Commit | Line | Data |
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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> | |
082edb7b | 7 | #include <linux/topology.h> |
6484eb3e | 8 | #include <linux/mmdebug.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 | |
16b56cf4 | 37 | |
1da177e4 LT |
38 | /* |
39 | * GFP bitmasks.. | |
e53ef38d CL |
40 | * |
41 | * Zone modifiers (see linux/mmzone.h - low three bits) | |
42 | * | |
e53ef38d | 43 | * Do not put any conditional on these. If necessary modify the definitions |
263ff5d8 | 44 | * without the underscores and use them consistently. The definitions here may |
e53ef38d | 45 | * be used in bit comparisons. |
1da177e4 | 46 | */ |
16b56cf4 NK |
47 | #define __GFP_DMA ((__force gfp_t)___GFP_DMA) |
48 | #define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM) | |
49 | #define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32) | |
50 | #define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* Page is movable */ | |
b70d94ee | 51 | #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) |
1da177e4 LT |
52 | /* |
53 | * Action modifiers - doesn't change the zoning | |
54 | * | |
55 | * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt | |
56 | * _might_ fail. This depends upon the particular VM implementation. | |
57 | * | |
58 | * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller | |
478352e7 DR |
59 | * cannot handle allocation failures. This modifier is deprecated and no new |
60 | * users should be added. | |
1da177e4 LT |
61 | * |
62 | * __GFP_NORETRY: The VM implementation must not retry indefinitely. | |
769848c0 MG |
63 | * |
64 | * __GFP_MOVABLE: Flag that this page will be movable by the page migration | |
65 | * mechanism or reclaimed | |
1da177e4 | 66 | */ |
16b56cf4 NK |
67 | #define __GFP_WAIT ((__force gfp_t)___GFP_WAIT) /* Can wait and reschedule? */ |
68 | #define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) /* Should access emergency pools? */ | |
69 | #define __GFP_IO ((__force gfp_t)___GFP_IO) /* Can start physical IO? */ | |
70 | #define __GFP_FS ((__force gfp_t)___GFP_FS) /* Can call down to low-level FS? */ | |
71 | #define __GFP_COLD ((__force gfp_t)___GFP_COLD) /* Cache-cold page required */ | |
72 | #define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) /* Suppress page allocation failure warning */ | |
73 | #define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) /* See above */ | |
74 | #define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) /* See above */ | |
75 | #define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */ | |
b37f1dd0 | 76 | #define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC)/* Allow access to emergency reserves */ |
16b56cf4 NK |
77 | #define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */ |
78 | #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */ | |
b37f1dd0 MG |
79 | #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves. |
80 | * This takes precedence over the | |
81 | * __GFP_MEMALLOC flag if both are | |
82 | * set | |
83 | */ | |
16b56cf4 NK |
84 | #define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */ |
85 | #define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */ | |
86 | #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */ | |
87 | #define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */ | |
1da177e4 | 88 | |
caf49191 | 89 | #define __GFP_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD) |
78afd561 | 90 | #define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */ |
a756cf59 | 91 | #define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to dirty page */ |
32dba98e | 92 | |
2dff4405 VN |
93 | /* |
94 | * This may seem redundant, but it's a way of annotating false positives vs. | |
95 | * allocations that simply cannot be supported (e.g. page tables). | |
96 | */ | |
97 | #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK) | |
98 | ||
caf49191 | 99 | #define __GFP_BITS_SHIFT 25 /* Room for N __GFP_FOO bits */ |
af4ca457 | 100 | #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
1da177e4 | 101 | |
7b04d717 JD |
102 | /* This equals 0, but use constants in case they ever change */ |
103 | #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) | |
4eac915d | 104 | /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ |
1da177e4 LT |
105 | #define GFP_ATOMIC (__GFP_HIGH) |
106 | #define GFP_NOIO (__GFP_WAIT) | |
107 | #define GFP_NOFS (__GFP_WAIT | __GFP_IO) | |
108 | #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) | |
e12ba74d MG |
