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Linux/include/linux/gfp.h

  1 #ifndef __LINUX_GFP_H
  2 #define __LINUX_GFP_H
  3 
  4 #include <linux/mmdebug.h>
  5 #include <linux/mmzone.h>
  6 #include <linux/stddef.h>
  7 #include <linux/linkage.h>
  8 #include <linux/topology.h>
  9 
 10 struct vm_area_struct;
 11 
 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_RECLAIMABLE      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
 26 #define ___GFP_MEMALLOC         0x2000u
 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_ATOMIC           0x80000u
 33 #define ___GFP_ACCOUNT          0x100000u
 34 #define ___GFP_NOTRACK          0x200000u
 35 #define ___GFP_DIRECT_RECLAIM   0x400000u
 36 #define ___GFP_OTHER_NODE       0x800000u
 37 #define ___GFP_WRITE            0x1000000u
 38 #define ___GFP_KSWAPD_RECLAIM   0x2000000u
 39 /* If the above are modified, __GFP_BITS_SHIFT may need updating */
 40 
 41 /*
 42  * Physical address zone modifiers (see linux/mmzone.h - low four bits)
 43  *
 44  * Do not put any conditional on these. If necessary modify the definitions
 45  * without the underscores and use them consistently. The definitions here may
 46  * be used in bit comparisons.
 47  */
 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 */
 52 #define __GFP_MOVABLE   ((__force gfp_t)___GFP_MOVABLE)  /* ZONE_MOVABLE allowed */
 53 #define GFP_ZONEMASK    (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE)
 54 
 55 /*
 56  * Page mobility and placement hints
 57  *
 58  * These flags provide hints about how mobile the page is. Pages with similar
 59  * mobility are placed within the same pageblocks to minimise problems due
 60  * to external fragmentation.
 61  *
 62  * __GFP_MOVABLE (also a zone modifier) indicates that the page can be
 63  *   moved by page migration during memory compaction or can be reclaimed.
 64  *
 65  * __GFP_RECLAIMABLE is used for slab allocations that specify
 66  *   SLAB_RECLAIM_ACCOUNT and whose pages can be freed via shrinkers.
 67  *
 68  * __GFP_WRITE indicates the caller intends to dirty the page. Where possible,
 69  *   these pages will be spread between local zones to avoid all the dirty
 70  *   pages being in one zone (fair zone allocation policy).
 71  *
 72  * __GFP_HARDWALL enforces the cpuset memory allocation policy.
 73  *
 74  * __GFP_THISNODE forces the allocation to be satisified from the requested
 75  *   node with no fallbacks or placement policy enforcements.
 76  *
 77  * __GFP_ACCOUNT causes the allocation to be accounted to kmemcg (only relevant
 78  *   to kmem allocations).
 79  */
 80 #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE)
 81 #define __GFP_WRITE     ((__force gfp_t)___GFP_WRITE)
 82 #define __GFP_HARDWALL   ((__force gfp_t)___GFP_HARDWALL)
 83 #define __GFP_THISNODE  ((__force gfp_t)___GFP_THISNODE)
 84 #define __GFP_ACCOUNT   ((__force gfp_t)___GFP_ACCOUNT)
 85 
 86 /*
 87  * Watermark modifiers -- controls access to emergency reserves
 88  *
 89  * __GFP_HIGH indicates that the caller is high-priority and that granting
 90  *   the request is necessary before the system can make forward progress.
 91  *   For example, creating an IO context to clean pages.
 92  *
 93  * __GFP_ATOMIC indicates that the caller cannot reclaim or sleep and is
 94  *   high priority. Users are typically interrupt handlers. This may be
 95  *   used in conjunction with __GFP_HIGH
 96  *
 97  * __GFP_MEMALLOC allows access to all memory. This should only be used when
 98  *   the caller guarantees the allocation will allow more memory to be freed
 99  *   very shortly e.g. process exiting or swapping. Users either should
100  *   be the MM or co-ordinating closely with the VM (e.g. swap over NFS).
101  *
102  * __GFP_NOMEMALLOC is used to explicitly forbid access to emergency reserves.
