]>
Commit | Line | Data |
---|---|---|
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> |
6484eb3e | 9 | #include <linux/mmdebug.h> |
1da177e4 LT |
10 | |
11 | struct vm_area_struct; | |
12 | ||
16b56cf4 NK |
13 | /* Plain integer GFP bitmasks. Do not use this directly. */ |
14 | #define ___GFP_DMA 0x01u | |
15 | #define ___GFP_HIGHMEM 0x02u | |
16 | #define ___GFP_DMA32 0x04u | |
17 | #define ___GFP_MOVABLE 0x08u | |
18 | #define ___GFP_WAIT 0x10u | |
19 | #define ___GFP_HIGH 0x20u | |
20 | #define ___GFP_IO 0x40u | |
21 | #define ___GFP_FS 0x80u | |
22 | #define ___GFP_COLD 0x100u | |
23 | #define ___GFP_NOWARN 0x200u | |
24 | #define ___GFP_REPEAT 0x400u | |
25 | #define ___GFP_NOFAIL 0x800u | |
26 | #define ___GFP_NORETRY 0x1000u | |
b37f1dd0 | 27 | #define ___GFP_MEMALLOC 0x2000u |
16b56cf4 NK |
28 | #define ___GFP_COMP 0x4000u |
29 | #define ___GFP_ZERO 0x8000u | |
30 | #define ___GFP_NOMEMALLOC 0x10000u | |
31 | #define ___GFP_HARDWALL 0x20000u | |
32 | #define ___GFP_THISNODE 0x40000u | |
33 | #define ___GFP_RECLAIMABLE 0x80000u | |
7a64bf05 | 34 | #define ___GFP_KMEMCG 0x100000u |
caf49191 LT |
35 | #define ___GFP_NOTRACK 0x200000u |
36 | #define ___GFP_NO_KSWAPD 0x400000u | |
37 | #define ___GFP_OTHER_NODE 0x800000u | |
38 | #define ___GFP_WRITE 0x1000000u | |
05b0afd7 | 39 | /* If the above are modified, __GFP_BITS_SHIFT may need updating */ |
16b56cf4 | 40 | |
1da177e4 LT |
41 | /* |
42 | * GFP bitmasks.. | |
e53ef38d CL |
43 | * |
44 | * Zone modifiers (see linux/mmzone.h - low three bits) | |
45 | * | |
e53ef38d | 46 | * Do not put any conditional on these. If necessary modify the definitions |
263ff5d8 | 47 | * without the underscores and use them consistently. The definitions here may |
e53ef38d | 48 | * be used in bit comparisons. |
1da177e4 | 49 | */ |
16b56cf4 NK |
50 | #define __GFP_DMA ((__force gfp_t)___GFP_DMA) |
51 | #define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM) | |
52 | #define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32) | |
53 | #define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* Page is movable */ | |
b70d94ee | 54 | #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) |
1da177e4 LT |
55 | /* |
56 | * Action modifiers - doesn't change the zoning | |
57 | * | |
58 | * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt | |
59 | * _might_ fail. This depends upon the particular VM implementation. | |
60 | * | |
61 | * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller | |
478352e7 DR |
62 | * cannot handle allocation failures. This modifier is deprecated and no new |
63 | * users should be added. | |
1da177e4 LT |
64 | * |
65 | * __GFP_NORETRY: The VM implementation must not retry indefinitely. | |
769848c0 MG |
66 | * |
67 | * __GFP_MOVABLE: Flag that this page will be movable by the page migration | |
68 | * mechanism or reclaimed | |
1da177e4 | 69 | */ |
16b56cf4 NK |
70 | #define __GFP_WAIT ((__force gfp_t)___GFP_WAIT) /* Can wait and reschedule? */ |
71 | #define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) /* Should access emergency pools? */ | |
72 | #define __GFP_IO ((__force gfp_t)___GFP_IO) /* Can start physical IO? */ | |
73 | #define __GFP_FS ((__force gfp_t)___GFP_FS) /* Can call down to low-level FS? */ | |
74 | #define __GFP_COLD ((__force gfp_t)___GFP_COLD) /* Cache-cold page required */ | |
75 | #define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) /* Suppress page allocation failure warning */ | |
76 | #define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) /* See above */ | |
77 | #define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) /* See above */ | |
78 | #define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */ | |
b37f1dd0 | 79 | #define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC)/* Allow access to emergency reserves */ |
16b56cf4 NK |
80 | #define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */ |
