4 #include <linux/mmzone.h>
5 #include <linux/stddef.h>
6 #include <linux/linkage.h>
7 #include <linux/topology.h>
8 #include <linux/mmdebug.h>
10 struct vm_area_struct;
15 * Zone modifiers (see linux/mmzone.h - low three bits)
17 * Do not put any conditional on these. If necessary modify the definitions
18 * without the underscores and use the consistently. The definitions here may
19 * be used in bit comparisons.
21 #define __GFP_DMA ((__force gfp_t)0x01u)
22 #define __GFP_HIGHMEM ((__force gfp_t)0x02u)
23 #define __GFP_DMA32 ((__force gfp_t)0x04u)
24 #define __GFP_MOVABLE ((__force gfp_t)0x08u) /* Page is movable */
25 #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE)
27 * Action modifiers - doesn't change the zoning
29 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
30 * _might_ fail. This depends upon the particular VM implementation.
32 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
33 * cannot handle allocation failures.
35 * __GFP_NORETRY: The VM implementation must not retry indefinitely.
37 * __GFP_MOVABLE: Flag that this page will be movable by the page migration
38 * mechanism or reclaimed
40 #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */
41 #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */
42 #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */
43 #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */
44 #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */
45 #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */
46 #define __GFP_REPEAT ((__force gfp_t)0x400u) /* See above */
47 #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */
48 #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */
49 #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */
50 #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */
51 #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
52 #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
53 #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */
54 #define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */
56 #ifdef CONFIG_KMEMCHECK
57 #define __GFP_NOTRACK ((__force gfp_t)0x200000u) /* Don't track with kmemcheck */
59 #define __GFP_NOTRACK ((__force gfp_t)0)
63 * This may seem redundant, but it's a way of annotating false positives vs.
64 * allocations that simply cannot be supported (e.g. page tables).
66 #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)
68 #define __GFP_BITS_SHIFT 22 /* Room for 22 __GFP_FOO bits */
69 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
71 /* This equals 0, but use constants in case they ever change */
72 #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
73 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
74 #define GFP_ATOMIC (__GFP_HIGH)
75 #define GFP_NOIO (__GFP_WAIT)
76 #define GFP_NOFS (__GFP_WAIT | __GFP_IO)
77 #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
78 #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \
80 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
81 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
83 #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
84 __GFP_HARDWALL | __GFP_HIGHMEM | \
88 #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
90 #define GFP_THISNODE ((__force gfp_t)0)
93 /* This mask makes up all the page movable related flags */
94 #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)
96 /* Control page allocator reclaim behavior */
97 #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\
98 __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
99 __GFP_NORETRY|__GFP_NOMEMALLOC)
101 /* Control slab gfp mask during early boot */
102 #define SLAB_GFP_BOOT_MASK __GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)
104 /* Control allocation constraints */
105 #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
107 /* Do not use these with a slab allocator */
108 #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
110 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
111 platforms, used as appropriate on others */
113 #define GFP_DMA __GFP_DMA
115 /* 4GB DMA on some platforms */
116 #define GFP_DMA32 __GFP_DMA32
118 /* Convert GFP flags to their corresponding migrate type */
119 static inline int allocflags_to_migratetype(gfp_t gfp_flags)
121 WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
123 if (unlikely(page_group_by_mobility_disabled))
124 return MIGRATE_UNMOVABLE;
126 /* Group based on mobility */
127 return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) |
128 ((gfp_flags & __GFP_RECLAIMABLE) != 0);
131 #ifdef CONFIG_HIGHMEM
132 #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM
134 #define OPT_ZONE_HIGHMEM ZONE_NORMAL
137 #ifdef CONFIG_ZONE_DMA
138 #define OPT_ZONE_DMA ZONE_DMA
140 #define OPT_ZONE_DMA ZONE_NORMAL
143 #ifdef CONFIG_ZONE_DMA32
144 #define OPT_ZONE_DMA32 ZONE_DMA32
146 #define OPT_ZONE_DMA32 ZONE_NORMAL
150 * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the
151 * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long
152 * and there are 16 of them to cover all possible combinations of
153 * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM
155 * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA.
156 * But GFP_MOVABLE is not only a zone specifier but also an allocation
157 * policy. Therefore __GFP_MOVABLE plus another zone selector is valid.
158 * Only 1bit of the lowest 3 bit (DMA,DMA32,HIGHMEM) can be set to "1".
163 * 0x1 => DMA or NORMAL
164 * 0x2 => HIGHMEM or NORMAL
165 * 0x3 => BAD (DMA+HIGHMEM)
166 * 0x4 => DMA32 or DMA or NORMAL
167 * 0x5 => BAD (DMA+DMA32)
168 * 0x6 => BAD (HIGHMEM+DMA32)
169 * 0x7 => BAD (HIGHMEM+DMA32+DMA)
170 * 0x8 => NORMAL (MOVABLE+0)
171 * 0x9 => DMA or NORMAL (MOVABLE+DMA)
172 * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too)
173 * 0xb => BAD (MOVABLE+HIGHMEM+DMA)
174 * 0xc => DMA32 (MOVABLE+HIGHMEM+DMA32)
175 * 0xd => BAD (MOVABLE+DMA32+DMA)
176 * 0xe => BAD (MOVABLE+DMA32+HIGHMEM)
177 * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA)
179 * ZONES_SHIFT must be <= 2 on 32 bit platforms.
