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 /* 13 * In case of changes, please don't forget to update 14 * include/trace/events/mmflags.h and tools/perf/builtin-kmem.c 15 */ 16 17 /* Plain integer GFP bitmasks. Do not use this directly. */ 18 #define ___GFP_DMA 0x01u 19 #define ___GFP_HIGHMEM 0x02u 20 #define ___GFP_DMA32 0x04u 21 #define ___GFP_MOVABLE 0x08u 22 #define ___GFP_RECLAIMABLE 0x10u 23 #define ___GFP_HIGH 0x20u 24 #define ___GFP_IO 0x40u 25 #define ___GFP_FS 0x80u 26 #define ___GFP_COLD 0x100u 27 #define ___GFP_NOWARN 0x200u 28 #define ___GFP_REPEAT 0x400u 29 #define ___GFP_NOFAIL 0x800u 30 #define ___GFP_NORETRY 0x1000u 31 #define ___GFP_MEMALLOC 0x2000u 32 #define ___GFP_COMP 0x4000u 33 #define ___GFP_ZERO 0x8000u 34 #define ___GFP_NOMEMALLOC 0x10000u 35 #define ___GFP_HARDWALL 0x20000u 36 #define ___GFP_THISNODE 0x40000u 37 #define ___GFP_ATOMIC 0x80000u 38 #define ___GFP_ACCOUNT 0x100000u 39 #define ___GFP_NOTRACK 0x200000u 40 #define ___GFP_DIRECT_RECLAIM 0x400000u 41 #define ___GFP_OTHER_NODE 0x800000u 42 #define ___GFP_WRITE 0x1000000u 43 #define ___GFP_KSWAPD_RECLAIM 0x2000000u 44 /* If the above are modified, __GFP_BITS_SHIFT may need updating */ 45 46 /* 47 * Physical address zone modifiers (see linux/mmzone.h - low four bits) 48 * 49 * Do not put any conditional on these. If necessary modify the definitions 50 * without the underscores and use them consistently. The definitions here may 51 * be used in bit comparisons. 52 */ 53 #define __GFP_DMA ((__force gfp_t)___GFP_DMA) 54 #define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM) 55 #define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32) 56 #define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* ZONE_MOVABLE allowed */ 57 #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) 58 59 /* 60 * Page mobility and placement hints 61 * 62 * These flags provide hints about how mobile the page is. Pages with similar 63 * mobility are placed within the same pageblocks to minimise problems due 64 * to external fragmentation. 65 * 66 * __GFP_MOVABLE (also a zone modifier) indicates that the page can be 67 * moved by page migration during memory compaction or can be reclaimed. 68 * 69 * __GFP_RECLAIMABLE is used for slab allocations that specify 70 * SLAB_RECLAIM_ACCOUNT and whose pages can be freed via shrinkers. 71 * 72 * __GFP_WRITE indicates the caller intends to dirty the page. Where possible, 73 * these pages will be spread between local zones to avoid all the dirty 74 * pages being in one zone (fair zone allocation policy). 75 * 76 * __GFP_HARDWALL enforces the cpuset memory allocation policy. 77 * 78 * __GFP_THISNODE forces the allocation to be satisified from the requested 79 * node with no fallbacks or placement policy enforcements. 80 * 81 * __GFP_ACCOUNT causes the allocation to be accounted to kmemcg (only relevant 82 * to kmem allocations). 83 */ 84 #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) 85 #define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) 86 #define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) 87 #define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE) 88 #define __GFP_ACCOUNT ((__force gfp_t)___GFP_ACCOUNT) 89 90 /* 91 * Watermark modifiers -- controls access to emergency reserves 92 * 93 * __GFP_HIGH indicates that the caller is high-priority and that granting 94 * the request is necessary before the system can make forward progress. 95 * For example, creating an IO context to clean pages. 