103  *   This takes precedence over the __GFP_MEMALLOC flag if both are set.
104  *
105  * __GFP_NOACCOUNT ignores the accounting for kmemcg limit enforcement.
106  */
107 #define __GFP_ATOMIC    ((__force gfp_t)___GFP_ATOMIC)
108 #define __GFP_HIGH      ((__force gfp_t)___GFP_HIGH)
109 #define __GFP_MEMALLOC  ((__force gfp_t)___GFP_MEMALLOC)
110 #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC)
111 
112 /*
113  * Reclaim modifiers
114  *
115  * __GFP_IO can start physical IO.
116  *
117  * __GFP_FS can call down to the low-level FS. Clearing the flag avoids the
118  *   allocator recursing into the filesystem which might already be holding
119  *   locks.
120  *
121  * __GFP_DIRECT_RECLAIM indicates that the caller may enter direct reclaim.
122  *   This flag can be cleared to avoid unnecessary delays when a fallback
123  *   option is available.
124  *
125  * __GFP_KSWAPD_RECLAIM indicates that the caller wants to wake kswapd when
126  *   the low watermark is reached and have it reclaim pages until the high
127  *   watermark is reached. A caller may wish to clear this flag when fallback
128  *   options are available and the reclaim is likely to disrupt the system. The
129  *   canonical example is THP allocation where a fallback is cheap but
130  *   reclaim/compaction may cause indirect stalls.
131  *
132  * __GFP_RECLAIM is shorthand to allow/forbid both direct and kswapd reclaim.
133  *
134  * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
135  *   _might_ fail.  This depends upon the particular VM implementation.
136  *
137  * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
138  *   cannot handle allocation failures. New users should be evaluated carefully
139  *   (and the flag should be used only when there is no reasonable failure
140  *   policy) but it is definitely preferable to use the flag rather than
141  *   opencode endless loop around allocator.
142  *
143  * __GFP_NORETRY: The VM implementation must not retry indefinitely and will
144  *   return NULL when direct reclaim and memory compaction have failed to allow
145  *   the allocation to succeed.  The OOM killer is not called with the current
146  *   implementation.
147  */
148 #define __GFP_IO        ((__force gfp_t)___GFP_IO)
149 #define __GFP_FS        ((__force gfp_t)___GFP_FS)
150 #define __GFP_DIRECT_RECLAIM    ((__force gfp_t)___GFP_DIRECT_RECLAIM) /* Caller can reclaim */
151 #define __GFP_KSWAPD_RECLAIM    ((__force gfp_t)___GFP_KSWAPD_RECLAIM) /* kswapd can wake */
152 #define __GFP_RECLAIM ((__force gfp_t)(___GFP_DIRECT_RECLAIM|___GFP_KSWAPD_RECLAIM))
153 #define __GFP_REPEAT    ((__force gfp_t)___GFP_REPEAT)
154 #define __GFP_NOFAIL    ((__force gfp_t)___GFP_NOFAIL)
155 #define __GFP_NORETRY   ((__force gfp_t)___GFP_NORETRY)
156 
157 /*
158  * Action modifiers
159  *
160  * __GFP_COLD indicates that the caller does not expect to be used in the near
161  *   future. Where possible, a cache-cold page will be returned.
162  *
163  * __GFP_NOWARN suppresses allocation failure reports.
164  *
165  * __GFP_COMP address compound page metadata.
166  *
167  * __GFP_ZERO returns a zeroed page on success.
168  *
169  * __GFP_NOTRACK avoids tracking with kmemcheck.
170  *
171  * __GFP_NOTRACK_FALSE_POSITIVE is an alias of __GFP_NOTRACK. It's a means of
172  *   distinguishing in the source between false positives and allocations that
173  *   cannot be supported (e.g. page tables).
174  *
175  * __GFP_OTHER_NODE is for allocations that are on a remote node but that
176  *   should not be accounted for as a remote allocation in vmstat. A
177  *   typical user would be khugepaged collapsing a huge page on a remote
178  *   node.
