Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef __LINUX_GFP_H |
2 | #define __LINUX_GFP_H | |
3 | ||
309381fe | 4 | #include <linux/mmdebug.h> |
1da177e4 LT |
5 | #include <linux/mmzone.h> |
6 | #include <linux/stddef.h> | |
7 | #include <linux/linkage.h> | |
082edb7b | 8 | #include <linux/topology.h> |
1da177e4 LT |
9 | |
10 | struct vm_area_struct; | |
11 | ||
16b56cf4 NK |
12 | /* Plain integer GFP bitmasks. Do not use this directly. */ |
13 | #define ___GFP_DMA 0x01u | |
14 | #define ___GFP_HIGHMEM 0x02u | |
15 | #define ___GFP_DMA32 0x04u | |
16 | #define ___GFP_MOVABLE 0x08u | |
17 | #define ___GFP_WAIT 0x10u | |
18 | #define ___GFP_HIGH 0x20u | |
19 | #define ___GFP_IO 0x40u | |
20 | #define ___GFP_FS 0x80u | |
21 | #define ___GFP_COLD 0x100u | |
22 | #define ___GFP_NOWARN 0x200u | |
23 | #define ___GFP_REPEAT 0x400u | |
24 | #define ___GFP_NOFAIL 0x800u | |
25 | #define ___GFP_NORETRY 0x1000u | |
b37f1dd0 | 26 | #define ___GFP_MEMALLOC 0x2000u |
16b56cf4 NK |
27 | #define ___GFP_COMP 0x4000u |
28 | #define ___GFP_ZERO 0x8000u | |
29 | #define ___GFP_NOMEMALLOC 0x10000u | |
30 | #define ___GFP_HARDWALL 0x20000u | |
31 | #define ___GFP_THISNODE 0x40000u | |
32 | #define ___GFP_RECLAIMABLE 0x80000u | |
caf49191 LT |
33 | #define ___GFP_NOTRACK 0x200000u |
34 | #define ___GFP_NO_KSWAPD 0x400000u | |
35 | #define ___GFP_OTHER_NODE 0x800000u | |
36 | #define ___GFP_WRITE 0x1000000u | |
05b0afd7 | 37 | /* If the above are modified, __GFP_BITS_SHIFT may need updating */ |
16b56cf4 | 38 | |
1da177e4 LT |
39 | /* |
40 | * GFP bitmasks.. | |
e53ef38d CL |
41 | * |
42 | * Zone modifiers (see linux/mmzone.h - low three bits) | |
43 | * | |
e53ef38d | 44 | * Do not put any conditional on these. If necessary modify the definitions |
263ff5d8 | 45 | * without the underscores and use them consistently. The definitions here may |
e53ef38d | 46 | * be used in bit comparisons. |
1da177e4 | 47 | */ |
16b56cf4 NK |
48 | #define __GFP_DMA ((__force gfp_t)___GFP_DMA) |
49 | #define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM) | |
50 | #define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32) | |
51 | #define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* Page is movable */ | |
b70d94ee | 52 | #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) |
1da177e4 LT |
53 | /* |
54 | * Action modifiers - doesn't change the zoning | |
55 | * | |
56 | * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt | |
57 | * _might_ fail. This depends upon the particular VM implementation. | |
58 | * | |
59 | * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller | |
478352e7 DR |
60 | * cannot handle allocation failures. This modifier is deprecated and no new |
61 | * users should be added. | |
1da177e4 LT |
62 | * |
63 | * __GFP_NORETRY: The VM implementation must not retry indefinitely. | |
769848c0 MG |
64 | * |
65 | * __GFP_MOVABLE: Flag that this page will be movable by the page migration | |
66 | * mechanism or reclaimed | |
1da177e4 | 67 | */ |
16b56cf4 NK |
68 | #define __GFP_WAIT ((__force gfp_t)___GFP_WAIT) /* Can wait and reschedule? */ |
69 | #define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) /* Should access emergency pools? */ | |
70 | #define __GFP_IO ((__force gfp_t)___GFP_IO) /* Can start physical IO? */ | |
71 | #define __GFP_FS ((__force gfp_t)___GFP_FS) /* Can call down to low-level FS? */ | |
72 | #define __GFP_COLD ((__force gfp_t)___GFP_COLD) /* Cache-cold page required */ | |
73 | #define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) /* Suppress page allocation failure warning */ | |
74 | #define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) /* See above */ | |
75 | #define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) /* See above */ | |
76 | #define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */ | |
b37f1dd0 | 77 | #define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC)/* Allow access to emergency reserves */ |
16b56cf4 NK |
78 | #define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */ |
79 | #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */ | |
b37f1dd0 MG |
80 | #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves. |
81 | * This takes precedence over the | |
82 | * __GFP_MEMALLOC flag if both are | |
83 | * set | |
84 | */ | |
16b56cf4 NK |
85 | #define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */ |
86 | #define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */ | |
87 | #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */ | |
88 | #define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */ | |
1da177e4 | 89 | |
caf49191 | 90 | #define __GFP_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD) |
78afd561 | 91 | #define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */ |
a756cf59 | 92 | #define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to dirty page */ |
32dba98e | 93 | |
2dff4405 VN |
94 | /* |
95 | * This may seem redundant, but it's a way of annotating false positives vs. | |
96 | * allocations that simply cannot be supported (e.g. page tables). | |
97 | */ | |
98 | #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK) | |
99 | ||
caf49191 | 100 | #define __GFP_BITS_SHIFT 25 /* Room for N __GFP_FOO bits */ |
af4ca457 | 101 | #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
1da177e4 | 102 | |
7b04d717 JD |
103 | /* This equals 0, but use constants in case they ever change */ |
104 | #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) | |
4eac915d | 105 | /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ |
1da177e4 LT |
106 | #define GFP_ATOMIC (__GFP_HIGH) |
107 | #define GFP_NOIO (__GFP_WAIT) | |
108 | #define GFP_NOFS (__GFP_WAIT | __GFP_IO) | |
109 | #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) | |
e12ba74d MG |
110 | #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
111 | __GFP_RECLAIMABLE) | |
f90b1d2f PJ |
112 | #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
113 | #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ | |
114 | __GFP_HIGHMEM) | |
769848c0 MG |
115 | #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
116 | __GFP_HARDWALL | __GFP_HIGHMEM | \ | |
117 | __GFP_MOVABLE) | |
452aa699 | 118 | #define GFP_IOFS (__GFP_IO | __GFP_FS) |
71e3aac0 | 119 | #define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ |
caf49191 LT |
120 | __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \ |
121 | __GFP_NO_KSWAPD) | |
1da177e4 | 122 | |
e97ca8e5 JW |
123 | /* |
124 | * GFP_THISNODE does not perform any reclaim, you most likely want to | |
125 | * use __GFP_THISNODE to allocate from a given node without fallback! | |
126 | */ | |
77f700da | 127 | #ifdef CONFIG_NUMA |
980128f2 | 128 | #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) |
77f700da | 129 | #else |
f2e97df6 | 130 | #define GFP_THISNODE ((__force gfp_t)0) |
77f700da CL |
131 | #endif |
132 | ||
6cb06229 | 133 | /* This mask makes up all the page movable related flags */ |
e12ba74d | 134 | #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) |
6cb06229 CL |
135 | |
136 | /* Control page allocator reclaim behavior */ | |
137 | #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ | |
138 | __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ | |
b37f1dd0 | 139 | __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC) |
6cb06229 | 140 | |
7e85ee0c | 141 | /* Control slab gfp mask during early boot */ |
fd23855e | 142 | #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)) |
7e85ee0c | 143 | |
6cb06229 CL |
144 | /* Control allocation constraints */ |
145 | #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) | |
146 | ||
147 | /* Do not use these with a slab allocator */ | |
148 | #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) | |
980128f2 | 149 | |
1da177e4 LT |
150 | /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some |
151 | platforms, used as appropriate on others */ | |
152 | ||
153 | #define GFP_DMA __GFP_DMA | |
154 | ||
a2f1b424 AK |
155 | /* 4GB DMA on some platforms */ |
