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mm: unify checks in alloc_pages_node() and __alloc_pages_node()
[mirror_ubuntu-bionic-kernel.git] / include / linux / gfp.h
CommitLineData
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
10struct 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
8f4fc071 33#define ___GFP_NOACCOUNT 0x100000u
caf49191
LT
34#define ___GFP_NOTRACK 0x200000u
35#define ___GFP_NO_KSWAPD 0x400000u
36#define ___GFP_OTHER_NODE 0x800000u
37#define ___GFP_WRITE 0x1000000u
05b0afd7 38/* If the above are modified, __GFP_BITS_SHIFT may need updating */
16b56cf4 39
1da177e4
LT
40/*
41 * GFP bitmasks..
e53ef38d
CL
42 *
43 * Zone modifiers (see linux/mmzone.h - low three bits)
44 *
e53ef38d 45 * Do not put any conditional on these. If necessary modify the definitions
263ff5d8 46 * without the underscores and use them consistently. The definitions here may
e53ef38d 47 * be used in bit comparisons.
1da177e4 48 */
16b56cf4
NK
49#define __GFP_DMA ((__force gfp_t)___GFP_DMA)
50#define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM)
51#define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32)
52#define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* Page is movable */
b70d94ee 53#define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE)
1da177e4
LT
54/*
55 * Action modifiers - doesn't change the zoning
56 *
57 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
58 * _might_ fail. This depends upon the particular VM implementation.
59 *
60 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
64775719
MH
61 * cannot handle allocation failures. New users should be evaluated carefully
62 * (and the flag should be used only when there is no reasonable failure policy)
63 * but it is definitely preferable to use the flag rather than opencode endless
64 * loop around allocator.
1da177e4 65 *
28c015d0
DR
66 * __GFP_NORETRY: The VM implementation must not retry indefinitely and will
67 * return NULL when direct reclaim and memory compaction have failed to allow
68 * the allocation to succeed. The OOM killer is not called with the current
69 * implementation.
769848c0
MG
70 *
71 * __GFP_MOVABLE: Flag that this page will be movable by the page migration
72 * mechanism or reclaimed
1da177e4 73 */
16b56cf4
NK
74#define __GFP_WAIT ((__force gfp_t)___GFP_WAIT) /* Can wait and reschedule? */
75#define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) /* Should access emergency pools? */
76#define __GFP_IO ((__force gfp_t)___GFP_IO) /* Can start physical IO? */
77#define __GFP_FS ((__force gfp_t)___GFP_FS) /* Can call down to low-level FS? */
78#define __GFP_COLD ((__force gfp_t)___GFP_COLD) /* Cache-cold page required */
79#define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) /* Suppress page allocation failure warning */
80#define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) /* See above */
81#define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) /* See above */
82#define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */
b37f1dd0 83#define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC)/* Allow access to emergency reserves */
16b56cf4
NK
84#define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */
85#define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */
b37f1dd0
MG
86#define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves.
87 * This takes precedence over the
88 * __GFP_MEMALLOC flag if both are
89 * set
90 */
16b56cf4
NK
91#define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */
92#define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */
93#define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */
8f4fc071 94#define __GFP_NOACCOUNT ((__force gfp_t)___GFP_NOACCOUNT) /* Don't account to kmemcg */
16b56cf4 95#define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */
1da177e4 96
caf49191 97#define __GFP_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD)
78afd561 98#define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */
a756cf59 99#define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to dirty page */
32dba98e 100
2dff4405
VN
101/*
102 * This may seem redundant, but it's a way of annotating false positives vs.
103 * allocations that simply cannot be supported (e.g. page tables).