179  */
180 #define __GFP_COLD      ((__force gfp_t)___GFP_COLD)
181 #define __GFP_NOWARN    ((__force gfp_t)___GFP_NOWARN)
182 #define __GFP_COMP      ((__force gfp_t)___GFP_COMP)
183 #define __GFP_ZERO      ((__force gfp_t)___GFP_ZERO)
184 #define __GFP_NOTRACK   ((__force gfp_t)___GFP_NOTRACK)
185 #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)
186 #define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE)
187 
188 /* Room for N __GFP_FOO bits */
189 #define __GFP_BITS_SHIFT 26
190 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
191 
192 /*
193  * Useful GFP flag combinations that are commonly used. It is recommended
194  * that subsystems start with one of these combinations and then set/clear
195  * __GFP_FOO flags as necessary.
196  *
197  * GFP_ATOMIC users can not sleep and need the allocation to succeed. A lower
198  *   watermark is applied to allow access to "atomic reserves"
199  *
200  * GFP_KERNEL is typical for kernel-internal allocations. The caller requires
201  *   ZONE_NORMAL or a lower zone for direct access but can direct reclaim.
202  *
203  * GFP_KERNEL_ACCOUNT is the same as GFP_KERNEL, except the allocation is
204  *   accounted to kmemcg.
205  *
206  * GFP_NOWAIT is for kernel allocations that should not stall for direct
207  *   reclaim, start physical IO or use any filesystem callback.
208  *
209  * GFP_NOIO will use direct reclaim to discard clean pages or slab pages
210  *   that do not require the starting of any physical IO.
211  *
212  * GFP_NOFS will use direct reclaim but will not use any filesystem interfaces.
213  *
214  * GFP_USER is for userspace allocations that also need to be directly
215  *   accessibly by the kernel or hardware. It is typically used by hardware
216  *   for buffers that are mapped to userspace (e.g. graphics) that hardware
217  *   still must DMA to. cpuset limits are enforced for these allocations.
218  *
219  * GFP_DMA exists for historical reasons and should be avoided where possible.
220  *   The flags indicates that the caller requires that the lowest zone be
221  *   used (ZONE_DMA or 16M on x86-64). Ideally, this would be removed but
222  *   it would require careful auditing as some users really require it and
223  *   others use the flag to avoid lowmem reserves in ZONE_DMA and treat the
224  *   lowest zone as a type of emergency reserve.
225  *
226  * GFP_DMA32 is similar to GFP_DMA except that the caller requires a 32-bit
227  *   address.
228  *
229  * GFP_HIGHUSER is for userspace allocations that may be mapped to userspace,
230  *   do not need to be directly accessible by the kernel but that cannot
231  *   move once in use. An example may be a hardware allocation that maps
232  *   data directly into userspace but has no addressing limitations.
233  *
234  * GFP_HIGHUSER_MOVABLE is for userspace allocations that the kernel does not
235  *   need direct access to but can use kmap() when access is required. They
236  *   are expected to be movable via page reclaim or page migration. Typically,
237  *   pages on the LRU would also be allocated with GFP_HIGHUSER_MOVABLE.
238  *
239  * GFP_TRANSHUGE is used for THP allocations. They are compound allocations
240  *   that will fail quickly if memory is not available and will not wake
241  *   kswapd on failure.