156 | #define GFP_DMA32 __GFP_DMA32 | |
157 | ||
467c996c MG |
158 | /* Convert GFP flags to their corresponding migrate type */ |
159 | static inline int allocflags_to_migratetype(gfp_t gfp_flags) | |
160 | { | |
161 | WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); | |
162 | ||
163 | if (unlikely(page_group_by_mobility_disabled)) | |
164 | return MIGRATE_UNMOVABLE; | |
165 | ||
166 | /* Group based on mobility */ | |
167 | return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | | |
168 | ((gfp_flags & __GFP_RECLAIMABLE) != 0); | |
169 | } | |
a2f1b424 | 170 | |
b70d94ee CL |
171 | #ifdef CONFIG_HIGHMEM |
172 | #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM | |
173 | #else | |
174 | #define OPT_ZONE_HIGHMEM ZONE_NORMAL | |
175 | #endif | |
176 | ||
4b51d669 | 177 | #ifdef CONFIG_ZONE_DMA |
b70d94ee CL |
178 | #define OPT_ZONE_DMA ZONE_DMA |
179 | #else | |
180 | #define OPT_ZONE_DMA ZONE_NORMAL | |
4b51d669 | 181 | #endif |
b70d94ee | 182 | |
4e4785bc | 183 | #ifdef CONFIG_ZONE_DMA32 |
b70d94ee CL |
184 | #define OPT_ZONE_DMA32 ZONE_DMA32 |
185 | #else | |
186 | #define OPT_ZONE_DMA32 ZONE_NORMAL | |
4e4785bc | 187 | #endif |
b70d94ee CL |
188 | |
189 | /* | |
190 | * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the | |
191 | * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long | |
192 | * and there are 16 of them to cover all possible combinations of | |
263ff5d8 | 193 | * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM. |
b70d94ee CL |
194 | * |
195 | * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. | |
196 | * But GFP_MOVABLE is not only a zone specifier but also an allocation | |
197 | * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. | |
263ff5d8 | 198 | * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1". |
b70d94ee CL |
199 | * |
200 | * bit result | |
201 | * ================= | |
202 | * 0x0 => NORMAL | |
203 | * 0x1 => DMA or NORMAL | |
204 | * 0x2 => HIGHMEM or NORMAL | |
205 | * 0x3 => BAD (DMA+HIGHMEM) | |
206 | * 0x4 => DMA32 or DMA or NORMAL | |
207 | * 0x5 => BAD (DMA+DMA32) | |
208 | * 0x6 => BAD (HIGHMEM+DMA32) | |
209 | * 0x7 => BAD (HIGHMEM+DMA32+DMA) | |
210 | * 0x8 => NORMAL (MOVABLE+0) | |
211 | * 0x9 => DMA or NORMAL (MOVABLE+DMA) | |
212 | * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) | |
213 | * 0xb => BAD (MOVABLE+HIGHMEM+DMA) | |
537926ca | 214 | * 0xc => DMA32 (MOVABLE+DMA32) |
b70d94ee CL |
215 | * 0xd => BAD (MOVABLE+DMA32+DMA) |
216 | * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) | |
217 | * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) | |
218 | * | |
219 | * ZONES_SHIFT must be <= 2 on 32 bit platforms. | |
220 | */ | |
221 | ||
222 | #if 16 * ZONES_SHIFT > BITS_PER_LONG | |
223 | #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer | |
224 | #endif | |
225 | ||
226 | #define GFP_ZONE_TABLE ( \ | |
16b56cf4 NK |
227 | (ZONE_NORMAL << 0 * ZONES_SHIFT) \ |
228 | | (OPT_ZONE_DMA << ___GFP_DMA * ZONES_SHIFT) \ | |
229 | | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * ZONES_SHIFT) \ | |
230 | | (OPT_ZONE_DMA32 << ___GFP_DMA32 * ZONES_SHIFT) \ | |
231 | | (ZONE_NORMAL << ___GFP_MOVABLE * ZONES_SHIFT) \ | |
232 | | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * ZONES_SHIFT) \ | |
233 | | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * ZONES_SHIFT) \ | |
234 | | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * ZONES_SHIFT) \ | |
b70d94ee CL |
235 | ) |
236 | ||
237 | /* | |
263ff5d8 | 238 | * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32 |
b70d94ee CL |
239 | * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per |
240 | * entry starting with bit 0. Bit is set if the combination is not | |
241 | * allowed. | |
242 | */ | |
243 | #define GFP_ZONE_BAD ( \ | |
16b56cf4 NK |
244 | 1 << (___GFP_DMA | ___GFP_HIGHMEM) \ |
245 | | 1 << (___GFP_DMA | ___GFP_DMA32) \ | |
246 | | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \ | |
247 | | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \ | |
248 | | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \ | |
249 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \ | |
250 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \ | |
251 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \ | |
b70d94ee CL |
252 | ) |
253 | ||
254 | static inline enum zone_type gfp_zone(gfp_t flags) | |
255 | { | |
256 | enum zone_type z; | |
16b56cf4 | 257 | int bit = (__force int) (flags & GFP_ZONEMASK); |
b70d94ee CL |
258 | |
259 | z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) & | |
260 | ((1 << ZONES_SHIFT) - 1); | |
82d4b577 | 261 | VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1); |
b70d94ee | 262 | return z; |
4e4785bc CL |
263 | } |
264 | ||
1da177e4 LT |
265 | /* |
266 | * There is only one page-allocator function, and two main namespaces to | |
267 | * it. The alloc_page*() variants return 'struct page *' and as such | |
268 | * can allocate highmem pages, the *get*page*() variants return | |
269 | * virtual kernel addresses to the allocated page(s). | |
270 | */ | |
271 | ||
54a6eb5c MG |
272 | static inline int gfp_zonelist(gfp_t flags) |
273 | { | |
e5adfffc | 274 | if (IS_ENABLED(CONFIG_NUMA) && unlikely(flags & __GFP_THISNODE)) |
54a6eb5c MG |
275 | return 1; |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
1da177e4 LT |
280 | /* |
281 | * We get the zone list from the current node and the gfp_mask. | |
282 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. | |
54a6eb5c MG |
283 | * There are two zonelists per node, one for all zones with memory and |
284 | * one containing just zones from the node the zonelist belongs to. | |
1da177e4 LT |
285 | * |
286 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets | |
287 | * optimized to &contig_page_data at compile-time. | |
288 | */ | |
0e88460d MG |
289 | static inline struct zonelist *node_zonelist(int nid, gfp_t flags) |
290 | { | |
54a6eb5c | 291 | return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); |
0e88460d | 292 | } |
1da177e4 LT |
293 | |
294 | #ifndef HAVE_ARCH_FREE_PAGE | |
295 | static inline void arch_free_page(struct page *page, int order) { } | |
296 | #endif | |
cc102509 NP |
297 | #ifndef HAVE_ARCH_ALLOC_PAGE |
298 | static inline void arch_alloc_page(struct page *page, int order) { } | |
299 | #endif | |
1da177e4 | 300 | |
e4048e5d | 301 | struct page * |
d239171e | 302 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, |
e4048e5d KM |
303 | struct zonelist *zonelist, nodemask_t *nodemask); |
304 | ||
305 | static inline struct page * | |
306 | __alloc_pages(gfp_t gfp_mask, unsigned int order, | |
307 | struct zonelist *zonelist) | |
308 | { | |
d239171e | 309 | return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL); |
e4048e5d KM |
310 | } |
311 | ||
dd0fc66f | 312 | static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
1da177e4 LT |
313 | unsigned int order) |
314 | { | |
819a6928 AK |
315 | /* Unknown node is current node */ |
316 | if (nid < 0) | |
317 | nid = numa_node_id(); | |
318 | ||
0e88460d | 319 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); |
1da177e4 LT |
320 | } |
321 | ||
6484eb3e MG |
322 | static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask, |
323 | unsigned int order) | |
324 | { | |
f6d7e0cb | 325 | VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES || !node_online(nid)); |
6484eb3e MG |
326 | |
327 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); | |
328 | } | |
329 | ||
1da177e4 | 330 | #ifdef CONFIG_NUMA |
dd0fc66f | 331 | extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
1da177e4 LT |
332 | |
333 | static inline struct page * | |
dd0fc66f | 334 | alloc_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 | 335 | { |
1da177e4 LT |
336 | return alloc_pages_current(gfp_mask, order); |
337 | } | |
0bbbc0b3 | 338 | extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, |
2f5f9486 AK |
339 | struct vm_area_struct *vma, unsigned long addr, |
340 | int node); | |
1da177e4 LT |
341 | #else |
342 | #define alloc_pages(gfp_mask, order) \ | |
