mm/internal.h

   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  */
  11 #ifndef __MM_INTERNAL_H
  12 #define __MM_INTERNAL_H
  13
  14 #include <linux/mm.h>
  15
  16 void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
  17                 unsigned long floor, unsigned long ceiling);
  18
  19 extern void prep_compound_page(struct page *page, unsigned long order);
  20
  21 static inline void set_page_count(struct page *page, int v)
  22 {
  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 {
  32         VM_BUG_ON(PageTail(page));
  33         VM_BUG_ON(atomic_read(&page->_count));
  34         set_page_count(page, 1);
  35 }
  36
  37 static inline void __put_page(struct page *page)
  38 {
  39         atomic_dec(&page->_count);
  40 }
  41
  42 extern int isolate_lru_page(struct page *page);
  43
  44 extern void __free_pages_bootmem(struct page *page, unsigned int order);
  45
  46 /*
  47  * function for dealing with page's order in buddy system.
  48  * zone->lock is already acquired when we use these.
  49  * So, we don't need atomic page->flags operations here.
  50  */
  51 static inline unsigned long page_order(struct page *page)
  52 {
  53         VM_BUG_ON(!PageBuddy(page));
  54         return page_private(page);
  55 }
  56
  57 /*
  58  * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
  59  * so all functions starting at paging_init should be marked __init
  60  * in those cases. SPARSEMEM, however, allows for memory hotplug,
  61  * and alloc_bootmem_node is not used.
  62  */
  63 #ifdef CONFIG_SPARSEMEM
  64 #define __paginginit __meminit
  65 #else
  66 #define __paginginit __init
  67 #endif
  68
  69 /* Memory initialisation debug and verification */
  70 enum mminit_level {
  71         MMINIT_WARNING,
  72         MMINIT_VERIFY,
  73         MMINIT_TRACE
  74 };
  75
  76 #ifdef CONFIG_DEBUG_MEMORY_INIT
  77
  78 extern int mminit_loglevel;
  79
  80 #define mminit_dprintk(level, prefix, fmt, arg...) \
  81 do { \
  82         if (level < mminit_loglevel) { \
  83                 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
  84                 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
  85         } \
  86 } while (0)
  87
  88 extern void mminit_verify_pageflags_layout(void);
  89 extern void mminit_verify_page_links(struct page *page,
  90                 enum zone_type zone, unsigned long nid, unsigned long pfn);
  91 extern void mminit_verify_zonelist(void);
  92
  93 #else
  94
  95 static inline void mminit_dprintk(enum mminit_level level,
  96                                 const char *prefix, const char *fmt, ...)
  97 {
  98 }
  99
 100 static inline void mminit_verify_pageflags_layout(void)
 101 {
 102 }
 103
 104 static inline void mminit_verify_page_links(struct page *page,
 105                 enum zone_type zone, unsigned long nid, unsigned long pfn)
 106 {
 107 }
 108
 109 static inline void mminit_verify_zonelist(void)
 110 {
 111 }
 112 #endif /* CONFIG_DEBUG_MEMORY_INIT */
 113
 114 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
 115 #if defined(CONFIG_SPARSEMEM)
 116 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
 117                                 unsigned long *end_pfn);
 118 #else
 119 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
 120                                 unsigned long *end_pfn)
 121 {
 122 }
 123 #endif /* CONFIG_SPARSEMEM */
 124
 125 #endif