242  */
243 #define GFP_ATOMIC      (__GFP_HIGH|__GFP_ATOMIC|__GFP_KSWAPD_RECLAIM)
244 #define GFP_KERNEL      (__GFP_RECLAIM | __GFP_IO | __GFP_FS)
245 #define GFP_KERNEL_ACCOUNT (GFP_KERNEL | __GFP_ACCOUNT)
246 #define GFP_NOWAIT      (__GFP_KSWAPD_RECLAIM)
247 #define GFP_NOIO        (__GFP_RECLAIM)
248 #define GFP_NOFS        (__GFP_RECLAIM | __GFP_IO)
249 #define GFP_TEMPORARY   (__GFP_RECLAIM | __GFP_IO | __GFP_FS | \
250                          __GFP_RECLAIMABLE)
251 #define GFP_USER        (__GFP_RECLAIM | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
252 #define GFP_DMA         __GFP_DMA
253 #define GFP_DMA32       __GFP_DMA32
254 #define GFP_HIGHUSER    (GFP_USER | __GFP_HIGHMEM)
255 #define GFP_HIGHUSER_MOVABLE    (GFP_HIGHUSER | __GFP_MOVABLE)
256 #define GFP_TRANSHUGE   ((GFP_HIGHUSER_MOVABLE | __GFP_COMP | \
257                          __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN) & \
258                          ~__GFP_KSWAPD_RECLAIM)
259 
260 /* Convert GFP flags to their corresponding migrate type */
261 #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)
262 #define GFP_MOVABLE_SHIFT 3
263 
264 static inline int gfpflags_to_migratetype(const gfp_t gfp_flags)
265 {
266         VM_WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
267         BUILD_BUG_ON((1UL << GFP_MOVABLE_SHIFT) != ___GFP_MOVABLE);
268         BUILD_BUG_ON((___GFP_MOVABLE >> GFP_MOVABLE_SHIFT) != MIGRATE_MOVABLE);
269 
270         if (unlikely(page_group_by_mobility_disabled))
271                 return MIGRATE_UNMOVABLE;
272 
273         /* Group based on mobility */
274         return (gfp_flags & GFP_MOVABLE_MASK) >> GFP_MOVABLE_SHIFT;
275 }
276 #undef GFP_MOVABLE_MASK
277 #undef GFP_MOVABLE_SHIFT
278 
279 static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags)
280 {
281         return !!(gfp_flags & __GFP_DIRECT_RECLAIM);
282 }
283 
284 #ifdef CONFIG_HIGHMEM
285 #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM
286 #else
287 #define OPT_ZONE_HIGHMEM ZONE_NORMAL
288 #endif
289 
290 #ifdef CONFIG_ZONE_DMA
291 #define OPT_ZONE_DMA ZONE_DMA
292 #else
293 #define OPT_ZONE_DMA ZONE_NORMAL
294 #endif
295 
296 #ifdef CONFIG_ZONE_DMA32
297 #define OPT_ZONE_DMA32 ZONE_DMA32
298 #else
299 #define OPT_ZONE_DMA32 ZONE_NORMAL
300 #endif
301 
302 /*
303  * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the
304  * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long
305  * and there are 16 of them to cover all possible combinations of
306  * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM.
307  *
308  * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA.
309  * But GFP_MOVABLE is not only a zone specifier but also an allocation
310  * policy. Therefore __GFP_MOVABLE plus another zone selector is valid.
311  * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1".
312  *
313  *       bit       result
314  *       =================
315  *       0x0    => NORMAL
316  *       0x1    => DMA or NORMAL
317  *       0x2    => HIGHMEM or NORMAL
318  *       0x3    => BAD (DMA+HIGHMEM)
319  *       0x4    => DMA32 or DMA or NORMAL
320  *       0x5    => BAD (DMA+DMA32)
321  *       0x6    => BAD (HIGHMEM+DMA32)
322  *       0x7    => BAD (HIGHMEM+DMA32+DMA)
323  *       0x8    => NORMAL (MOVABLE+0)
324  *       0x9    => DMA or NORMAL (MOVABLE+DMA)
325  *       0xa    => MOVABLE (Movable is valid only if HIGHMEM is set too)
326  *       0xb    => BAD (MOVABLE+HIGHMEM+DMA)
327  *       0xc    => DMA32 (MOVABLE+DMA32)
328  *       0xd    => BAD (MOVABLE+DMA32+DMA)
329  *       0xe    => BAD (MOVABLE+DMA32+HIGHMEM)
330  *       0xf    => BAD (MOVABLE+DMA32+HIGHMEM+DMA)
331  *
332  * ZONES_SHIFT must be <= 2 on 32 bit platforms.
