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1da177e4 LT |
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 | */ | |
ac3461ad | 14 | /* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low three bits) */ |
af4ca457 AV |
15 | #define __GFP_DMA ((__force gfp_t)0x01u) |
16 | #define __GFP_HIGHMEM ((__force gfp_t)0x02u) | |
a2f1b424 AK |
17 | #ifdef CONFIG_DMA_IS_DMA32 |
18 | #define __GFP_DMA32 ((__force gfp_t)0x01) /* ZONE_DMA is ZONE_DMA32 */ | |
19 | #elif BITS_PER_LONG < 64 | |
20 | #define __GFP_DMA32 ((__force gfp_t)0x00) /* ZONE_NORMAL is ZONE_DMA32 */ | |
21 | #else | |
22 | #define __GFP_DMA32 ((__force gfp_t)0x04) /* Has own ZONE_DMA32 */ | |
23 | #endif | |
1da177e4 LT |
24 | |
25 | /* | |
26 | * Action modifiers - doesn't change the zoning | |
27 | * | |
28 | * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt | |
29 | * _might_ fail. This depends upon the particular VM implementation. | |
30 | * | |
31 | * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller | |
32 | * cannot handle allocation failures. | |
33 | * | |
34 | * __GFP_NORETRY: The VM implementation must not retry indefinitely. | |
35 | */ | |
af4ca457 AV |
36 | #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */ |
37 | #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */ | |
38 | #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */ | |
39 | #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */ | |
40 | #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */ | |
41 | #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */ | |
42 | #define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */ | |
43 | #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */ | |
44 | #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */ | |
45 | #define __GFP_NO_GROW ((__force gfp_t)0x2000u)/* Slab internal usage */ | |
46 | #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */ | |
47 | #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */ | |
48 | #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */ | |
2d6c666e | 49 | #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */ |
1da177e4 | 50 | |
b84a35be | 51 | #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */ |
af4ca457 | 52 | #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
1da177e4 LT |
53 | |
54 | /* if you forget to add the bitmask here kernel will crash, period */ | |
55 | #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \ | |
56 | __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \ | |
b84a35be | 57 | __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \ |
2d6c666e | 58 | __GFP_NOMEMALLOC|__GFP_HARDWALL) |
1da177e4 | 59 | |
7b04d717 JD |
60 | /* This equals 0, but use constants in case they ever change */ |
61 | #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) | |
4eac915d | 62 | /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ |
1da177e4 LT |
63 | #define GFP_ATOMIC (__GFP_HIGH) |
64 | #define GFP_NOIO (__GFP_WAIT) | |
65 | #define GFP_NOFS (__GFP_WAIT | __GFP_IO) | |
66 | #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) | |
f90b1d2f PJ |
67 | #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
68 | #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ | |
69 | __GFP_HIGHMEM) | |
1da177e4 LT |
70 | |
71 | /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some | |
72 | platforms, used as appropriate on others */ | |
73 | ||
74 | #define GFP_DMA __GFP_DMA | |
75 | ||
a2f1b424 AK |
76 | /* 4GB DMA on some platforms */ |
77 | #define GFP_DMA32 __GFP_DMA32 | |
78 | ||
79 | ||
ac3461ad LT |
80 | static inline int gfp_zone(gfp_t gfp) |
81 | { | |
82 | int zone = GFP_ZONEMASK & (__force int) gfp; | |
83 | BUG_ON(zone >= GFP_ZONETYPES); | |
84 | return zone; | |
85 | } | |
1da177e4 LT |
86 | |
87 | /* | |
88 | * There is only one page-allocator function, and two main namespaces to | |
89 | * it. The alloc_page*() variants return 'struct page *' and as such | |
90 | * can allocate highmem pages, the *get*page*() variants return | |
91 | * virtual kernel addresses to the allocated page(s). | |
92 | */ | |
93 | ||
94 | /* | |
95 | * We get the zone list from the current node and the gfp_mask. | |
96 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. | |
97 | * | |
98 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets | |
99 | * optimized to &contig_page_data at compile-time. | |
100 | */ | |
101 | ||
102 | #ifndef HAVE_ARCH_FREE_PAGE | |
103 | static inline void arch_free_page(struct page *page, int order) { } | |
104 | #endif | |
105 | ||
106 | extern struct page * | |
dd0fc66f | 107 | FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *)); |
1da177e4 | 108 | |
dd0fc66f | 109 | static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
1da177e4 LT |
110 | unsigned int order) |
111 | { | |
112 | if (unlikely(order >= MAX_ORDER)) | |
113 | return NULL; | |
114 | ||
819a6928 AK |
115 | /* Unknown node is current node */ |
116 | if (nid < 0) | |
117 | nid = numa_node_id(); | |
118 | ||
1da177e4 | 119 | return __alloc_pages(gfp_mask, order, |
af4ca457 | 120 | NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask)); |
1da177e4 LT |
121 | } |
122 | ||
123 | #ifdef CONFIG_NUMA | |
dd0fc66f | 124 | extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
1da177e4 LT |
125 | |
126 | static inline struct page * | |
dd0fc66f | 127 | alloc_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 LT |
128 | { |
129 | if (unlikely(order >= MAX_ORDER)) | |
130 | return NULL; | |
131 | ||
132 | return alloc_pages_current(gfp_mask, order); | |
133 | } | |
dd0fc66f | 134 | extern struct page *alloc_page_vma(gfp_t gfp_mask, |
1da177e4 LT |
135 | struct vm_area_struct *vma, unsigned long addr); |
136 | #else | |
137 | #define alloc_pages(gfp_mask, order) \ | |
138 | alloc_pages_node(numa_node_id(), gfp_mask, order) | |
139 | #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) | |
140 | #endif | |
141 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) | |
142 | ||
dd0fc66f AV |
143 | extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order)); |
144 | extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask)); | |
1da177e4 LT |
145 | |
146 | #define __get_free_page(gfp_mask) \ | |
147 | __get_free_pages((gfp_mask),0) | |
148 | ||
149 | #define __get_dma_pages(gfp_mask, order) \ | |
150 | __get_free_pages((gfp_mask) | GFP_DMA,(order)) | |
151 | ||
152 | extern void FASTCALL(__free_pages(struct page *page, unsigned int order)); | |
153 | extern void FASTCALL(free_pages(unsigned long addr, unsigned int order)); | |
154 | extern void FASTCALL(free_hot_page(struct page *page)); | |
155 | extern void FASTCALL(free_cold_page(struct page *page)); | |
156 | ||
157 | #define __free_page(page) __free_pages((page), 0) | |
158 | #define free_page(addr) free_pages((addr),0) | |
159 | ||
160 | void page_alloc_init(void); | |
4ae7c039 | 161 | #ifdef CONFIG_NUMA |
8fce4d8e | 162 | void drain_node_pages(int node); |
4ae7c039 | 163 | #else |
8fce4d8e | 164 | static inline void drain_node_pages(int node) { }; |
4ae7c039 | 165 | #endif |
1da177e4 LT |
166 | |
167 | #endif /* __LINUX_GFP_H */ |