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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> | |
1da177e4 LT |
7 | |
8 | struct vm_area_struct; | |
9 | ||
10 | /* | |
11 | * GFP bitmasks.. | |
e53ef38d CL |
12 | * |
13 | * Zone modifiers (see linux/mmzone.h - low three bits) | |
14 | * | |
e53ef38d CL |
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. | |
1da177e4 | 18 | */ |
af4ca457 AV |
19 | #define __GFP_DMA ((__force gfp_t)0x01u) |
20 | #define __GFP_HIGHMEM ((__force gfp_t)0x02u) | |
e53ef38d | 21 | #define __GFP_DMA32 ((__force gfp_t)0x04u) |
1da177e4 LT |
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. | |
769848c0 MG |
33 | * |
34 | * __GFP_MOVABLE: Flag that this page will be movable by the page migration | |
35 | * mechanism or reclaimed | |
1da177e4 | 36 | */ |
af4ca457 AV |
37 | #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */ |
38 | #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */ | |
39 | #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */ | |
40 | #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */ | |
41 | #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */ | |
42 | #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */ | |
43 | #define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */ | |
44 | #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */ | |
45 | #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */ | |
af4ca457 AV |
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 */ |
9b819d20 | 50 | #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */ |
769848c0 | 51 | #define __GFP_MOVABLE ((__force gfp_t)0x80000u) /* Page is movable */ |
1da177e4 | 52 | |
b84a35be | 53 | #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */ |
af4ca457 | 54 | #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
1da177e4 | 55 | |
7b04d717 JD |
56 | /* This equals 0, but use constants in case they ever change */ |
57 | #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) | |
4eac915d | 58 | /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ |
1da177e4 LT |
59 | #define GFP_ATOMIC (__GFP_HIGH) |
60 | #define GFP_NOIO (__GFP_WAIT) | |
61 | #define GFP_NOFS (__GFP_WAIT | __GFP_IO) | |
62 | #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) | |
f90b1d2f PJ |
63 | #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
64 | #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ | |
65 | __GFP_HIGHMEM) | |
769848c0 MG |
66 | #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
67 | __GFP_HARDWALL | __GFP_HIGHMEM | \ | |
68 | __GFP_MOVABLE) | |
69 | #define GFP_NOFS_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_MOVABLE) | |
70 | #define GFP_USER_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ | |
71 | __GFP_HARDWALL | __GFP_MOVABLE) | |
72 | #define GFP_HIGHUSER_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ | |
73 | __GFP_HARDWALL | __GFP_HIGHMEM | \ | |
74 | __GFP_MOVABLE) | |
1da177e4 | 75 | |
77f700da | 76 | #ifdef CONFIG_NUMA |
980128f2 | 77 | #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) |
77f700da | 78 | #else |
f2e97df6 | 79 | #define GFP_THISNODE ((__force gfp_t)0) |
77f700da CL |
80 | #endif |
81 | ||
6cb06229 CL |
82 | /* This mask makes up all the page movable related flags */ |
83 | #define GFP_MOVABLE_MASK (__GFP_MOVABLE) | |
84 | ||
85 | /* Control page allocator reclaim behavior */ | |
86 | #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ | |
87 | __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ | |
88 | __GFP_NORETRY|__GFP_NOMEMALLOC) | |
89 | ||
90 | /* Control allocation constraints */ | |
91 | #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) | |
92 | ||
93 | /* Do not use these with a slab allocator */ | |
94 | #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) | |
980128f2 | 95 | |
1da177e4 LT |
96 | /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some |
97 | platforms, used as appropriate on others */ | |
98 | ||
99 | #define GFP_DMA __GFP_DMA | |
100 | ||
a2f1b424 AK |
101 | /* 4GB DMA on some platforms */ |
102 | #define GFP_DMA32 __GFP_DMA32 | |
103 | ||
104 | ||
19655d34 | 105 | static inline enum zone_type gfp_zone(gfp_t flags) |
4e4785bc | 106 | { |
523b9458 CL |
107 | int base = 0; |