81 | #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */ | |
b37f1dd0 MG |
82 | #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves. |
83 | * This takes precedence over the | |
84 | * __GFP_MEMALLOC flag if both are | |
85 | * set | |
86 | */ | |
16b56cf4 NK |
87 | #define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */ |
88 | #define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */ | |
89 | #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */ | |
90 | #define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */ | |
1da177e4 | 91 | |
caf49191 | 92 | #define __GFP_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD) |
78afd561 | 93 | #define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */ |
7a64bf05 | 94 | #define __GFP_KMEMCG ((__force gfp_t)___GFP_KMEMCG) /* Allocation comes from a memcg-accounted resource */ |
a756cf59 | 95 | #define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to dirty page */ |
32dba98e | 96 | |
2dff4405 VN |
97 | /* |
98 | * This may seem redundant, but it's a way of annotating false positives vs. | |
99 | * allocations that simply cannot be supported (e.g. page tables). | |
100 | */ | |
101 | #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK) | |
102 | ||
caf49191 | 103 | #define __GFP_BITS_SHIFT 25 /* Room for N __GFP_FOO bits */ |
af4ca457 | 104 | #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
1da177e4 | 105 | |
7b04d717 JD |
106 | /* This equals 0, but use constants in case they ever change */ |
107 | #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) | |
4eac915d | 108 | /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ |
1da177e4 LT |
109 | #define GFP_ATOMIC (__GFP_HIGH) |
110 | #define GFP_NOIO (__GFP_WAIT) | |
111 | #define GFP_NOFS (__GFP_WAIT | __GFP_IO) | |
112 | #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) | |
e12ba74d MG |
113 | #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
114 | __GFP_RECLAIMABLE) | |
f90b1d2f PJ |
115 | #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
116 | #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ | |
117 | __GFP_HIGHMEM) | |
769848c0 MG |
118 | #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
119 | __GFP_HARDWALL | __GFP_HIGHMEM | \ | |
120 | __GFP_MOVABLE) | |
452aa699 | 121 | #define GFP_IOFS (__GFP_IO | __GFP_FS) |
71e3aac0 | 122 | #define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ |
caf49191 LT |
123 | __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \ |
124 | __GFP_NO_KSWAPD) | |
1da177e4 | 125 | |
77f700da | 126 | #ifdef CONFIG_NUMA |
980128f2 | 127 | #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) |
77f700da | 128 | #else |
f2e97df6 | 129 | #define GFP_THISNODE ((__force gfp_t)0) |
77f700da CL |
130 | #endif |
131 | ||
6cb06229 | 132 | /* This mask makes up all the page movable related flags */ |
e12ba74d | 133 | #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) |
6cb06229 CL |
134 | |
135 | /* Control page allocator reclaim behavior */ | |
136 | #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ | |
137 | __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ | |
b37f1dd0 | 138 | __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC) |
6cb06229 | 139 | |
7e85ee0c | 140 | /* Control slab gfp mask during early boot */ |
fd23855e | 141 | #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)) |
7e85ee0c | 142 | |
6cb06229 CL |
143 | /* Control allocation constraints */ |
144 | #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) | |
145 | ||
146 | /* Do not use these with a slab allocator */ | |
147 | #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) | |
980128f2 | 148 | |
1da177e4 LT |
149 | /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some |
150 | platforms, used as appropriate on others */ | |
151 | ||
152 | #define GFP_DMA __GFP_DMA | |
153 | ||
a2f1b424 AK |
154 | /* 4GB DMA on some platforms */ |
155 | #define GFP_DMA32 __GFP_DMA32 | |