109 | #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
110 | __GFP_RECLAIMABLE) | |
f90b1d2f PJ |
111 | #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
112 | #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ | |
113 | __GFP_HIGHMEM) | |
769848c0 MG |
114 | #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
115 | __GFP_HARDWALL | __GFP_HIGHMEM | \ | |
116 | __GFP_MOVABLE) | |
452aa699 | 117 | #define GFP_IOFS (__GFP_IO | __GFP_FS) |
71e3aac0 | 118 | #define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ |
caf49191 LT |
119 | __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \ |
120 | __GFP_NO_KSWAPD) | |
1da177e4 | 121 | |
77f700da | 122 | #ifdef CONFIG_NUMA |
980128f2 | 123 | #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) |
77f700da | 124 | #else |
f2e97df6 | 125 | #define GFP_THISNODE ((__force gfp_t)0) |
77f700da CL |
126 | #endif |
127 | ||
6cb06229 | 128 | /* This mask makes up all the page movable related flags */ |
e12ba74d | 129 | #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) |
6cb06229 CL |
130 | |
131 | /* Control page allocator reclaim behavior */ | |
132 | #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ | |
133 | __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ | |
b37f1dd0 | 134 | __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC) |
6cb06229 | 135 | |
7e85ee0c | 136 | /* Control slab gfp mask during early boot */ |
fd23855e | 137 | #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)) |
7e85ee0c | 138 | |
6cb06229 CL |
139 | /* Control allocation constraints */ |
140 | #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) | |
141 | ||
142 | /* Do not use these with a slab allocator */ | |
143 | #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) | |
980128f2 | 144 | |
1da177e4 LT |
145 | /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some |
146 | platforms, used as appropriate on others */ | |
147 | ||
148 | #define GFP_DMA __GFP_DMA | |
149 | ||
a2f1b424 AK |
150 | /* 4GB DMA on some platforms */ |
151 | #define GFP_DMA32 __GFP_DMA32 | |
152 | ||
467c996c MG |
153 | /* Convert GFP flags to their corresponding migrate type */ |
154 | static inline int allocflags_to_migratetype(gfp_t gfp_flags) | |
155 | { | |
156 | WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); | |
157 | ||
158 | if (unlikely(page_group_by_mobility_disabled)) | |
159 | return MIGRATE_UNMOVABLE; | |
160 | ||
161 | /* Group based on mobility */ | |
162 | return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | | |
163 | ((gfp_flags & __GFP_RECLAIMABLE) != 0); | |
164 | } | |
a2f1b424 | 165 | |
b70d94ee CL |
166 | #ifdef CONFIG_HIGHMEM |
167 | #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM | |
168 | #else | |
169 | #define OPT_ZONE_HIGHMEM ZONE_NORMAL | |
170 | #endif | |
171 | ||
4b51d669 | 172 | #ifdef CONFIG_ZONE_DMA |
b70d94ee CL |
173 | #define OPT_ZONE_DMA ZONE_DMA |
174 | #else | |
175 | #define OPT_ZONE_DMA ZONE_NORMAL | |
4b51d669 | 176 | #endif |
b70d94ee | 177 | |
4e4785bc | 178 | #ifdef CONFIG_ZONE_DMA32 |
b70d94ee CL |
179 | #define OPT_ZONE_DMA32 ZONE_DMA32 |
180 | #else | |
181 | #define OPT_ZONE_DMA32 ZONE_NORMAL | |
4e4785bc | 182 | #endif |
b70d94ee CL |
183 | |
184 | /* | |
185 | * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the | |
186 | * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long | |
187 | * and there are 16 of them to cover all possible combinations of | |
263ff5d8 | 188 | * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM. |
b70d94ee CL |
189 | * |
190 | * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. | |
191 | * But GFP_MOVABLE is not only a zone specifier but also an allocation | |
192 | * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. | |
263ff5d8 | 193 | * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1". |
b70d94ee CL |
194 | * |
195 | * bit result | |
196 | * ================= | |
197 | * 0x0 => NORMAL | |
198 | * 0x1 => DMA or NORMAL | |
199 | * 0x2 => HIGHMEM or NORMAL | |
200 | * 0x3 => BAD (DMA+HIGHMEM) | |
201 | * 0x4 => DMA32 or DMA or NORMAL | |
202 | * 0x5 => BAD (DMA+DMA32) | |
203 | * 0x6 => BAD (HIGHMEM+DMA32) | |
204 | * 0x7 => BAD (HIGHMEM+DMA32+DMA) | |
205 | * 0x8 => NORMAL (MOVABLE+0) | |
206 | * 0x9 => DMA or NORMAL (MOVABLE+DMA) | |
207 | * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) | |
208 | * 0xb => BAD (MOVABLE+HIGHMEM+DMA) | |
209 | * 0xc => DMA32 (MOVABLE+HIGHMEM+DMA32) | |
210 | * 0xd => BAD (MOVABLE+DMA32+DMA) | |
211 | * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) | |
