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 static inline void set_page_count(struct page *page, int v)
  20 {
  21         atomic_set(&page->_count, v);
  22 }
  23
  24 /*
  25  * Turn a non-refcounted page (->_count == 0) into refcounted with
  26  * a count of one.
  27  */
  28 static inline void set_page_refcounted(struct page *page)
  29 {
  30         VM_BUG_ON(PageTail(page));
  31         VM_BUG_ON(atomic_read(&page->_count));
  32         set_page_count(page, 1);
  33 }
  34
  35 static inline void __put_page(struct page *page)
  36 {
  37         atomic_dec(&page->_count);
  38 }
  39
  40 extern void __free_pages_bootmem(struct page *page, unsigned int order);
  41
  42 /*
  43  * function for dealing with page's order in buddy system.
  44  * zone->lock is already acquired when we use these.
  45  * So, we don't need atomic page->flags operations here.
  46  */
  47 static inline unsigned long page_order(struct page *page)
  48 {
  49         VM_BUG_ON(!PageBuddy(page));
  50         return page_private(page);
  51 }
  52
  53 /*
  54  * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
  55  * so all functions starting at paging_init should be marked __init
  56  * in those cases. SPARSEMEM, however, allows for memory hotplug,
  57  * and alloc_bootmem_node is not used.
  58  */
  59 #ifdef CONFIG_SPARSEMEM
  60 #define __paginginit __meminit
  61 #else
  62 #define __paginginit __init
  63 #endif
  64
  65 /* Memory initialisation debug and verification */
  66 enum mminit_level {
  67         MMINIT_WARNING,
  68         MMINIT_VERIFY,
  69         MMINIT_TRACE
  70 };
  71
  72 #ifdef CONFIG_DEBUG_MEMORY_INIT
  73
  74 extern int mminit_loglevel;
  75
  76 #define mminit_dprintk(level, prefix, fmt, arg...) \
  77 do { \
  78         if (level < mminit_loglevel) { \
  79                 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
  80                 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
  81         } \
  82 } while (0)
  83
  84 extern void mminit_verify_pageflags_layout(void);
  85 extern void mminit_verify_page_links(struct page *page,
  86                 enum zone_type zone, unsigned long nid, unsigned long pfn);
  87 extern void mminit_verify_zonelist(void);
  88
  89 #else
  90
  91 static inline void mminit_dprintk(enum mminit_level level,
  92                                 const char *prefix, const char *fmt, ...)
  93 {
  94 }
  95
  96 static inline void mminit_verify_pageflags_layout(void)
  97 {
  98 }
  99
 100 static inline void mminit_verify_page_links(struct page *page,
 101                 enum zone_type zone, unsigned long nid, unsigned long pfn)
 102 {
 103 }
 104
 105 static inline void mminit_verify_zonelist(void)
 106 {
 107 }
 108 #endif /* CONFIG_DEBUG_MEMORY_INIT */
 109
 110 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
 111 #if defined(CONFIG_SPARSEMEM)
 112 extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
 113                                 unsigned long *end_pfn);
 114 #else
 115 static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
 116                                 unsigned long *end_pfn)
 117 {
 118 }
 119 #endif /* CONFIG_SPARSEMEM */
 120
 121 #endif