156 | ||
467c996c MG |
157 | /* Convert GFP flags to their corresponding migrate type */ |
158 | static inline int allocflags_to_migratetype(gfp_t gfp_flags) | |
159 | { | |
160 | WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); | |
161 | ||
162 | if (unlikely(page_group_by_mobility_disabled)) | |
163 | return MIGRATE_UNMOVABLE; | |
164 | ||
165 | /* Group based on mobility */ | |
166 | return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | | |
167 | ((gfp_flags & __GFP_RECLAIMABLE) != 0); | |
168 | } | |
a2f1b424 | 169 | |
b70d94ee CL |
170 | #ifdef CONFIG_HIGHMEM |
171 | #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM | |
172 | #else | |
173 | #define OPT_ZONE_HIGHMEM ZONE_NORMAL | |
174 | #endif | |
175 | ||
4b51d669 | 176 | #ifdef CONFIG_ZONE_DMA |
b70d94ee CL |
177 | #define OPT_ZONE_DMA ZONE_DMA |
178 | #else | |
179 | #define OPT_ZONE_DMA ZONE_NORMAL | |
4b51d669 | 180 | #endif |
b70d94ee | 181 | |
4e4785bc | 182 | #ifdef CONFIG_ZONE_DMA32 |
b70d94ee CL |
183 | #define OPT_ZONE_DMA32 ZONE_DMA32 |
184 | #else | |
185 | #define OPT_ZONE_DMA32 ZONE_NORMAL | |
4e4785bc | 186 | #endif |
b70d94ee CL |
187 | |
188 | /* | |
189 | * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the | |
190 | * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long | |
191 | * and there are 16 of them to cover all possible combinations of | |
263ff5d8 | 192 | * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM. |
b70d94ee CL |
193 | * |
194 | * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. | |
195 | * But GFP_MOVABLE is not only a zone specifier but also an allocation | |
196 | * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. | |
263ff5d8 | 197 | * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1". |
b70d94ee CL |
198 | * |
199 | * bit result | |
200 | * ================= | |
201 | * 0x0 => NORMAL | |
202 | * 0x1 => DMA or NORMAL | |
203 | * 0x2 => HIGHMEM or NORMAL | |
204 | * 0x3 => BAD (DMA+HIGHMEM) | |
205 | * 0x4 => DMA32 or DMA or NORMAL | |
206 | * 0x5 => BAD (DMA+DMA32) | |
207 | * 0x6 => BAD (HIGHMEM+DMA32) | |
208 | * 0x7 => BAD (HIGHMEM+DMA32+DMA) | |
209 | * 0x8 => NORMAL (MOVABLE+0) | |
210 | * 0x9 => DMA or NORMAL (MOVABLE+DMA) | |
211 | * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) | |
212 | * 0xb => BAD (MOVABLE+HIGHMEM+DMA) | |
537926ca | 213 | * 0xc => DMA32 (MOVABLE+DMA32) |
b70d94ee CL |
214 | * 0xd => BAD (MOVABLE+DMA32+DMA) |
215 | * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) | |
216 | * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) | |
217 | * | |
218 | * ZONES_SHIFT must be <= 2 on 32 bit platforms. | |
219 | */ | |
220 | ||
221 | #if 16 * ZONES_SHIFT > BITS_PER_LONG | |
222 | #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer | |
223 | #endif | |
224 | ||
225 | #define GFP_ZONE_TABLE ( \ | |
16b56cf4 NK |
226 | (ZONE_NORMAL << 0 * ZONES_SHIFT) \ |
227 | | (OPT_ZONE_DMA << ___GFP_DMA * ZONES_SHIFT) \ | |
228 | | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * ZONES_SHIFT) \ | |
229 | | (OPT_ZONE_DMA32 << ___GFP_DMA32 * ZONES_SHIFT) \ | |
230 | | (ZONE_NORMAL << ___GFP_MOVABLE * ZONES_SHIFT) \ | |
231 | | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * ZONES_SHIFT) \ | |
232 | | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * ZONES_SHIFT) \ | |
233 | | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * ZONES_SHIFT) \ | |
b70d94ee CL |
234 | ) |
235 | ||
236 | /* | |
263ff5d8 | 237 | * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32 |
b70d94ee CL |
238 | * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per |
239 | * entry starting with bit 0. Bit is set if the combination is not | |
240 | * allowed. | |
241 | */ | |
242 | #define GFP_ZONE_BAD ( \ | |
16b56cf4 NK |
243 | 1 << (___GFP_DMA | ___GFP_HIGHMEM) \ |
244 | | 1 << (___GFP_DMA | ___GFP_DMA32) \ | |
245 | | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \ | |
246 | | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \ | |
247 | | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \ | |
248 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \ | |
249 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \ | |
250 | | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \ | |
b70d94ee CL |
251 | ) |
252 | ||
253 | static inline enum zone_type gfp_zone(gfp_t flags) | |
254 | { | |
255 | enum zone_type z; | |
16b56cf4 | 256 | int bit = (__force int) (flags & GFP_ZONEMASK); |
b70d94ee CL |
257 | |
258 | z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) & | |
259 | ((1 << ZONES_SHIFT) - 1); | |
82d4b577 | 260 | VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1); |
b70d94ee | 261 | return z; |
4e4785bc CL |
262 | } |
263 | ||
1da177e4 LT |
264 | /* |
265 | * There is only one page-allocator function, and two main namespaces to | |
266 | * it. The alloc_page*() variants return 'struct page *' and as such | |
267 | * can allocate highmem pages, the *get*page*() variants return | |
268 | * virtual kernel addresses to the allocated page(s). | |
269 | */ | |
270 | ||
54a6eb5c MG |
271 | static inline int gfp_zonelist(gfp_t flags) |
272 | { | |
e5adfffc | 273 | if (IS_ENABLED(CONFIG_NUMA) && unlikely(flags & __GFP_THISNODE)) |
54a6eb5c MG |
274 | return 1; |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
1da177e4 LT |
279 | /* |
280 | * We get the zone list from the current node and the gfp_mask. | |
281 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. | |
54a6eb5c MG |
282 | * There are two zonelists per node, one for all zones with memory and |
283 | * one containing just zones from the node the zonelist belongs to. | |
1da177e4 LT |
284 | * |
285 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets | |
286 | * optimized to &contig_page_data at compile-time. | |
287 | */ | |
0e88460d MG |
288 | static inline struct zonelist *node_zonelist(int nid, gfp_t flags) |
289 | { | |
54a6eb5c | 290 | return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); |
0e88460d | 291 | } |
1da177e4 LT |
292 | |
293 | #ifndef HAVE_ARCH_FREE_PAGE | |
294 | static inline void arch_free_page(struct page *page, int order) { } | |
295 | #endif | |
cc102509 NP |
296 | #ifndef HAVE_ARCH_ALLOC_PAGE |
297 | static inline void arch_alloc_page(struct page *page, int order) { } | |
298 | #endif | |
1da177e4 | 299 | |
e4048e5d | 300 | struct page * |
d239171e | 301 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, |
e4048e5d KM |
302 | struct zonelist *zonelist, nodemask_t *nodemask); |
303 | ||
304 | static inline struct page * | |
305 | __alloc_pages(gfp_t gfp_mask, unsigned int order, | |
306 | struct zonelist *zonelist) | |
307 | { | |
d239171e | 308 | return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL); |
e4048e5d KM |
309 | } |
310 | ||
dd0fc66f | 311 | static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
1da177e4 LT |
312 | unsigned int order) |
313 | { | |
819a6928 AK |
314 | /* Unknown node is current node */ |
315 | if (nid < 0) | |
316 | nid = numa_node_id(); | |
317 | ||
0e88460d | 318 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); |
1da177e4 LT |
319 | } |
320 | ||
6484eb3e MG |
321 | static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask, |
322 | unsigned int order) | |
323 | { | |
f6d7e0cb | 324 | VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES || !node_online(nid)); |
6484eb3e MG |
325 | |
326 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); | |
327 | } | |
328 | ||
1da177e4 | 329 | #ifdef CONFIG_NUMA |
dd0fc66f | 330 | extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
1da177e4 LT |
331 | |
332 | static inline struct page * | |
dd0fc66f | 333 | alloc_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 | 334 | { |
1da177e4 LT |
335 | return alloc_pages_current(gfp_mask, order); |
336 | } | |
0bbbc0b3 | 337 | extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, |
2f5f9486 AK |