212 | * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) | |
213 | * | |
214 | * ZONES_SHIFT must be <= 2 on 32 bit platforms. | |
215 | */ | |
216 | ||
217 | #if 16 * ZONES_SHIFT > BITS_PER_LONG | |
218 | #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer | |
219 | #endif | |
220 | ||
221 | #define GFP_ZONE_TABLE ( \ | |
16b56cf4 NK |
222 | (ZONE_NORMAL << 0 * ZONES_SHIFT) \ |
223 | | (OPT_ZONE_DMA << ___GFP_DMA * ZONES_SHIFT) \ | |
224 | | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * ZONES_SHIFT) \ | |
225 | | (OPT_ZONE_DMA32 << ___GFP_DMA32 * ZONES_SHIFT) \ | |
226 | | (ZONE_NORMAL << ___GFP_MOVABLE * ZONES_SHIFT) \ | |
227 | | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * ZONES_SHIFT) \ | |
228 | | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * ZONES_SHIFT) \ | |
229 | | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * ZONES_SHIFT) \ | |
b70d94ee CL |
230 | ) |
231 | ||
232 | /* | |
263ff5d8 | 233 | * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32 |
b70d94ee CL |
234 | * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per |
235 | * entry starting with bit 0. Bit is set if the combination is not | |
236 | * allowed. | |
237 | */ | |
238 | #define GFP_ZONE_BAD ( \ | |
16b56cf4 NK |
239 | 1 << (___GFP_DMA | ___GFP_HIGHMEM) \ |
240 | | 1 << (___GFP_DMA | ___GFP_DMA32) \ | |
241 | | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \ | |
242 | | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \ | |
243 | | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \ | |
244 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \ | |
245 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \ | |
246 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \ | |
b70d94ee CL |
247 | ) |
248 | ||
249 | static inline enum zone_type gfp_zone(gfp_t flags) | |
250 | { | |
251 | enum zone_type z; | |
16b56cf4 | 252 | int bit = (__force int) (flags & GFP_ZONEMASK); |
b70d94ee CL |
253 | |
254 | z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) & | |
255 | ((1 << ZONES_SHIFT) - 1); | |
82d4b577 | 256 | VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1); |
b70d94ee | 257 | return z; |
4e4785bc CL |
258 | } |
259 | ||
1da177e4 LT |
260 | /* |
261 | * There is only one page-allocator function, and two main namespaces to | |
262 | * it. The alloc_page*() variants return 'struct page *' and as such | |
263 | * can allocate highmem pages, the *get*page*() variants return | |
264 | * virtual kernel addresses to the allocated page(s). | |
265 | */ | |
266 | ||
54a6eb5c MG |
267 | static inline int gfp_zonelist(gfp_t flags) |
268 | { | |
e5adfffc | 269 | if (IS_ENABLED(CONFIG_NUMA) && unlikely(flags & __GFP_THISNODE)) |
54a6eb5c MG |
270 | return 1; |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
1da177e4 LT |
275 | /* |
276 | * We get the zone list from the current node and the gfp_mask. | |
277 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. | |
54a6eb5c MG |
278 | * There are two zonelists per node, one for all zones with memory and |
279 | * one containing just zones from the node the zonelist belongs to. | |
1da177e4 LT |
280 | * |
281 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets | |
282 | * optimized to &contig_page_data at compile-time. | |
283 | */ | |
0e88460d MG |
284 | static inline struct zonelist *node_zonelist(int nid, gfp_t flags) |
285 | { | |
54a6eb5c | 286 | return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); |
0e88460d | 287 | } |
1da177e4 LT |
288 | |
289 | #ifndef HAVE_ARCH_FREE_PAGE | |
290 | static inline void arch_free_page(struct page *page, int order) { } | |
291 | #endif | |
cc102509 NP |
292 | #ifndef HAVE_ARCH_ALLOC_PAGE |
293 | static inline void arch_alloc_page(struct page *page, int order) { } | |
294 | #endif | |
1da177e4 | 295 | |
e4048e5d | 296 | struct page * |
d239171e | 297 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, |
e4048e5d KM |
298 | struct zonelist *zonelist, nodemask_t *nodemask); |
299 | ||
300 | static inline struct page * | |
301 | __alloc_pages(gfp_t gfp_mask, unsigned int order, | |
302 | struct zonelist *zonelist) | |
303 | { | |
d239171e | 304 | return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL); |
e4048e5d KM |
305 | } |
306 | ||
dd0fc66f | 307 | static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
1da177e4 LT |
308 | unsigned int order) |
309 | { | |
819a6928 AK |
310 | /* Unknown node is current node */ |
311 | if (nid < 0) | |
312 | nid = numa_node_id(); | |
313 | ||
0e88460d | 314 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); |
