1 /* internal.h: mm/ internal definitions
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
11 #ifndef __MM_INTERNAL_H
12 #define __MM_INTERNAL_H
16 void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
17 unsigned long floor, unsigned long ceiling);
19 extern void prep_compound_page(struct page *page, unsigned long order);
21 static inline void set_page_count(struct page *page, int v)
23 atomic_set(&page->_count, v);
27 * Turn a non-refcounted page (->_count == 0) into refcounted with
30 static inline void set_page_refcounted(struct page *page)
32 VM_BUG_ON(PageTail(page));
33 VM_BUG_ON(atomic_read(&page->_count));
34 set_page_count(page, 1);
37 static inline void __put_page(struct page *page)
39 atomic_dec(&page->_count);
45 extern int isolate_lru_page(struct page *page);
46 extern void putback_lru_page(struct page *page);
51 extern void __free_pages_bootmem(struct page *page, unsigned int order);
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.
58 static inline unsigned long page_order(struct page *page)
60 VM_BUG_ON(!PageBuddy(page));
61 return page_private(page);
64 extern long mlock_vma_pages_range(struct vm_area_struct *vma,
65 unsigned long start, unsigned long end);
66 extern void munlock_vma_pages_range(struct vm_area_struct *vma,
67 unsigned long start, unsigned long end);
68 static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
70 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
73 #ifdef CONFIG_UNEVICTABLE_LRU
75 * unevictable_migrate_page() called only from migrate_page_copy() to
76 * migrate unevictable flag to new page.
77 * Note that the old page has been isolated from the LRU lists at this
78 * point so we don't need to worry about LRU statistics.
80 static inline void unevictable_migrate_page(struct page *new, struct page *old)
82 if (TestClearPageUnevictable(old))
83 SetPageUnevictable(new);
86 static inline void unevictable_migrate_page(struct page *new, struct page *old)
91 #ifdef CONFIG_UNEVICTABLE_LRU
93 * Called only in fault path via page_evictable() for a new page
94 * to determine if it's being mapped into a LOCKED vma.
95 * If so, mark page as mlocked.
97 static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page)
99 VM_BUG_ON(PageLRU(page));
101 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
104 if (!TestSetPageMlocked(page)) {
105 inc_zone_page_state(page, NR_MLOCK);
106 count_vm_event(UNEVICTABLE_PGMLOCKED);
112 * must be called with vma's mmap_sem held for read, and page locked.
114 extern void mlock_vma_page(struct page *page);
117 * Clear the page's PageMlocked(). This can be useful in a situation where
118 * we want to unconditionally remove a page from the pagecache -- e.g.,
119 * on truncation or freeing.
121 * It is legal to call this function for any page, mlocked or not.
122 * If called for a page that is still mapped by mlocked vmas, all we do
123 * is revert to lazy LRU behaviour -- semantics are not broken.
125 extern void __clear_page_mlock(struct page *page);
126 static inline void clear_page_mlock(struct page *page)
128 if (unlikely(TestClearPageMlocked(page)))
129 __clear_page_mlock(page);
133 * mlock_migrate_page - called only from migrate_page_copy() to
134 * migrate the Mlocked page flag; update statistics.
136 static inline void mlock_migrate_page(struct page *newpage, struct page *page)
138 if (TestClearPageMlocked(page)) {
141 local_irq_save(flags);
142 __dec_zone_page_state(page, NR_MLOCK);
143 SetPageMlocked(newpage);
144 __inc_zone_page_state(newpage, NR_MLOCK);
145 local_irq_restore(flags);
150 #else /* CONFIG_UNEVICTABLE_LRU */
151 static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
155 static inline void clear_page_mlock(struct page *page) { }
156 static inline void mlock_vma_page(struct page *page) { }
157 static inline void mlock_migrate_page(struct page *new, struct page *old) { }
159 #endif /* CONFIG_UNEVICTABLE_LRU */
162 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
163 * so all functions starting at paging_init should be marked __init
164 * in those cases. SPARSEMEM, however, allows for memory hotplug,
165 * and alloc_bootmem_node is not used.
167 #ifdef CONFIG_SPARSEMEM
168 #define __paginginit __meminit
170 #define __paginginit __init
173 /* Memory initialisation debug and verification */
180 #ifdef CONFIG_DEBUG_MEMORY_INIT
182 extern int mminit_loglevel;
184 #define mminit_dprintk(level, prefix, fmt, arg...) \
186 if (level < mminit_loglevel) { \
187 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
188 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
192 extern void mminit_verify_pageflags_layout(void);
193 extern void mminit_verify_page_links(struct page *page,
194 enum zone_type zone, unsigned long nid, unsigned long pfn);
195 extern void mminit_verify_zonelist(void);
199 static inline void mminit_dprintk(enum mminit_level level,
200 const char *prefix, const char *fmt, ...)
204 static inline void mminit_verify_pageflags_layout(void)
208 static inline void mminit_verify_page_links(struct page *page,
209 enum zone_type zone, unsigned long nid, unsigned long pfn)
213 static inline void mminit_verify_zonelist(void)
216 #endif /* CONFIG_DEBUG_MEMORY_INIT */
218 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
219 #if defined(CONFIG_SPARSEMEM)
220 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
221 unsigned long *end_pfn);
223 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
224 unsigned long *end_pfn)
227 #endif /* CONFIG_SPARSEMEM */
229 #define GUP_FLAGS_WRITE 0x1
230 #define GUP_FLAGS_FORCE 0x2
231 #define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4
233 int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
234 unsigned long start, int len, int flags,
235 struct page **pages, struct vm_area_struct **vmas);