96 * 97 * __GFP_ATOMIC indicates that the caller cannot reclaim or sleep and is 98 * high priority. Users are typically interrupt handlers. This may be 99 * used in conjunction with __GFP_HIGH 100 * 101 * __GFP_MEMALLOC allows access to all memory. This should only be used when 102 * the caller guarantees the allocation will allow more memory to be freed 103 * very shortly e.g. process exiting or swapping. Users either should 104 * be the MM or co-ordinating closely with the VM (e.g. swap over NFS). 105 * 106 * __GFP_NOMEMALLOC is used to explicitly forbid access to emergency reserves. 107 * This takes precedence over the __GFP_MEMALLOC flag if both are set. 108 */ 109 #define __GFP_ATOMIC ((__force gfp_t)___GFP_ATOMIC) 110 #define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) 111 #define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC) 112 #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) 113 114 /* 115 * Reclaim modifiers 116 * 117 * __GFP_IO can start physical IO. 118 * 119 * __GFP_FS can call down to the low-level FS. Clearing the flag avoids the 120 * allocator recursing into the filesystem which might already be holding 121 * locks. 122 * 123 * __GFP_DIRECT_RECLAIM indicates that the caller may enter direct reclaim. 124 * This flag can be cleared to avoid unnecessary delays when a fallback 125 * option is available. 126 * 127 * __GFP_KSWAPD_RECLAIM indicates that the caller wants to wake kswapd when 128 * the low watermark is reached and have it reclaim pages until the high 129 * watermark is reached. A caller may wish to clear this flag when fallback 130 * options are available and the reclaim is likely to disrupt the system. The 131 * canonical example is THP allocation where a fallback is cheap but 132 * reclaim/compaction may cause indirect stalls. 133 * 134 * __GFP_RECLAIM is shorthand to allow/forbid both direct and kswapd reclaim. 135 * 136 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt 137 * _might_ fail. This depends upon the particular VM implementation. 138 * 139 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller 140 * cannot handle allocation failures. New users should be evaluated carefully 141 * (and the flag should be used only when there is no reasonable failure 142 * policy) but it is definitely preferable to use the flag rather than 143 * opencode endless loop around allocator. 144 * 145 * __GFP_NORETRY: The VM implementation must not retry indefinitely and will 146 * return NULL when direct reclaim and memory compaction have failed to allow 147 * the allocation to succeed. The OOM killer is not called with the current 148 * implementation. 149 */ 150 #define __GFP_IO ((__force gfp_t)___GFP_IO) 151 #define __GFP_FS ((__force gfp_t)___GFP_FS) 152 #define __GFP_DIRECT_RECLAIM ((__force gfp_t)___GFP_DIRECT_RECLAIM) /* Caller can reclaim */ 153 #define __GFP_KSWAPD_RECLAIM ((__force gfp_t)___GFP_KSWAPD_RECLAIM) /* kswapd can wake */ 154 #define __GFP_RECLAIM ((__force gfp_t)(___GFP_DIRECT_RECLAIM|___GFP_KSWAPD_RECLAIM)) 155 #define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) 156 #define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) 157 #define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) 158 159 /* 160 * Action modifiers 161 * 162 * __GFP_COLD indicates that the caller does not expect to be used in the near 163 * future. Where possible, a cache-cold page will be returned. 164 * 165 * __GFP_NOWARN suppresses allocation failure reports. 166 * 167 * __GFP_COMP address compound page metadata. 168 * 169 * __GFP_ZERO returns a zeroed page on success. 170 * 171 * __GFP_NOTRACK avoids tracking with kmemcheck. 172 * 173 * __GFP_NOTRACK_FALSE_POSITIVE is an alias of __GFP_NOTRACK. It's a means of 174 * distinguishing in the source between false positives and allocations that 175 * cannot be supported (e.g. page tables). 