333  */
334 
335 #if 16 * ZONES_SHIFT > BITS_PER_LONG
336 #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer
337 #endif
338 
339 #define GFP_ZONE_TABLE ( \
340         (ZONE_NORMAL << 0 * ZONES_SHIFT)                                      \
341         | (OPT_ZONE_DMA << ___GFP_DMA * ZONES_SHIFT)                          \
342         | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * ZONES_SHIFT)                  \
343         | (OPT_ZONE_DMA32 << ___GFP_DMA32 * ZONES_SHIFT)                      \
344         | (ZONE_NORMAL << ___GFP_MOVABLE * ZONES_SHIFT)                       \
345         | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * ZONES_SHIFT)       \
346         | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * ZONES_SHIFT)   \
347         | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * ZONES_SHIFT)   \
348 )
349 
350 /*
351  * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32
352  * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per
353  * entry starting with bit 0. Bit is set if the combination is not
354  * allowed.
355  */
356 #define GFP_ZONE_BAD ( \
357         1 << (___GFP_DMA | ___GFP_HIGHMEM)                                    \
358         | 1 << (___GFP_DMA | ___GFP_DMA32)                                    \
359         | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM)                                \
360         | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM)                   \
361         | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA)                 \
362         | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA)                   \
363         | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM)               \
364         | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM)  \
365 )
366 
367 static inline enum zone_type gfp_zone(gfp_t flags)
368 {
369         enum zone_type z;
370         int bit = (__force int) (flags & GFP_ZONEMASK);
371 
372         z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) &
373                                          ((1 << ZONES_SHIFT) - 1);
374         VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1);
375         return z;
376 }
377 
378 /*
379  * There is only one page-allocator function, and two main namespaces to
380  * it. The alloc_page*() variants return 'struct page *' and as such
381  * can allocate highmem pages, the *get*page*() variants return
382  * virtual kernel addresses to the allocated page(s).
383  */
384 
385 static inline int gfp_zonelist(gfp_t flags)
386 {
387 #ifdef CONFIG_NUMA
388         if (unlikely(flags & __GFP_THISNODE))
389                 return ZONELIST_NOFALLBACK;
390 #endif
391         return ZONELIST_FALLBACK;
392 }
393 
394 /*
395  * We get the zone list from the current node and the gfp_mask.
396  * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
397  * There are two zonelists per node, one for all zones with memory and
398  * one containing just zones from the node the zonelist belongs to.
399  *
400  * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
401  * optimized to &contig_page_data at compile-time.
402  */
403 static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
404 {
405         return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags);
406 }
407 
408 #ifndef HAVE_ARCH_FREE_PAGE
409 static inline void arch_free_page(struct page *page, int order) { }
410 #endif
411 #ifndef HAVE_ARCH_ALLOC_PAGE
412 static inline void arch_alloc_page(struct page *page, int order) { }
413 #endif
414 
415 struct page *
416 __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
417                        struct zonelist *zonelist, nodemask_t *nodemask);
418 
419 static inline struct page *
420 __alloc_pages(gfp_t gfp_mask, unsigned int order,
421                 struct zonelist *zonelist)
422 {
423         return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL);
424 }
425 
426 /*
427  * Allocate pages, preferring the node given as nid. The node must be valid and
428  * online. For more general interface, see alloc_pages_node().
429  */
430 static inline struct page *
431 __alloc_pages_node(int nid, gfp_t gfp_mask, unsigned int order)
432 {
433         VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES);
434         VM_WARN_ON(!node_online(nid));
435 
436         return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
437 }
438 
439 /*
440  * Allocate pages, preferring the node given as nid. When nid == NUMA_NO_NODE,
441  * prefer the current CPU's closest node. Otherwise node must be valid and
442  * online.
