1 #ifndef __LINUX_GFP_H 2 #define __LINUX_GFP_H 3 4 #include <linux/mmzone.h> 5 #include <linux/stddef.h> 6 #include <linux/linkage.h> 7 8 struct vm_area_struct; 9 10 /* 11 * GFP bitmasks.. 12 * 13 * Zone modifiers (see linux/mmzone.h - low three bits) 14 * 15 * Do not put any conditional on these. If necessary modify the definitions 16 * without the underscores and use the consistently. The definitions here may 17 * be used in bit comparisons. 18 */ 19 #define __GFP_DMA ((__force gfp_t)0x01u) 20 #define __GFP_HIGHMEM ((__force gfp_t)0x02u) 21 #define __GFP_DMA32 ((__force gfp_t)0x04u) 22 23 /* 24 * Action modifiers - doesn't change the zoning 25 * 26 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt 27 * _might_ fail. This depends upon the particular VM implementation. 28 * 29 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller 30 * cannot handle allocation failures. 31 * 32 * __GFP_NORETRY: The VM implementation must not retry indefinitely. 33 */ 34 #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */ 35 #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */ 36 #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */ 37 #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */ 38 #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */ 39 #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */ 40 #define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */ 41 #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */ 42 #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */ 43 #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */ 44 #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */ 45 #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */ 46 #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */ 47 #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */ 48 49 #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */ 50 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) 51 52 /* if you forget to add the bitmask here kernel will crash, period */ 53 #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \ 54 __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \ 55 __GFP_NOFAIL|__GFP_NORETRY|__GFP_COMP| \ 56 __GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_THISNODE) 57 58 /* This equals 0, but use constants in case they ever change */ 59 #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) 60 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ 61 #define GFP_ATOMIC (__GFP_HIGH) 62 #define GFP_NOIO (__GFP_WAIT) 63 #define GFP_NOFS (__GFP_WAIT | __GFP_IO) 64 #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) 65 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) 66 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ 67 __GFP_HIGHMEM) 68 69 #ifdef CONFIG_NUMA 70 #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) 71 #else 72 #define GFP_THISNODE ((__force gfp_t)0) 73 #endif 74 75 76 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some 77 platforms, used as appropriate on others */ 78 79 #define GFP_DMA __GFP_DMA 80 81 /* 4GB DMA on some platforms */ 82 #define GFP_DMA32 __GFP_DMA32 83 84 85 static inline enum zone_type gfp_zone(gfp_t flags) 86 { 87 #ifdef CONFIG_ZONE_DMA 88 if (flags & __GFP_DMA) 89 return ZONE_DMA; 90 #endif 91 #ifdef CONFIG_ZONE_DMA32 92 if (flags & __GFP_DMA32) 93 return ZONE_DMA32; 94 #endif 95 #ifdef CONFIG_HIGHMEM 96 if (flags & __GFP_HIGHMEM) 97 return ZONE_HIGHMEM; 98 #endif 99 return ZONE_NORMAL; 100 } 101 102 /* 103 * There is only one page-allocator function, and two main namespaces to 104 * it. The alloc_page*() variants return 'struct page *' and as such 105 * can allocate highmem pages, the *get*page*() variants return 106 * virtual kernel addresses to the allocated page(s). 107 */ 108 109 /* 110 * We get the zone list from the current node and the gfp_mask. 111 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. 112 * 113 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets 114 * optimized to &contig_page_data at compile-time. 115 */ 116 117 #ifndef HAVE_ARCH_FREE_PAGE 118 static inline void arch_free_page(struct page *page, int order) { } 119 #endif 120 #ifndef HAVE_ARCH_ALLOC_PAGE 121 static inline void arch_alloc_page(struct page *page, int order) { } 122 #endif 123 124 extern struct page * 125 FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *)); 126 127 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, 128 unsigned int order) 129 { 130 if (unlikely(order >= MAX_ORDER)) 131 return NULL; 132 133 /* Unknown node is current node */ 134 if (nid < 0) 135 nid = numa_node_id(); 136 137 return __alloc_pages(gfp_mask, order, 138 NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask)); 139 } 140 141 #ifdef CONFIG_NUMA 142 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); 143 144 static inline struct page * 145 alloc_pages(gfp_t gfp_mask, unsigned int order) 146 { 147 if (unlikely(order >= MAX_ORDER)) 148 return NULL; 149 150 return alloc_pages_current(gfp_mask, order); 151 } 152 extern struct page *alloc_page_vma(gfp_t gfp_mask, 153 struct vm_area_struct *vma, unsigned long addr); 154 #else 155 #define alloc_pages(gfp_mask, order) \ 156 alloc_pages_node(numa_node_id(), gfp_mask, order) 157 #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) 158 #endif 159 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) 160 161 extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order)); 162 extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask)); 163 164 #define __get_free_page(gfp_mask) \ 165 __get_free_pages((gfp_mask),0) 166 167 #define __get_dma_pages(gfp_mask, order) \ 168 __get_free_pages((gfp_mask) | GFP_DMA,(order)) 169 170 extern void FASTCALL(__free_pages(struct page *page, unsigned int order)); 171 extern void FASTCALL(free_pages(unsigned long addr, unsigned int order)); 172 extern void FASTCALL(free_hot_page(struct page *page)); 173 extern void FASTCALL(free_cold_page(struct page *page)); 174 175 #define __free_page(page) __free_pages((page), 0) 176 #define free_page(addr) free_pages((addr),0) 177 178 void page_alloc_init(void); 179 #ifdef CONFIG_NUMA 180 void drain_node_pages(int node); 181 #else 182 static inline void drain_node_pages(int node) { }; 183 #endif 184 185 #endif /* __LINUX_GFP_H */ 186