176 * 177 * __GFP_OTHER_NODE is for allocations that are on a remote node but that 178 * should not be accounted for as a remote allocation in vmstat. A 179 * typical user would be khugepaged collapsing a huge page on a remote 180 * node. 181 */ 182 #define __GFP_COLD ((__force gfp_t)___GFP_COLD) 183 #define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) 184 #define __GFP_COMP ((__force gfp_t)___GFP_COMP) 185 #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) 186 #define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) 187 #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK) 188 #define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) 189 190 /* Room for N __GFP_FOO bits */ 191 #define __GFP_BITS_SHIFT 26 192 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) 193 194 /* 195 * Useful GFP flag combinations that are commonly used. It is recommended 196 * that subsystems start with one of these combinations and then set/clear 197 * __GFP_FOO flags as necessary. 198 * 199 * GFP_ATOMIC users can not sleep and need the allocation to succeed. A lower 200 * watermark is applied to allow access to "atomic reserves" 201 * 202 * GFP_KERNEL is typical for kernel-internal allocations. The caller requires 203 * ZONE_NORMAL or a lower zone for direct access but can direct reclaim. 204 * 205 * GFP_KERNEL_ACCOUNT is the same as GFP_KERNEL, except the allocation is 206 * accounted to kmemcg. 207 * 208 * GFP_NOWAIT is for kernel allocations that should not stall for direct 209 * reclaim, start physical IO or use any filesystem callback. 210 * 211 * GFP_NOIO will use direct reclaim to discard clean pages or slab pages 212 * that do not require the starting of any physical IO. 213 * 214 * GFP_NOFS will use direct reclaim but will not use any filesystem interfaces. 215 * 216 * GFP_USER is for userspace allocations that also need to be directly 217 * accessibly by the kernel or hardware. It is typically used by hardware 218 * for buffers that are mapped to userspace (e.g. graphics) that hardware 219 * still must DMA to. cpuset limits are enforced for these allocations. 220 * 221 * GFP_DMA exists for historical reasons and should be avoided where possible. 222 * The flags indicates that the caller requires that the lowest zone be 223 * used (ZONE_DMA or 16M on x86-64). Ideally, this would be removed but 224 * it would require careful auditing as some users really require it and 225 * others use the flag to avoid lowmem reserves in ZONE_DMA and treat the 226 * lowest zone as a type of emergency reserve. 227 * 228 * GFP_DMA32 is similar to GFP_DMA except that the caller requires a 32-bit 229 * address. 230 * 231 * GFP_HIGHUSER is for userspace allocations that may be mapped to userspace, 232 * do not need to be directly accessible by the kernel but that cannot 233 * move once in use. An example may be a hardware allocation that maps 234 * data directly into userspace but has no addressing limitations. 235 * 236 * GFP_HIGHUSER_MOVABLE is for userspace allocations that the kernel does not 237 * need direct access to but can use kmap() when access is required. They 238 * are expected to be movable via page reclaim or page migration. Typically, 239 * pages on the LRU would also be allocated with GFP_HIGHUSER_MOVABLE. 240 * 241 * GFP_TRANSHUGE is used for THP allocations. They are compound allocations 242 * that will fail quickly if memory is not available and will not wake 243 * kswapd on failure. 