104 */
105#define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)
106
caf49191 107#define __GFP_BITS_SHIFT 25 /* Room for N __GFP_FOO bits */
af4ca457 108#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
1da177e4 109
7b04d717
JD
110/* This equals 0, but use constants in case they ever change */
111#define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
4eac915d 112/* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
1da177e4
LT
113#define GFP_ATOMIC (__GFP_HIGH)
114#define GFP_NOIO (__GFP_WAIT)
115#define GFP_NOFS (__GFP_WAIT | __GFP_IO)
116#define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
e12ba74d
MG
117#define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \
118 __GFP_RECLAIMABLE)
f90b1d2f 119#define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
2d48366b
JZ
120#define GFP_HIGHUSER (GFP_USER | __GFP_HIGHMEM)
121#define GFP_HIGHUSER_MOVABLE (GFP_HIGHUSER | __GFP_MOVABLE)
452aa699 122#define GFP_IOFS (__GFP_IO | __GFP_FS)
71e3aac0 123#define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \
caf49191
LT
124 __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \
125 __GFP_NO_KSWAPD)
1da177e4 126
6cb06229 127/* This mask makes up all the page movable related flags */
e12ba74d 128#define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)
6cb06229
CL
129
130/* Control page allocator reclaim behavior */
131#define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\
132 __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
b37f1dd0 133 __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC)
6cb06229 134
7e85ee0c 135/* Control slab gfp mask during early boot */
fd23855e 136#define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS))
7e85ee0c 137
6cb06229
CL
138/* Control allocation constraints */
139#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
140
141/* Do not use these with a slab allocator */
142#define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
980128f2 143
1da177e4
LT
144/* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
145 platforms, used as appropriate on others */
146
147#define GFP_DMA __GFP_DMA
148
a2f1b424
AK
149/* 4GB DMA on some platforms */
150#define GFP_DMA32 __GFP_DMA32
151
467c996c 152/* Convert GFP flags to their corresponding migrate type */
43e7a34d 153static inline int gfpflags_to_migratetype(const gfp_t gfp_flags)
467c996c
MG
154{
155 WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
156
157 if (unlikely(page_group_by_mobility_disabled))
158 return MIGRATE_UNMOVABLE;
159
160 /* Group based on mobility */
161 return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) |
162 ((gfp_flags & __GFP_RECLAIMABLE) != 0);
163}
a2f1b424 164
b70d94ee
CL
165#ifdef CONFIG_HIGHMEM
166#define OPT_ZONE_HIGHMEM ZONE_HIGHMEM
167#else
168#define OPT_ZONE_HIGHMEM ZONE_NORMAL
169#endif
170
4b51d669 171#ifdef CONFIG_ZONE_DMA
b70d94ee
CL
172#define OPT_ZONE_DMA ZONE_DMA
173#else
174#define OPT_ZONE_DMA ZONE_NORMAL
4b51d669 175#endif
b70d94ee 176
4e4785bc 177#ifdef CONFIG_ZONE_DMA32
b70d94ee
CL
178#define OPT_ZONE_DMA32 ZONE_DMA32
179#else
180#define OPT_ZONE_DMA32 ZONE_NORMAL
4e4785bc 181#endif
b70d94ee
CL
182
183/*
184 * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the
185 * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long
186 * and there are 16 of them to cover all possible combinations of
263ff5d8 187 * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM.
b70d94ee
CL
188 *
189 * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA.
190 * But GFP_MOVABLE is not only a zone specifier but also an allocation
191 * policy. Therefore __GFP_MOVABLE plus another zone selector is valid.
263ff5d8 192 * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1".
b70d94ee
CL
193 *
194 * bit result
195 * =================
196 * 0x0 => NORMAL
197 * 0x1 => DMA or NORMAL
198 * 0x2 => HIGHMEM or NORMAL
199 * 0x3 => BAD (DMA+HIGHMEM)
200 * 0x4 => DMA32 or DMA or NORMAL
201 * 0x5 => BAD (DMA+DMA32)
202 * 0x6 => BAD (HIGHMEM+DMA32)
203 * 0x7 => BAD (HIGHMEM+DMA32+DMA)
204 * 0x8 => NORMAL (MOVABLE+0)
205 * 0x9 => DMA or NORMAL (MOVABLE+DMA)
206 * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too)
207 * 0xb => BAD (MOVABLE+HIGHMEM+DMA)
537926ca 208 * 0xc => DMA32 (MOVABLE+DMA32)
b70d94ee
CL
209 * 0xd => BAD (MOVABLE+DMA32+DMA)
210 * 0xe => BAD (MOVABLE+DMA32+HIGHMEM)
211 * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA)
212 *
213 * ZONES_SHIFT must be <= 2 on 32 bit platforms.
214 */
215
216#if 16 * ZONES_SHIFT > BITS_PER_LONG
217#error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer
218#endif
219
220#define GFP_ZONE_TABLE ( \
16b56cf4
NK
221 (ZONE_NORMAL << 0 * ZONES_SHIFT) \
222 | (OPT_ZONE_DMA << ___GFP_DMA * ZONES_SHIFT) \
223 | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * ZONES_SHIFT) \
224 | (OPT_ZONE_DMA32 << ___GFP_DMA32 * ZONES_SHIFT) \
225 | (ZONE_NORMAL << ___GFP_MOVABLE * ZONES_SHIFT) \
226 | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * ZONES_SHIFT) \
227 | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * ZONES_SHIFT) \
228 | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * ZONES_SHIFT) \
b70d94ee
CL
229)
230
231/*
263ff5d8 232 * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32
b70d94ee
CL
233 * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per
234 * entry starting with bit 0. Bit is set if the combination is not
235 * allowed.
