4 #include <linux/mmzone.h>
5 #include <linux/stddef.h>
6 #include <linux/linkage.h>
13 * Zone modifiers (see linux/mmzone.h - low three bits)
15 * Do not put any conditional on these. If necessary modify the definitions
16 * without the underscores and use the consistently. The definitions here may
17 * be used in bit comparisons.
19 #define __GFP_DMA ((__force gfp_t)0x01u)
20 #define __GFP_HIGHMEM ((__force gfp_t)0x02u)
21 #define __GFP_DMA32 ((__force gfp_t)0x04u)
24 * Action modifiers - doesn't change the zoning
26 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
27 * _might_ fail. This depends upon the particular VM implementation.
29 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
30 * cannot handle allocation failures.
32 * __GFP_NORETRY: The VM implementation must not retry indefinitely.
34 * __GFP_MOVABLE: Flag that this page will be movable by the page migration
35 * mechanism or reclaimed
37 #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */
38 #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */
39 #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */
40 #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */
41 #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */
42 #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */
43 #define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */
44 #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */
45 #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */
46 #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */
47 #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */
48 #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
49 #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
50 #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */
51 #define __GFP_MOVABLE ((__force gfp_t)0x80000u) /* Page is movable */
53 #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */
54 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
56 /* This equals 0, but use constants in case they ever change */
57 #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
58 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
59 #define GFP_ATOMIC (__GFP_HIGH)
60 #define GFP_NOIO (__GFP_WAIT)
61 #define GFP_NOFS (__GFP_WAIT | __GFP_IO)
62 #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
63 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
64 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
66 #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
67 __GFP_HARDWALL | __GFP_HIGHMEM | \
69 #define GFP_NOFS_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_MOVABLE)
70 #define GFP_USER_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
71 __GFP_HARDWALL | __GFP_MOVABLE)
72 #define GFP_HIGHUSER_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
73 __GFP_HARDWALL | __GFP_HIGHMEM | \
77 #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
79 #define GFP_THISNODE ((__force gfp_t)0)
82 /* This mask makes up all the page movable related flags */
83 #define GFP_MOVABLE_MASK (__GFP_MOVABLE)
85 /* Control page allocator reclaim behavior */
86 #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\
87 __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
88 __GFP_NORETRY|__GFP_NOMEMALLOC)
90 /* Control allocation constraints */
91 #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
93 /* Do not use these with a slab allocator */
94 #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
96 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
97 platforms, used as appropriate on others */
99 #define GFP_DMA __GFP_DMA
101 /* 4GB DMA on some platforms */
102 #define GFP_DMA32 __GFP_DMA32
105 static inline enum zone_type
gfp_zone(gfp_t flags
)
107 #ifdef CONFIG_ZONE_DMA
108 if (flags
& __GFP_DMA
)
111 #ifdef CONFIG_ZONE_DMA32
112 if (flags
& __GFP_DMA32
)
115 #ifdef CONFIG_HIGHMEM
116 if (flags
& __GFP_HIGHMEM
)
123 * There is only one page-allocator function, and two main namespaces to
124 * it. The alloc_page*() variants return 'struct page *' and as such
125 * can allocate highmem pages, the *get*page*() variants return
126 * virtual kernel addresses to the allocated page(s).
130 * We get the zone list from the current node and the gfp_mask.
131 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
133 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
134 * optimized to &contig_page_data at compile-time.
137 #ifndef HAVE_ARCH_FREE_PAGE
138 static inline void arch_free_page(struct page
*page
, int order
) { }
140 #ifndef HAVE_ARCH_ALLOC_PAGE
141 static inline void arch_alloc_page(struct page
*page
, int order
) { }
145 FASTCALL(__alloc_pages(gfp_t
, unsigned int, struct zonelist
*));
147 static inline struct page
*alloc_pages_node(int nid
, gfp_t gfp_mask
,
150 if (unlikely(order
>= MAX_ORDER
))
153 /* Unknown node is current node */
155 nid
= numa_node_id();
157 return __alloc_pages(gfp_mask
, order
,
158 NODE_DATA(nid
)->node_zonelists
+ gfp_zone(gfp_mask
));
162 extern struct page
*alloc_pages_current(gfp_t gfp_mask
, unsigned order
);
164 static inline struct page
*
165 alloc_pages(gfp_t gfp_mask
, unsigned int order
)
167 if (unlikely(order
>= MAX_ORDER
))
170 return alloc_pages_current(gfp_mask
, order
);
172 extern struct page
*alloc_page_vma(gfp_t gfp_mask
,
173 struct vm_area_struct
*vma
, unsigned long addr
);
175 #define alloc_pages(gfp_mask, order) \
176 alloc_pages_node(numa_node_id(), gfp_mask, order)
177 #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
179 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
181 extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask
, unsigned int order
));
182 extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask
));
184 #define __get_free_page(gfp_mask) \
185 __get_free_pages((gfp_mask),0)
187 #define __get_dma_pages(gfp_mask, order) \
188 __get_free_pages((gfp_mask) | GFP_DMA,(order))
190 extern void FASTCALL(__free_pages(struct page
*page
, unsigned int order
));
191 extern void FASTCALL(free_pages(unsigned long addr
, unsigned int order
));
192 extern void FASTCALL(free_hot_page(struct page
*page
));
193 extern void FASTCALL(free_cold_page(struct page
*page
));
195 #define __free_page(page) __free_pages((page), 0)
196 #define free_page(addr) free_pages((addr),0)
198 void page_alloc_init(void);
199 void drain_zone_pages(struct zone
*zone
, struct per_cpu_pages
*pcp
);
201 #endif /* __LINUX_GFP_H */