244 */ 245 #define GFP_ATOMIC (__GFP_HIGH|__GFP_ATOMIC|__GFP_KSWAPD_RECLAIM) 246 #define GFP_KERNEL (__GFP_RECLAIM | __GFP_IO | __GFP_FS) 247 #define GFP_KERNEL_ACCOUNT (GFP_KERNEL | __GFP_ACCOUNT) 248 #define GFP_NOWAIT (__GFP_KSWAPD_RECLAIM) 249 #define GFP_NOIO (__GFP_RECLAIM) 250 #define GFP_NOFS (__GFP_RECLAIM | __GFP_IO) 251 #define GFP_TEMPORARY (__GFP_RECLAIM | __GFP_IO | __GFP_FS | \ 252 __GFP_RECLAIMABLE) 253 #define GFP_USER (__GFP_RECLAIM | __GFP_IO | __GFP_FS | __GFP_HARDWALL) 254 #define GFP_DMA __GFP_DMA 255 #define GFP_DMA32 __GFP_DMA32 256 #define GFP_HIGHUSER (GFP_USER | __GFP_HIGHMEM) 257 #define GFP_HIGHUSER_MOVABLE (GFP_HIGHUSER | __GFP_MOVABLE) 258 #define GFP_TRANSHUGE ((GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ 259 __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN) & \ 260 ~__GFP_RECLAIM) 261 262 /* Convert GFP flags to their corresponding migrate type */ 263 #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) 264 #define GFP_MOVABLE_SHIFT 3 265 266 static inline int gfpflags_to_migratetype(const gfp_t gfp_flags) 267 { 268 VM_WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); 269 BUILD_BUG_ON((1UL << GFP_MOVABLE_SHIFT) != ___GFP_MOVABLE); 270 BUILD_BUG_ON((___GFP_MOVABLE >> GFP_MOVABLE_SHIFT) != MIGRATE_MOVABLE); 271 272 if (unlikely(page_group_by_mobility_disabled)) 273 return MIGRATE_UNMOVABLE; 274 275 /* Group based on mobility */ 276 return (gfp_flags & GFP_MOVABLE_MASK) >> GFP_MOVABLE_SHIFT; 277 } 278 #undef GFP_MOVABLE_MASK 279 #undef GFP_MOVABLE_SHIFT 280 281 static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags) 282 { 283 return !!(gfp_flags & __GFP_DIRECT_RECLAIM); 284 } 285 286 #ifdef CONFIG_HIGHMEM 287 #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM 288 #else 289 #define OPT_ZONE_HIGHMEM ZONE_NORMAL 290 #endif 291 292 #ifdef CONFIG_ZONE_DMA 293 #define OPT_ZONE_DMA ZONE_DMA 294 #else 295 #define OPT_ZONE_DMA ZONE_NORMAL 296 #endif 297 298 #ifdef CONFIG_ZONE_DMA32 299 #define OPT_ZONE_DMA32 ZONE_DMA32 300 #else 301 #define OPT_ZONE_DMA32 ZONE_NORMAL 302 #endif 303 304 /* 305 * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the 306 * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long 307 * and there are 16 of them to cover all possible combinations of 308 * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM. 309 * 310 * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. 311 * But GFP_MOVABLE is not only a zone specifier but also an allocation 312 * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. 313 * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1". 314 * 315 * bit result 316 * ================= 317 * 0x0 => NORMAL 318 * 0x1 => DMA or NORMAL 319 * 0x2 => HIGHMEM or NORMAL 320 * 0x3 => BAD (DMA+HIGHMEM) 321 * 0x4 => DMA32 or DMA or NORMAL 322 * 0x5 => BAD (DMA+DMA32) 323 * 0x6 => BAD (HIGHMEM+DMA32) 324 * 0x7 => BAD (HIGHMEM+DMA32+DMA) 325 * 0x8 => NORMAL (MOVABLE+0) 326 * 0x9 => DMA or NORMAL (MOVABLE+DMA) 327 * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) 328 * 0xb => BAD (MOVABLE+HIGHMEM+DMA) 329 * 0xc => DMA32 (MOVABLE+DMA32) 330 * 0xd => BAD (MOVABLE+DMA32+DMA) 331 * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) 332 * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) 333 * 334 * ZONES_SHIFT must be <= 2 on 32 bit platforms. 335 */ 336 337 #if 16 * ZONES_SHIFT > BITS_PER_LONG 338 #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer 339 #endif 340 341 #define GFP_ZONE_TABLE ( \ 342 (ZONE_NORMAL << 0 * ZONES_SHIFT) \ 343 | (OPT_ZONE_DMA << ___GFP_DMA * ZONES_SHIFT) \ 344 | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * ZONES_SHIFT) \ 345 | (OPT_ZONE_DMA32 << ___GFP_DMA32 * ZONES_SHIFT) \ 346 | (ZONE_NORMAL << ___GFP_MOVABLE * ZONES_SHIFT) \ 347 | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * ZONES_SHIFT) \ 348 | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * ZONES_SHIFT) \ 349 | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * ZONES_SHIFT) \ 350 ) 351 352 /* 353 * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32 354 * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per 355 * entry starting with bit 0. Bit is set if the combination is not 356 * allowed. 