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