1da177e4 LT |
315 | } |
316 | ||
6484eb3e MG |
317 | static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask, |
318 | unsigned int order) | |
319 | { | |
f6d7e0cb | 320 | VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES || !node_online(nid)); |
6484eb3e MG |
321 | |
322 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); | |
323 | } | |
324 | ||
1da177e4 | 325 | #ifdef CONFIG_NUMA |
dd0fc66f | 326 | extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
1da177e4 LT |
327 | |
328 | static inline struct page * | |
dd0fc66f | 329 | alloc_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 | 330 | { |
1da177e4 LT |
331 | return alloc_pages_current(gfp_mask, order); |
332 | } | |
0bbbc0b3 | 333 | extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, |
2f5f9486 AK |
334 | struct vm_area_struct *vma, unsigned long addr, |
335 | int node); | |
1da177e4 LT |
336 | #else |
337 | #define alloc_pages(gfp_mask, order) \ | |
338 | alloc_pages_node(numa_node_id(), gfp_mask, order) | |
2f5f9486 | 339 | #define alloc_pages_vma(gfp_mask, order, vma, addr, node) \ |
0bbbc0b3 | 340 | alloc_pages(gfp_mask, order) |
1da177e4 LT |
341 | #endif |
342 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) | |
2f5f9486 AK |
343 | #define alloc_page_vma(gfp_mask, vma, addr) \ |
344 | alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id()) | |
236344d6 AK |
345 | #define alloc_page_vma_node(gfp_mask, vma, addr, node) \ |
346 | alloc_pages_vma(gfp_mask, 0, vma, addr, node) | |
1da177e4 | 347 | |
b3c97528 HH |
348 | extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); |
349 | extern unsigned long get_zeroed_page(gfp_t gfp_mask); | |
1da177e4 | 350 | |
2be0ffe2 TT |
351 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask); |
352 | void free_pages_exact(void *virt, size_t size); | |
ee85c2e1 AK |
353 | /* This is different from alloc_pages_exact_node !!! */ |
354 | void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); | |
2be0ffe2 | 355 | |
1da177e4 | 356 | #define __get_free_page(gfp_mask) \ |
fd23855e | 357 | __get_free_pages((gfp_mask), 0) |
1da177e4 LT |
358 | |
359 | #define __get_dma_pages(gfp_mask, order) \ | |
fd23855e | 360 | __get_free_pages((gfp_mask) | GFP_DMA, (order)) |
1da177e4 | 361 | |
b3c97528 HH |
362 | extern void __free_pages(struct page *page, unsigned int order); |
363 | extern void free_pages(unsigned long addr, unsigned int order); | |
fc91668e | 364 | extern void free_hot_cold_page(struct page *page, int cold); |
cc59850e | 365 | extern void free_hot_cold_page_list(struct list_head *list, int cold); |
1da177e4 LT |
366 | |
367 | #define __free_page(page) __free_pages((page), 0) | |
fd23855e | 368 | #define free_page(addr) free_pages((addr), 0) |
1da177e4 LT |
369 | |
370 | void page_alloc_init(void); | |
4037d452 | 371 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); |
9f8f2172 CL |
372 | void drain_all_pages(void); |
373 | void drain_local_pages(void *dummy); | |
1da177e4 | 374 | |
f90ac398 MG |
375 | /* |
376 | * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what | |
377 | * GFP flags are used before interrupts are enabled. Once interrupts are | |
378 | * enabled, it is set to __GFP_BITS_MASK while the system is running. During | |
379 | * hibernation, it is used by PM to avoid I/O during memory allocation while | |
380 | * devices are suspended. | |
381 | */ | |
dcce284a BH |
382 | extern gfp_t gfp_allowed_mask; |
383 | ||
c93bdd0e MG |
384 | /* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */ |
385 | bool gfp_pfmemalloc_allowed(gfp_t gfp_mask); | |
386 | ||
c9e664f1 RW |
387 | extern void pm_restrict_gfp_mask(void); |
388 | extern void pm_restore_gfp_mask(void); | |
dcce284a | 389 | |
f90ac398 MG |
390 | #ifdef CONFIG_PM_SLEEP |
391 | extern bool pm_suspended_storage(void); | |
392 | #else | |
393 | static inline bool pm_suspended_storage(void) | |
394 | { | |
395 | return false; | |
396 | } | |
397 | #endif /* CONFIG_PM_SLEEP */ | |
398 | ||
041d3a8c MN |
399 | #ifdef CONFIG_CMA |
400 | ||
401 | /* The below functions must be run on a range from a single zone. */ | |
0815f3d8 MN |
402 | extern int alloc_contig_range(unsigned long start, unsigned long end, |
403 | unsigned migratetype); | |
041d3a8c MN |
404 | extern void free_contig_range(unsigned long pfn, unsigned nr_pages); |
405 | ||
47118af0 MN |
406 | /* CMA stuff */ |
407 | extern void init_cma_reserved_pageblock(struct page *page); | |
408 | ||
041d3a8c MN |
409 | #endif |
410 | ||
1da177e4 | 411 | #endif /* __LINUX_GFP_H */ |