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 #include <linux/config.h> 8 9 struct vm_area_struct; 10 11 /* 12 * GFP bitmasks.. 13 */ 14 /* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low two bits) */ 15 #define __GFP_DMA ((__force gfp_t)0x01u) 16 #define __GFP_HIGHMEM ((__force gfp_t)0x02u) 17 18 /* 19 * Action modifiers - doesn't change the zoning 20 * 21 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt 22 * _might_ fail. This depends upon the particular VM implementation. 23 * 24 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller 25 * cannot handle allocation failures. 26 * 27 * __GFP_NORETRY: The VM implementation must not retry indefinitely. 28 */ 29 #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */ 30 #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */ 31 #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */ 32 #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */ 33 #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */ 34 #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */ 35 #define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */ 36 #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */ 37 #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */ 38 #define __GFP_NO_GROW ((__force gfp_t)0x2000u)/* Slab internal usage */ 39 #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */ 40 #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */ 41 #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */ 42 #define __GFP_NORECLAIM ((__force gfp_t)0x20000u) /* No realy zone reclaim during allocation */ 43 #define __GFP_HARDWALL ((__force gfp_t)0x40000u) /* Enforce hardwall cpuset memory allocs */ 44 45 #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */ 46 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) 47 48 /* if you forget to add the bitmask here kernel will crash, period */ 49 #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \ 50 __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \ 51 __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \ 52 __GFP_NOMEMALLOC|__GFP_NORECLAIM|__GFP_HARDWALL) 53 54 #define GFP_ATOMIC (__GFP_HIGH) 55 #define GFP_NOIO (__GFP_WAIT) 56 #define GFP_NOFS (__GFP_WAIT | __GFP_IO) 57 #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) 58 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) 59 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ 60 __GFP_HIGHMEM) 61 62 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some 63 platforms, used as appropriate on others */ 64 65 #define GFP_DMA __GFP_DMA 66 67 #define gfp_zone(mask) ((__force int)((mask) & (__force gfp_t)GFP_ZONEMASK)) 68 69 /* 70 * There is only one page-allocator function, and two main namespaces to 71 * it. The alloc_page*() variants return 'struct page *' and as such 72 * can allocate highmem pages, the *get*page*() variants return 73 * virtual kernel addresses to the allocated page(s). 74 */ 75 76 /* 77 * We get the zone list from the current node and the gfp_mask. 78 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. 79 * 80 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets 81 * optimized to &contig_page_data at compile-time. 82 */ 83 84 #ifndef HAVE_ARCH_FREE_PAGE 85 static inline void arch_free_page(struct page *page, int order) { } 86 #endif 87 88 extern struct page * 89 FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *)); 90 91 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, 92 unsigned int order) 93 { 94 if (unlikely(order >= MAX_ORDER)) 95 return NULL; 96 97 return __alloc_pages(gfp_mask, order, 98 NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask)); 99 } 100 101 #ifdef CONFIG_NUMA 102 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); 103 104 static inline struct page * 105 alloc_pages(gfp_t gfp_mask, unsigned int order) 106 { 107 if (unlikely(order >= MAX_ORDER)) 108 return NULL; 109 110 return alloc_pages_current(gfp_mask, order); 111 } 112 extern struct page *alloc_page_vma(gfp_t gfp_mask, 113 struct vm_area_struct *vma, unsigned long addr); 114 #else 115 #define alloc_pages(gfp_mask, order) \ 116 alloc_pages_node(numa_node_id(), gfp_mask, order) 117 #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) 118 #endif 119 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) 120 121 extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order)); 122 extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask)); 123 124 #define __get_free_page(gfp_mask) \ 125 __get_free_pages((gfp_mask),0) 126 127 #define __get_dma_pages(gfp_mask, order) \ 128 __get_free_pages((gfp_mask) | GFP_DMA,(order)) 129 130 extern void FASTCALL(__free_pages(struct page *page, unsigned int order)); 131 extern void FASTCALL(free_pages(unsigned long addr, unsigned int order)); 132 extern void FASTCALL(free_hot_page(struct page *page)); 133 extern void FASTCALL(free_cold_page(struct page *page)); 134 135 #define __free_page(page) __free_pages((page), 0) 136 #define free_page(addr) free_pages((addr),0) 137 138 void page_alloc_init(void); 139 #ifdef CONFIG_NUMA 140 void drain_remote_pages(void); 141 #else 142 static inline void drain_remote_pages(void) { }; 143 #endif 144 145 #endif /* __LINUX_GFP_H */ 146