236 */
237#define GFP_ZONE_BAD ( \
16b56cf4
NK
238 1 << (___GFP_DMA | ___GFP_HIGHMEM) \
239 | 1 << (___GFP_DMA | ___GFP_DMA32) \
240 | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \
241 | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \
242 | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \
243 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \
244 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \
245 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \
b70d94ee
CL
246)
247
248static inline enum zone_type gfp_zone(gfp_t flags)
249{
250 enum zone_type z;
16b56cf4 251 int bit = (__force int) (flags & GFP_ZONEMASK);
b70d94ee
CL
252
253 z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) &
254 ((1 << ZONES_SHIFT) - 1);
82d4b577 255 VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1);
b70d94ee 256 return z;
4e4785bc
CL
257}
258
1da177e4
LT
259/*
260 * There is only one page-allocator function, and two main namespaces to
261 * it. The alloc_page*() variants return 'struct page *' and as such
262 * can allocate highmem pages, the *get*page*() variants return
263 * virtual kernel addresses to the allocated page(s).
264 */
265
54a6eb5c
MG
266static inline int gfp_zonelist(gfp_t flags)
267{
e5adfffc 268 if (IS_ENABLED(CONFIG_NUMA) && unlikely(flags & __GFP_THISNODE))
54a6eb5c
MG
269 return 1;
270
271 return 0;
272}
273
1da177e4
LT
274/*
275 * We get the zone list from the current node and the gfp_mask.
276 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
54a6eb5c
MG
277 * There are two zonelists per node, one for all zones with memory and
278 * one containing just zones from the node the zonelist belongs to.
1da177e4
LT
279 *
280 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
281 * optimized to &contig_page_data at compile-time.
282 */
0e88460d
MG
283static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
284{
54a6eb5c 285 return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags);
0e88460d 286}
1da177e4
LT
287
288#ifndef HAVE_ARCH_FREE_PAGE
289static inline void arch_free_page(struct page *page, int order) { }
290#endif
cc102509
NP
291#ifndef HAVE_ARCH_ALLOC_PAGE
292static inline void arch_alloc_page(struct page *page, int order) { }
293#endif
1da177e4 294
e4048e5d 295struct page *
d239171e 296__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
e4048e5d
KM
297 struct zonelist *zonelist, nodemask_t *nodemask);
298
299static inline struct page *
300__alloc_pages(gfp_t gfp_mask, unsigned int order,
301 struct zonelist *zonelist)
302{
d239171e 303 return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL);
e4048e5d
KM
304}
305
96db800f
VB
306/*
307 * Allocate pages, preferring the node given as nid. The node must be valid and
308 * online. For more general interface, see alloc_pages_node().
309 */
310static inline struct page *
311__alloc_pages_node(int nid, gfp_t gfp_mask, unsigned int order)
1da177e4 312{
0bc35a97
VB
313 VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES);
314 VM_WARN_ON(!node_online(nid));
819a6928 315
0e88460d 316 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
1da177e4
LT
317}
318
96db800f
VB
319/*
320 * Allocate pages, preferring the node given as nid. When nid == NUMA_NO_NODE,
0bc35a97 321 * prefer the current CPU's node. Otherwise node must be valid and online.