343 | alloc_pages_node(numa_node_id(), gfp_mask, order) | |
2f5f9486 | 344 | #define alloc_pages_vma(gfp_mask, order, vma, addr, node) \ |
0bbbc0b3 | 345 | alloc_pages(gfp_mask, order) |
1da177e4 LT |
346 | #endif |
347 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) | |
2f5f9486 AK |
348 | #define alloc_page_vma(gfp_mask, vma, addr) \ |
349 | alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id()) | |
236344d6 AK |
350 | #define alloc_page_vma_node(gfp_mask, vma, addr, node) \ |
351 | alloc_pages_vma(gfp_mask, 0, vma, addr, node) | |
1da177e4 | 352 | |
52383431 VD |
353 | extern struct page *alloc_kmem_pages(gfp_t gfp_mask, unsigned int order); |
354 | extern struct page *alloc_kmem_pages_node(int nid, gfp_t gfp_mask, | |
355 | unsigned int order); | |
356 | ||
b3c97528 HH |
357 | extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); |
358 | extern unsigned long get_zeroed_page(gfp_t gfp_mask); | |
1da177e4 | 359 | |
2be0ffe2 TT |
360 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask); |
361 | void free_pages_exact(void *virt, size_t size); | |
ee85c2e1 | 362 | /* This is different from alloc_pages_exact_node !!! */ |
e1931811 | 363 | void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); |
2be0ffe2 | 364 | |
1da177e4 | 365 | #define __get_free_page(gfp_mask) \ |
fd23855e | 366 | __get_free_pages((gfp_mask), 0) |
1da177e4 LT |
367 | |
368 | #define __get_dma_pages(gfp_mask, order) \ | |
fd23855e | 369 | __get_free_pages((gfp_mask) | GFP_DMA, (order)) |
1da177e4 | 370 | |
b3c97528 HH |
371 | extern void __free_pages(struct page *page, unsigned int order); |
372 | extern void free_pages(unsigned long addr, unsigned int order); | |
b745bc85 MG |
373 | extern void free_hot_cold_page(struct page *page, bool cold); |
374 | extern void free_hot_cold_page_list(struct list_head *list, bool cold); | |
1da177e4 | 375 | |
52383431 VD |
376 | extern void __free_kmem_pages(struct page *page, unsigned int order); |
377 | extern void free_kmem_pages(unsigned long addr, unsigned int order); | |
6a1a0d3b | 378 | |
1da177e4 | 379 | #define __free_page(page) __free_pages((page), 0) |
fd23855e | 380 | #define free_page(addr) free_pages((addr), 0) |
1da177e4 LT |
381 | |
382 | void page_alloc_init(void); | |
4037d452 | 383 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); |
9f8f2172 CL |
384 | void drain_all_pages(void); |
385 | void drain_local_pages(void *dummy); | |
1da177e4 | 386 | |
f90ac398 MG |
387 | /* |
388 | * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what | |
389 | * GFP flags are used before interrupts are enabled. Once interrupts are | |
390 | * enabled, it is set to __GFP_BITS_MASK while the system is running. During | |
391 | * hibernation, it is used by PM to avoid I/O during memory allocation while | |
392 | * devices are suspended. | |
393 | */ | |
dcce284a BH |
394 | extern gfp_t gfp_allowed_mask; |
395 | ||
c93bdd0e MG |
396 | /* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */ |
397 | bool gfp_pfmemalloc_allowed(gfp_t gfp_mask); | |
398 | ||
c9e664f1 RW |
399 | extern void pm_restrict_gfp_mask(void); |
400 | extern void pm_restore_gfp_mask(void); | |
dcce284a | 401 | |
f90ac398 MG |
402 | #ifdef CONFIG_PM_SLEEP |
403 | extern bool pm_suspended_storage(void); | |
404 | #else | |
405 | static inline bool pm_suspended_storage(void) | |
406 | { | |
407 | return false; | |
408 | } | |
409 | #endif /* CONFIG_PM_SLEEP */ | |
410 | ||
041d3a8c MN |
411 | #ifdef CONFIG_CMA |
412 | ||
413 | /* The below functions must be run on a range from a single zone. */ | |
0815f3d8 MN |
414 | extern int alloc_contig_range(unsigned long start, unsigned long end, |
415 | unsigned migratetype); | |
041d3a8c MN |
416 | extern void free_contig_range(unsigned long pfn, unsigned nr_pages); |
417 | ||
47118af0 MN |
418 | /* CMA stuff */ |
419 | extern void init_cma_reserved_pageblock(struct page *page); | |
420 | ||
041d3a8c MN |
421 | #endif |
422 | ||
1da177e4 | 423 | #endif /* __LINUX_GFP_H */ |