443  */
444 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
445                                                 unsigned int order)
446 {
447         if (nid == NUMA_NO_NODE)
448                 nid = numa_mem_id();
449 
450         return __alloc_pages_node(nid, gfp_mask, order);
451 }
452 
453 #ifdef CONFIG_NUMA
454 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
455 
456 static inline struct page *
457 alloc_pages(gfp_t gfp_mask, unsigned int order)
458 {
459         return alloc_pages_current(gfp_mask, order);
460 }
461 extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order,
462                         struct vm_area_struct *vma, unsigned long addr,
463                         int node, bool hugepage);
464 #define alloc_hugepage_vma(gfp_mask, vma, addr, order)  \
465         alloc_pages_vma(gfp_mask, order, vma, addr, numa_node_id(), true)
466 #else
467 #define alloc_pages(gfp_mask, order) \
468                 alloc_pages_node(numa_node_id(), gfp_mask, order)
469 #define alloc_pages_vma(gfp_mask, order, vma, addr, node, false)\
470         alloc_pages(gfp_mask, order)
471 #define alloc_hugepage_vma(gfp_mask, vma, addr, order)  \
472         alloc_pages(gfp_mask, order)
473 #endif
474 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
475 #define alloc_page_vma(gfp_mask, vma, addr)                     \
476         alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id(), false)
477 #define alloc_page_vma_node(gfp_mask, vma, addr, node)          \
478         alloc_pages_vma(gfp_mask, 0, vma, addr, node, false)
479 
480 extern struct page *alloc_kmem_pages(gfp_t gfp_mask, unsigned int order);
481 extern struct page *alloc_kmem_pages_node(int nid, gfp_t gfp_mask,
482                                           unsigned int order);
483 
484 extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
485 extern unsigned long get_zeroed_page(gfp_t gfp_mask);
486 
487 void *alloc_pages_exact(size_t size, gfp_t gfp_mask);
488 void free_pages_exact(void *virt, size_t size);
489 void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask);
490 
491 #define __get_free_page(gfp_mask) \
492                 __get_free_pages((gfp_mask), 0)
493 
494 #define __get_dma_pages(gfp_mask, order) \
495                 __get_free_pages((gfp_mask) | GFP_DMA, (order))
496 
497 extern void __free_pages(struct page *page, unsigned int order);
498 extern void free_pages(unsigned long addr, unsigned int order);
499 extern void free_hot_cold_page(struct page *page, bool cold);
500 extern void free_hot_cold_page_list(struct list_head *list, bool cold);
501 
502 struct page_frag_cache;
503 extern void *__alloc_page_frag(struct page_frag_cache *nc,
504                                unsigned int fragsz, gfp_t gfp_mask);
505 extern void __free_page_frag(void *addr);
506 
507 extern void __free_kmem_pages(struct page *page, unsigned int order);
508 extern void free_kmem_pages(unsigned long addr, unsigned int order);
509 
510 #define __free_page(page) __free_pages((page), 0)
511 #define free_page(addr) free_pages((addr), 0)
512 
513 void page_alloc_init(void);
514 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
515 void drain_all_pages(struct zone *zone);
516 void drain_local_pages(struct zone *zone);
517 
518 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
519 void page_alloc_init_late(void);
520 #else
521 static inline void page_alloc_init_late(void)
522 {
523 }
524 #endif
525 
526 /*
527  * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what
528  * GFP flags are used before interrupts are enabled. Once interrupts are
529  * enabled, it is set to __GFP_BITS_MASK while the system is running. During
530  * hibernation, it is used by PM to avoid I/O during memory allocation while
531  * devices are suspended.
532  */
533 extern gfp_t gfp_allowed_mask;
534 
535 /* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */
536 bool gfp_pfmemalloc_allowed(gfp_t gfp_mask);
537 
538 extern void pm_restrict_gfp_mask(void);
539 extern void pm_restore_gfp_mask(void);
540 
541 #ifdef CONFIG_PM_SLEEP
542 extern bool pm_suspended_storage(void);
543 #else
544 static inline bool pm_suspended_storage(void)
545 {
546         return false;
547 }
548 #endif /* CONFIG_PM_SLEEP */
549 
550 #if (defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || defined(CONFIG_CMA)
551 /* The below functions must be run on a range from a single zone. */
552 extern int alloc_contig_range(unsigned long start, unsigned long end,
553                               unsigned migratetype);
554 extern void free_contig_range(unsigned long pfn, unsigned nr_pages);
555 #endif
556 
557 #ifdef CONFIG_CMA
558 /* CMA stuff */
559 extern void init_cma_reserved_pageblock(struct page *page);
560 #endif
561 
562 #endif /* __LINUX_GFP_H */
563 

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