96db800f
VB
322 */
323static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
6484eb3e
MG
324 unsigned int order)
325{
0bc35a97 326 if (nid == NUMA_NO_NODE)
96db800f 327 nid = numa_node_id();
6484eb3e 328
0bc35a97 329 return __alloc_pages_node(nid, gfp_mask, order);
6484eb3e
MG
330}
331
1da177e4 332#ifdef CONFIG_NUMA
dd0fc66f 333extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
1da177e4
LT
334
335static inline struct page *
dd0fc66f 336alloc_pages(gfp_t gfp_mask, unsigned int order)
1da177e4 337{
1da177e4
LT
338 return alloc_pages_current(gfp_mask, order);
339}
0bbbc0b3 340extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order,
2f5f9486 341 struct vm_area_struct *vma, unsigned long addr,
be97a41b
VB
342 int node, bool hugepage);
343#define alloc_hugepage_vma(gfp_mask, vma, addr, order) \
344 alloc_pages_vma(gfp_mask, order, vma, addr, numa_node_id(), true)
1da177e4
LT
345#else
346#define alloc_pages(gfp_mask, order) \
347 alloc_pages_node(numa_node_id(), gfp_mask, order)
be97a41b 348#define alloc_pages_vma(gfp_mask, order, vma, addr, node, false)\
0bbbc0b3 349 alloc_pages(gfp_mask, order)
077fcf11
AK
350#define alloc_hugepage_vma(gfp_mask, vma, addr, order) \
351 alloc_pages(gfp_mask, order)
1da177e4
LT
352#endif
353#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
2f5f9486 354#define alloc_page_vma(gfp_mask, vma, addr) \
be97a41b 355 alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id(), false)
236344d6 356#define alloc_page_vma_node(gfp_mask, vma, addr, node) \
be97a41b 357 alloc_pages_vma(gfp_mask, 0, vma, addr, node, false)
1da177e4 358
52383431
VD
359extern struct page *alloc_kmem_pages(gfp_t gfp_mask, unsigned int order);
360extern struct page *alloc_kmem_pages_node(int nid, gfp_t gfp_mask,
361 unsigned int order);
362
b3c97528
HH
363extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
364extern unsigned long get_zeroed_page(gfp_t gfp_mask);
1da177e4 365
2be0ffe2
TT
366void *alloc_pages_exact(size_t size, gfp_t gfp_mask);
367void free_pages_exact(void *virt, size_t size);
e1931811 368void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask);
2be0ffe2 369
1da177e4 370#define __get_free_page(gfp_mask) \
fd23855e 371 __get_free_pages((gfp_mask), 0)
1da177e4
LT
372
373#define __get_dma_pages(gfp_mask, order) \
fd23855e 374 __get_free_pages((gfp_mask) | GFP_DMA, (order))
1da177e4 375
b3c97528
HH
376extern void __free_pages(struct page *page, unsigned int order);
377extern void free_pages(unsigned long addr, unsigned int order);
b745bc85
MG
378extern void free_hot_cold_page(struct page *page, bool cold);
379extern void free_hot_cold_page_list(struct list_head *list, bool cold);
1da177e4 380
b63ae8ca
AD
381struct page_frag_cache;
382extern void *__alloc_page_frag(struct page_frag_cache *nc,
383 unsigned int fragsz, gfp_t gfp_mask);
384extern void __free_page_frag(void *addr);
385
52383431
VD
386extern void __free_kmem_pages(struct page *page, unsigned int order);
387extern void free_kmem_pages(unsigned long addr, unsigned int order);
6a1a0d3b 388
1da177e4 389#define __free_page(page) __free_pages((page), 0)
fd23855e 390#define free_page(addr) free_pages((addr), 0)
1da177e4
LT
391
392void page_alloc_init(void);
4037d452 393void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
93481ff0
VB
394void drain_all_pages(struct zone *zone);
395void drain_local_pages(struct zone *zone);
1da177e4 396
0e1cc95b
MG
397#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
398void page_alloc_init_late(void);
399#else
400static inline void page_alloc_init_late(void)
401{
402}
403#endif
404
f90ac398
MG
405/*
406 * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what
407 * GFP flags are used before interrupts are enabled. Once interrupts are
408 * enabled, it is set to __GFP_BITS_MASK while the system is running. During
409 * hibernation, it is used by PM to avoid I/O during memory allocation while
410 * devices are suspended.
411 */
dcce284a
BH
412extern gfp_t gfp_allowed_mask;
413
c93bdd0e
MG
414/* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */
415bool gfp_pfmemalloc_allowed(gfp_t gfp_mask);
416
c9e664f1
RW
417extern void pm_restrict_gfp_mask(void);
418extern void pm_restore_gfp_mask(void);
dcce284a 419
f90ac398
MG
420#ifdef CONFIG_PM_SLEEP
421extern bool pm_suspended_storage(void);
422#else
423static inline bool pm_suspended_storage(void)
424{
425 return false;
426}
427#endif /* CONFIG_PM_SLEEP */
428
041d3a8c
MN
429#ifdef CONFIG_CMA
430
431/* The below functions must be run on a range from a single zone. */
0815f3d8
MN
432extern int alloc_contig_range(unsigned long start, unsigned long end,
433 unsigned migratetype);
041d3a8c
MN
434extern void free_contig_range(unsigned long pfn, unsigned nr_pages);
435
47118af0
MN
436/* CMA stuff */
437extern void init_cma_reserved_pageblock(struct page *page);
438
041d3a8c
MN
439#endif
440
1da177e4 441#endif /* __LINUX_GFP_H */