357 */ 358 #define GFP_ZONE_BAD ( \ 359 1 << (___GFP_DMA | ___GFP_HIGHMEM) \ 360 | 1 << (___GFP_DMA | ___GFP_DMA32) \ 361 | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \ 362 | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \ 363 | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \ 364 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \ 365 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \ 366 | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \ 367 ) 368 369 static inline enum zone_type gfp_zone(gfp_t flags) 370 { 371 enum zone_type z; 372 int bit = (__force int) (flags & GFP_ZONEMASK); 373 374 z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) & 375 ((1 << ZONES_SHIFT) - 1); 376 VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1); 377 return z; 378 } 379 380 /* 381 * There is only one page-allocator function, and two main namespaces to 382 * it. The alloc_page*() variants return 'struct page *' and as such 383 * can allocate highmem pages, the *get*page*() variants return 384 * virtual kernel addresses to the allocated page(s). 385 */ 386 387 static inline int gfp_zonelist(gfp_t flags) 388 { 389 #ifdef CONFIG_NUMA 390 if (unlikely(flags & __GFP_THISNODE)) 391 return ZONELIST_NOFALLBACK; 392 #endif 393 return ZONELIST_FALLBACK; 394 } 395 396 /* 397 * We get the zone list from the current node and the gfp_mask. 398 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. 399 * There are two zonelists per node, one for all zones with memory and 400 * one containing just zones from the node the zonelist belongs to. 401 * 402 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets 403 * optimized to &contig_page_data at compile-time. 404 */ 405 static inline struct zonelist *node_zonelist(int nid, gfp_t flags) 406 { 407 return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); 408 } 409 410 #ifndef HAVE_ARCH_FREE_PAGE 411 static inline void arch_free_page(struct page *page, int order) { } 412 #endif 413 #ifndef HAVE_ARCH_ALLOC_PAGE 414 static inline void arch_alloc_page(struct page *page, int order) { } 415 #endif 416 417 struct page * 418 __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, 419 struct zonelist *zonelist, nodemask_t *nodemask); 420 421 static inline struct page * 422 __alloc_pages(gfp_t gfp_mask, unsigned int order, 423 struct zonelist *zonelist) 424 { 425 return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL); 426 } 427 428 /* 429 * Allocate pages, preferring the node given as nid. The node must be valid and 430 * online. For more general interface, see alloc_pages_node(). 431 */ 432 static inline struct page * 433 __alloc_pages_node(int nid, gfp_t gfp_mask, unsigned int order) 434 { 435 VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES); 436 VM_WARN_ON(!node_online(nid)); 437 438 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); 439 } 440 441 /* 442 * Allocate pages, preferring the node given as nid. When nid == NUMA_NO_NODE, 443 * prefer the current CPU's closest node. Otherwise node must be valid and 444 * online. 