338 | struct vm_area_struct *vma, unsigned long addr, |
339 | int node); | |
1da177e4 LT |
340 | #else |
341 | #define alloc_pages(gfp_mask, order) \ | |
342 | alloc_pages_node(numa_node_id(), gfp_mask, order) | |
2f5f9486 | 343 | #define alloc_pages_vma(gfp_mask, order, vma, addr, node) \ |
0bbbc0b3 | 344 | alloc_pages(gfp_mask, order) |
1da177e4 LT |
345 | #endif |
346 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) | |
2f5f9486 AK |
347 | #define alloc_page_vma(gfp_mask, vma, addr) \ |
348 | alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id()) | |
236344d6 AK |
349 | #define alloc_page_vma_node(gfp_mask, vma, addr, node) \ |
350 | alloc_pages_vma(gfp_mask, 0, vma, addr, node) | |
1da177e4 | 351 | |
b3c97528 HH |
352 | extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); |
353 | extern unsigned long get_zeroed_page(gfp_t gfp_mask); | |
1da177e4 | 354 | |
2be0ffe2 TT |
355 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask); |
356 | void free_pages_exact(void *virt, size_t size); | |
ee85c2e1 AK |
357 | /* This is different from alloc_pages_exact_node !!! */ |
358 | void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); | |
2be0ffe2 | 359 | |
1da177e4 | 360 | #define __get_free_page(gfp_mask) \ |
fd23855e | 361 | __get_free_pages((gfp_mask), 0) |
1da177e4 LT |
362 | |
363 | #define __get_dma_pages(gfp_mask, order) \ | |
fd23855e | 364 | __get_free_pages((gfp_mask) | GFP_DMA, (order)) |
1da177e4 | 365 | |
b3c97528 HH |
366 | extern void __free_pages(struct page *page, unsigned int order); |
367 | extern void free_pages(unsigned long addr, unsigned int order); | |
fc91668e | 368 | extern void free_hot_cold_page(struct page *page, int cold); |
cc59850e | 369 | extern void free_hot_cold_page_list(struct list_head *list, int cold); |
1da177e4 | 370 | |
6a1a0d3b GC |
371 | extern void __free_memcg_kmem_pages(struct page *page, unsigned int order); |
372 | extern void free_memcg_kmem_pages(unsigned long addr, unsigned int order); | |
373 | ||
1da177e4 | 374 | #define __free_page(page) __free_pages((page), 0) |
fd23855e | 375 | #define free_page(addr) free_pages((addr), 0) |
1da177e4 LT |
376 | |
377 | void page_alloc_init(void); | |
4037d452 | 378 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); |
9f8f2172 CL |
379 | void drain_all_pages(void); |
380 | void drain_local_pages(void *dummy); | |
1da177e4 | 381 | |
f90ac398 MG |
382 | /* |
383 | * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what | |
384 | * GFP flags are used before interrupts are enabled. Once interrupts are | |
385 | * enabled, it is set to __GFP_BITS_MASK while the system is running. During | |
386 | * hibernation, it is used by PM to avoid I/O during memory allocation while | |
387 | * devices are suspended. | |
388 | */ | |
dcce284a BH |
389 | extern gfp_t gfp_allowed_mask; |
390 | ||
c93bdd0e MG |
391 | /* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */ |
392 | bool gfp_pfmemalloc_allowed(gfp_t gfp_mask); | |
393 | ||
c9e664f1 RW |
394 | extern void pm_restrict_gfp_mask(void); |
395 | extern void pm_restore_gfp_mask(void); | |
dcce284a | 396 | |
f90ac398 MG |
397 | #ifdef CONFIG_PM_SLEEP |
398 | extern bool pm_suspended_storage(void); | |
399 | #else | |
400 | static inline bool pm_suspended_storage(void) | |
401 | { | |
402 | return false; | |
403 | } | |
404 | #endif /* CONFIG_PM_SLEEP */ | |
405 | ||
041d3a8c MN |
406 | #ifdef CONFIG_CMA |
407 | ||
408 | /* The below functions must be run on a range from a single zone. */ | |
0815f3d8 MN |
409 | extern int alloc_contig_range(unsigned long start, unsigned long end, |
410 | unsigned migratetype); | |
041d3a8c MN |
411 | extern void free_contig_range(unsigned long pfn, unsigned nr_pages); |
412 | ||
47118af0 MN |
413 | /* CMA stuff */ |
414 | extern void init_cma_reserved_pageblock(struct page *page); | |
415 | ||
041d3a8c MN |
416 | #endif |
417 | ||
1da177e4 | 418 | #endif /* __LINUX_GFP_H */ |