182 #if 16 * ZONES_SHIFT > BITS_PER_LONG
183 #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer
186 #define GFP_ZONE_TABLE ( \
187 (ZONE_NORMAL << 0 * ZONES_SHIFT) \
188 | (OPT_ZONE_DMA << __GFP_DMA * ZONES_SHIFT) \
189 | (OPT_ZONE_HIGHMEM << __GFP_HIGHMEM * ZONES_SHIFT) \
190 | (OPT_ZONE_DMA32 << __GFP_DMA32 * ZONES_SHIFT) \
191 | (ZONE_NORMAL << __GFP_MOVABLE * ZONES_SHIFT) \
192 | (OPT_ZONE_DMA << (__GFP_MOVABLE | __GFP_DMA) * ZONES_SHIFT) \
193 | (ZONE_MOVABLE << (__GFP_MOVABLE | __GFP_HIGHMEM) * ZONES_SHIFT)\
194 | (OPT_ZONE_DMA32 << (__GFP_MOVABLE | __GFP_DMA32) * ZONES_SHIFT)\
198 * GFP_ZONE_BAD is a bitmap for all combination of __GFP_DMA, __GFP_DMA32
199 * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per
200 * entry starting with bit 0. Bit is set if the combination is not
203 #define GFP_ZONE_BAD ( \
204 1 << (__GFP_DMA | __GFP_HIGHMEM) \
205 | 1 << (__GFP_DMA | __GFP_DMA32) \
206 | 1 << (__GFP_DMA32 | __GFP_HIGHMEM) \
207 | 1 << (__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM) \
208 | 1 << (__GFP_MOVABLE | __GFP_HIGHMEM | __GFP_DMA) \
209 | 1 << (__GFP_MOVABLE | __GFP_DMA32 | __GFP_DMA) \
210 | 1 << (__GFP_MOVABLE | __GFP_DMA32 | __GFP_HIGHMEM) \
211 | 1 << (__GFP_MOVABLE | __GFP_DMA32 | __GFP_DMA | __GFP_HIGHMEM)\
214 static inline enum zone_type gfp_zone(gfp_t flags)
217 int bit = flags & GFP_ZONEMASK;
219 z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) &
220 ((1 << ZONES_SHIFT) - 1);
222 if (__builtin_constant_p(bit))
223 BUILD_BUG_ON((GFP_ZONE_BAD >> bit) & 1);
225 #ifdef CONFIG_DEBUG_VM
226 BUG_ON((GFP_ZONE_BAD >> bit) & 1);
233 * There is only one page-allocator function, and two main namespaces to
234 * it. The alloc_page*() variants return 'struct page *' and as such
235 * can allocate highmem pages, the *get*page*() variants return
236 * virtual kernel addresses to the allocated page(s).
239 static inline int gfp_zonelist(gfp_t flags)
241 if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE))
248 * We get the zone list from the current node and the gfp_mask.
249 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
250 * There are two zonelists per node, one for all zones with memory and
251 * one containing just zones from the node the zonelist belongs to.
253 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
254 * optimized to &contig_page_data at compile-time.
256 static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
258 return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags);
261 #ifndef HAVE_ARCH_FREE_PAGE
262 static inline void arch_free_page(struct page *page, int order) { }
264 #ifndef HAVE_ARCH_ALLOC_PAGE
265 static inline void arch_alloc_page(struct page *page, int order) { }
269 __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
270 struct zonelist *zonelist, nodemask_t *nodemask);
272 static inline struct page *
273 __alloc_pages(gfp_t gfp_mask, unsigned int order,
274 struct zonelist *zonelist)
276 return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL);
279 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
282 /* Unknown node is current node */
284 nid = numa_node_id();
286 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
289 static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask,
292 VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES);
294 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
298 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
300 static inline struct page *
301 alloc_pages(gfp_t gfp_mask, unsigned int order)
303 return alloc_pages_current(gfp_mask, order);
305 extern struct page *alloc_page_vma(gfp_t gfp_mask,
306 struct vm_area_struct *vma, unsigned long addr);
308 #define alloc_pages(gfp_mask, order) \
309 alloc_pages_node(numa_node_id(), gfp_mask, order)
310 #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
312 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
314 extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
315 extern unsigned long get_zeroed_page(gfp_t gfp_mask);
317 void *alloc_pages_exact(size_t size, gfp_t gfp_mask);
318 void free_pages_exact(void *virt, size_t size);
320 #define __get_free_page(gfp_mask) \
321 __get_free_pages((gfp_mask),0)
323 #define __get_dma_pages(gfp_mask, order) \
324 __get_free_pages((gfp_mask) | GFP_DMA,(order))
326 extern void __free_pages(struct page *page, unsigned int order);
327 extern void free_pages(unsigned long addr, unsigned int order);
328 extern void free_hot_page(struct page *page);
329 extern void free_cold_page(struct page *page);
331 #define __free_page(page) __free_pages((page), 0)
332 #define free_page(addr) free_pages((addr),0)
334 void page_alloc_init(void);
335 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
336 void drain_all_pages(void);
337 void drain_local_pages(void *dummy);
339 extern bool oom_killer_disabled;
341 static inline void oom_killer_disable(void)
343 oom_killer_disabled = true;
346 static inline void oom_killer_enable(void)
348 oom_killer_disabled = false;
351 #endif /* __LINUX_GFP_H */