445 */ 446 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, 447 unsigned int order) 448 { 449 if (nid == NUMA_NO_NODE) 450 nid = numa_mem_id(); 451 452 return __alloc_pages_node(nid, gfp_mask, order); 453 } 454 455 #ifdef CONFIG_NUMA 456 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); 457 458 static inline struct page * 459 alloc_pages(gfp_t gfp_mask, unsigned int order) 460 { 461 return alloc_pages_current(gfp_mask, order); 462 } 463 extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, 464 struct vm_area_struct *vma, unsigned long addr, 465 int node, bool hugepage); 466 #define alloc_hugepage_vma(gfp_mask, vma, addr, order) \ 467 alloc_pages_vma(gfp_mask, order, vma, addr, numa_node_id(), true) 468 #else 469 #define alloc_pages(gfp_mask, order) \ 470 alloc_pages_node(numa_node_id(), gfp_mask, order) 471 #define alloc_pages_vma(gfp_mask, order, vma, addr, node, false)\ 472 alloc_pages(gfp_mask, order) 473 #define alloc_hugepage_vma(gfp_mask, vma, addr, order) \ 474 alloc_pages(gfp_mask, order) 475 #endif 476 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) 477 #define alloc_page_vma(gfp_mask, vma, addr) \ 478 alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id(), false) 479 #define alloc_page_vma_node(gfp_mask, vma, addr, node) \ 480 alloc_pages_vma(gfp_mask, 0, vma, addr, node, false) 481 482 extern struct page *alloc_kmem_pages(gfp_t gfp_mask, unsigned int order); 483 extern struct page *alloc_kmem_pages_node(int nid, gfp_t gfp_mask, 484 unsigned int order); 485 486 extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); 487 extern unsigned long get_zeroed_page(gfp_t gfp_mask); 488 489 void *alloc_pages_exact(size_t size, gfp_t gfp_mask); 490 void free_pages_exact(void *virt, size_t size); 491 void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); 492 493 #define __get_free_page(gfp_mask) \ 494 __get_free_pages((gfp_mask), 0) 495 496 #define __get_dma_pages(gfp_mask, order) \ 497 __get_free_pages((gfp_mask) | GFP_DMA, (order)) 498 499 extern void __free_pages(struct page *page, unsigned int order); 500 extern void free_pages(unsigned long addr, unsigned int order); 501 extern void free_hot_cold_page(struct page *page, bool cold); 502 extern void free_hot_cold_page_list(struct list_head *list, bool cold); 503 504 struct page_frag_cache; 505 extern void *__alloc_page_frag(struct page_frag_cache *nc, 506 unsigned int fragsz, gfp_t gfp_mask); 507 extern void __free_page_frag(void *addr); 508 509 extern void __free_kmem_pages(struct page *page, unsigned int order); 510 extern void free_kmem_pages(unsigned long addr, unsigned int order); 511 512 #define __free_page(page) __free_pages((page), 0) 513 #define free_page(addr) free_pages((addr), 0) 514 515 void page_alloc_init(void); 516 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); 517 void drain_all_pages(struct zone *zone); 518 void drain_local_pages(struct zone *zone); 519 520 void page_alloc_init_late(void); 521 522 /* 523 * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what 524 * GFP flags are used before interrupts are enabled. Once interrupts are 525 * enabled, it is set to __GFP_BITS_MASK while the system is running. During 526 * hibernation, it is used by PM to avoid I/O during memory allocation while 527 * devices are suspended. 528 */ 529 extern gfp_t gfp_allowed_mask; 530 531 /* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */ 532 bool gfp_pfmemalloc_allowed(gfp_t gfp_mask); 533 534 extern void pm_restrict_gfp_mask(void); 535 extern void pm_restore_gfp_mask(void); 536 537 #ifdef CONFIG_PM_SLEEP 538 extern bool pm_suspended_storage(void); 539 #else 540 static inline bool pm_suspended_storage(void) 541 { 542 return false; 543 } 544 #endif /* CONFIG_PM_SLEEP */ 545 546 #if (defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || defined(CONFIG_CMA) 547 /* The below functions must be run on a range from a single zone. */ 548 extern int alloc_contig_range(unsigned long start, unsigned long end, 549 unsigned migratetype); 550 extern void free_contig_range(unsigned long pfn, unsigned nr_pages); 551 #endif 552 553 #ifdef CONFIG_CMA 554 /* CMA stuff */ 555 extern void init_cma_reserved_pageblock(struct page *page); 556 #endif 557 558 #endif /* __LINUX_GFP_H */ 559