108 | ||
109 | #ifdef CONFIG_NUMA | |
110 | if (flags & __GFP_THISNODE) | |
111 | base = MAX_NR_ZONES; | |
112 | #endif | |
113 | ||
4b51d669 | 114 | #ifdef CONFIG_ZONE_DMA |
4e4785bc | 115 | if (flags & __GFP_DMA) |
523b9458 | 116 | return base + ZONE_DMA; |
4b51d669 | 117 | #endif |
4e4785bc CL |
118 | #ifdef CONFIG_ZONE_DMA32 |
119 | if (flags & __GFP_DMA32) | |
523b9458 | 120 | return base + ZONE_DMA32; |
4e4785bc | 121 | #endif |
2a1e274a MG |
122 | if ((flags & (__GFP_HIGHMEM | __GFP_MOVABLE)) == |
123 | (__GFP_HIGHMEM | __GFP_MOVABLE)) | |
523b9458 | 124 | return base + ZONE_MOVABLE; |
4e4785bc CL |
125 | #ifdef CONFIG_HIGHMEM |
126 | if (flags & __GFP_HIGHMEM) | |
523b9458 | 127 | return base + ZONE_HIGHMEM; |
4e4785bc | 128 | #endif |
523b9458 | 129 | return base + ZONE_NORMAL; |
4e4785bc CL |
130 | } |
131 | ||
1da177e4 LT |
132 | /* |
133 | * There is only one page-allocator function, and two main namespaces to | |
134 | * it. The alloc_page*() variants return 'struct page *' and as such | |
135 | * can allocate highmem pages, the *get*page*() variants return | |
136 | * virtual kernel addresses to the allocated page(s). | |
137 | */ | |
138 | ||
139 | /* | |
140 | * We get the zone list from the current node and the gfp_mask. | |
141 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. | |
142 | * | |
143 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets | |
144 | * optimized to &contig_page_data at compile-time. | |
145 | */ | |
146 | ||
147 | #ifndef HAVE_ARCH_FREE_PAGE | |
148 | static inline void arch_free_page(struct page *page, int order) { } | |
149 | #endif | |
cc102509 NP |
150 | #ifndef HAVE_ARCH_ALLOC_PAGE |
151 | static inline void arch_alloc_page(struct page *page, int order) { } | |
152 | #endif | |
1da177e4 LT |
153 | |
154 | extern struct page * | |
dd0fc66f | 155 | FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *)); |
1da177e4 | 156 | |
dd0fc66f | 157 | static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
1da177e4 LT |
158 | unsigned int order) |
159 | { | |
160 | if (unlikely(order >= MAX_ORDER)) | |
161 | return NULL; | |
162 | ||
819a6928 AK |
163 | /* Unknown node is current node */ |
164 | if (nid < 0) | |
165 | nid = numa_node_id(); | |
166 | ||
1da177e4 | 167 | return __alloc_pages(gfp_mask, order, |
af4ca457 | 168 | NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask)); |
1da177e4 LT |
169 | } |
170 | ||
171 | #ifdef CONFIG_NUMA | |
dd0fc66f | 172 | extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
1da177e4 LT |
173 | |
174 | static inline struct page * | |
dd0fc66f | 175 | alloc_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 LT |
176 | { |
177 | if (unlikely(order >= MAX_ORDER)) | |
178 | return NULL; | |
179 | ||
180 | return alloc_pages_current(gfp_mask, order); | |
181 | } | |
dd0fc66f | 182 | extern struct page *alloc_page_vma(gfp_t gfp_mask, |
1da177e4 LT |
183 | struct vm_area_struct *vma, unsigned long addr); |
184 | #else | |
185 | #define alloc_pages(gfp_mask, order) \ | |
186 | alloc_pages_node(numa_node_id(), gfp_mask, order) | |
187 | #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) | |
188 | #endif | |
189 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) | |
190 | ||
dd0fc66f AV |
191 | extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order)); |
192 | extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask)); | |
1da177e4 LT |
193 | |
194 | #define __get_free_page(gfp_mask) \ | |
195 | __get_free_pages((gfp_mask),0) | |
196 | ||
197 | #define __get_dma_pages(gfp_mask, order) \ | |
198 | __get_free_pages((gfp_mask) | GFP_DMA,(order)) | |
199 | ||
200 | extern void FASTCALL(__free_pages(struct page *page, unsigned int order)); | |
201 | extern void FASTCALL(free_pages(unsigned long addr, unsigned int order)); | |
202 | extern void FASTCALL(free_hot_page(struct page *page)); | |
203 | extern void FASTCALL(free_cold_page(struct page *page)); | |
204 | ||
205 | #define __free_page(page) __free_pages((page), 0) | |
206 | #define free_page(addr) free_pages((addr),0) | |
207 | ||
208 | void page_alloc_init(void); | |
4037d452 | 209 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); |
1da177e4 LT |
210 | |
211 | #endif /* __LINUX_GFP_H */ |