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 * These may be masked by GFP_ZONEMASK to make allocations with this bit
16 * set fall back to ZONE_NORMAL.
18 * Do not put any conditional on these. If necessary modify the definitions
19 * without the underscores and use the consistently. The definitions here may
20 * be used in bit comparisons.
22 #define __GFP_DMA ((__force gfp_t)0x01u)
23 #define __GFP_HIGHMEM ((__force gfp_t)0x02u)
24 #define __GFP_DMA32 ((__force gfp_t)0x04u)
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 #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_NO_GROW ((__force gfp_t)0x2000u)/* Slab internal usage */
47 #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */
48 #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */
49 #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
50 #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
52 #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */
53 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
55 /* if you forget to add the bitmask here kernel will crash, period */
56 #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \
57 __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \
58 __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \
59 __GFP_NOMEMALLOC|__GFP_HARDWALL)
61 /* This equals 0, but use constants in case they ever change */
62 #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
63 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
64 #define GFP_ATOMIC (__GFP_HIGH)
65 #define GFP_NOIO (__GFP_WAIT)
66 #define GFP_NOFS (__GFP_WAIT | __GFP_IO)
67 #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
68 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
69 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
72 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
73 platforms, used as appropriate on others */
75 #define GFP_DMA __GFP_DMA
77 /* 4GB DMA on some platforms */
78 #define GFP_DMA32 __GFP_DMA32
81 static inline int gfp_zone(gfp_t gfp)
83 int zone = GFP_ZONEMASK & (__force int) gfp;
84 BUG_ON(zone >= GFP_ZONETYPES);
88 static inline enum zone_type highest_zone(gfp_t flags)
90 if (flags & __GFP_DMA)
92 #ifdef CONFIG_ZONE_DMA32
93 if (flags & __GFP_DMA32)
97 if (flags & __GFP_HIGHMEM)
104 * There is only one page-allocator function, and two main namespaces to
105 * it. The alloc_page*() variants return 'struct page *' and as such
106 * can allocate highmem pages, the *get*page*() variants return
107 * virtual kernel addresses to the allocated page(s).
111 * We get the zone list from the current node and the gfp_mask.
112 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
114 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
115 * optimized to &contig_page_data at compile-time.
118 #ifndef HAVE_ARCH_FREE_PAGE
119 static inline void arch_free_page(struct page *page, int order) { }
123 FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *));
125 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
128 if (unlikely(order >= MAX_ORDER))
131 /* Unknown node is current node */
133 nid = numa_node_id();
135 return __alloc_pages(gfp_mask, order,
136 NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask));
140 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
142 static inline struct page *
143 alloc_pages(gfp_t gfp_mask, unsigned int order)
145 if (unlikely(order >= MAX_ORDER))
148 return alloc_pages_current(gfp_mask, order);
150 extern struct page *alloc_page_vma(gfp_t gfp_mask,
151 struct vm_area_struct *vma, unsigned long addr);
153 #define alloc_pages(gfp_mask, order) \
154 alloc_pages_node(numa_node_id(), gfp_mask, order)
155 #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
157 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
159 extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order));
160 extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask));
162 #define __get_free_page(gfp_mask) \
163 __get_free_pages((gfp_mask),0)
165 #define __get_dma_pages(gfp_mask, order) \
166 __get_free_pages((gfp_mask) | GFP_DMA,(order))
168 extern void FASTCALL(__free_pages(struct page *page, unsigned int order));
169 extern void FASTCALL(free_pages(unsigned long addr, unsigned int order));
170 extern void FASTCALL(free_hot_page(struct page *page));
171 extern void FASTCALL(free_cold_page(struct page *page));
173 #define __free_page(page) __free_pages((page), 0)
174 #define free_page(addr) free_pages((addr),0)
176 void page_alloc_init(void);
178 void drain_node_pages(int node);
180 static inline void drain_node_pages(int node) { };
183 #endif /* __LINUX_GFP_H */