
b5a0e011 AH |
146 | /* |
147 | * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node, | |
148 | * so all functions starting at paging_init should be marked __init | |
149 | * in those cases. SPARSEMEM, however, allows for memory hotplug, | |
150 | * and alloc_bootmem_node is not used. | |
151 | */ | |
152 | #ifdef CONFIG_SPARSEMEM | |
153 | #define __paginginit __meminit | |
154 | #else | |
155 | #define __paginginit __init | |
156 | #endif | |
157 | ||
6b74ab97 MG |
158 | /* Memory initialisation debug and verification */ |
159 | enum mminit_level { | |
160 | MMINIT_WARNING, | |
161 | MMINIT_VERIFY, | |
162 | MMINIT_TRACE | |
163 | }; | |
164 | ||
165 | #ifdef CONFIG_DEBUG_MEMORY_INIT | |
166 | ||
167 | extern int mminit_loglevel; | |
168 | ||
169 | #define mminit_dprintk(level, prefix, fmt, arg...) \ | |
170 | do { \ | |
171 | if (level < mminit_loglevel) { \ | |
172 | printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \ | |
173 | printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \ | |
174 | } \ | |
175 | } while (0) | |
176 | ||
708614e6 MG |
177 | extern void mminit_verify_pageflags_layout(void); |
178 | extern void mminit_verify_page_links(struct page *page, | |
179 | enum zone_type zone, unsigned long nid, unsigned long pfn); | |
68ad8df4 | 180 | extern void mminit_verify_zonelist(void); |
708614e6 | 181 | |
6b74ab97 MG |
182 | #else |
183 | ||
184 | static inline void mminit_dprintk(enum mminit_level level, | |
185 | const char *prefix, const char *fmt, ...) | |
186 | { | |
187 | } | |
188 | ||
708614e6 MG |
189 | static inline void mminit_verify_pageflags_layout(void) |
190 | { | |
191 | } | |
192 | ||
193 | static inline void mminit_verify_page_links(struct page *page, | |
194 | enum zone_type zone, unsigned long nid, unsigned long pfn) | |
195 | { | |
196 | } | |
68ad8df4 MG |
197 | |
198 | static inline void mminit_verify_zonelist(void) | |
199 | { | |
200 | } | |
6b74ab97 | 201 | #endif /* CONFIG_DEBUG_MEMORY_INIT */ |
2dbb51c4 MG |
202 | |
203 | /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ | |
204 | #if defined(CONFIG_SPARSEMEM) | |
205 | extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
206 | unsigned long *end_pfn); | |
207 | #else | |
208 | static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, | |
209 | unsigned long *end_pfn) | |
210 | { | |
211 | } | |
212 | #endif /* CONFIG_SPARSEMEM */ | |
213 | ||
b291f000 NP |
214 | #define GUP_FLAGS_WRITE 0x1 |
215 | #define GUP_FLAGS_FORCE 0x2 | |
216 | #define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4 | |
217 | ||
218 | int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, | |
219 | unsigned long start, int len, int flags, | |
220 | struct page **pages, struct vm_area_struct **vmas); | |
221 | ||
0f8053a5 | 222 | #endif |