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- #ifndef __LINUX_GFP_H
- #define __LINUX_GFP_H
- #include <linux/mmzone.h>
- #include <linux/stddef.h>
- #include <linux/linkage.h>
- struct vm_area_struct;
- /*
- * GFP bitmasks..
- *
- * Zone modifiers (see linux/mmzone.h - low three bits)
- *
- * Do not put any conditional on these. If necessary modify the definitions
- * without the underscores and use the consistently. The definitions here may
- * be used in bit comparisons.
- */
- #define __GFP_DMA ((__force gfp_t)0x01u)
- #define __GFP_HIGHMEM ((__force gfp_t)0x02u)
- #define __GFP_DMA32 ((__force gfp_t)0x04u)
- /*
- * Action modifiers - doesn't change the zoning
- *
- * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
- * _might_ fail. This depends upon the particular VM implementation.
- *
- * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
- * cannot handle allocation failures.
- *
- * __GFP_NORETRY: The VM implementation must not retry indefinitely.
- */
- #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */
- #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */
- #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */
- #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */
- #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */
- #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */
- #define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */
- #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */
- #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */
- #define __GFP_NO_GROW ((__force gfp_t)0x2000u)/* Slab internal usage */
- #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */
- #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */
- #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
- #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
- #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */
- #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */
- #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
- /* if you forget to add the bitmask here kernel will crash, period */
- #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \
- __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \
- __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \
- __GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_THISNODE)
- /* This equals 0, but use constants in case they ever change */
- #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
- /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
- #define GFP_ATOMIC (__GFP_HIGH)
- #define GFP_NOIO (__GFP_WAIT)
- #define GFP_NOFS (__GFP_WAIT | __GFP_IO)
- #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
- #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
- #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
- __GFP_HIGHMEM)
- #ifdef CONFIG_NUMA
- #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
- #else
- #define GFP_THISNODE ((__force gfp_t)0)
- #endif
- /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
- platforms, used as appropriate on others */
- #define GFP_DMA __GFP_DMA
- /* 4GB DMA on some platforms */
- #define GFP_DMA32 __GFP_DMA32
- static inline enum zone_type gfp_zone(gfp_t flags)
- {
- #ifdef CONFIG_ZONE_DMA
- if (flags & __GFP_DMA)
- return ZONE_DMA;
- #endif
- #ifdef CONFIG_ZONE_DMA32
- if (flags & __GFP_DMA32)
- return ZONE_DMA32;
- #endif
- #ifdef CONFIG_HIGHMEM
- if (flags & __GFP_HIGHMEM)
- return ZONE_HIGHMEM;
- #endif
- return ZONE_NORMAL;
- }
- /*
- * There is only one page-allocator function, and two main namespaces to
- * it. The alloc_page*() variants return 'struct page *' and as such
- * can allocate highmem pages, the *get*page*() variants return
- * virtual kernel addresses to the allocated page(s).
- */
- /*
- * We get the zone list from the current node and the gfp_mask.
- * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
- *
- * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
- * optimized to &contig_page_data at compile-time.
- */
- #ifndef HAVE_ARCH_FREE_PAGE
- static inline void arch_free_page(struct page *page, int order) { }
- #endif
- #ifndef HAVE_ARCH_ALLOC_PAGE
- static inline void arch_alloc_page(struct page *page, int order) { }
- #endif
- extern struct page *
- FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *));
- static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
- unsigned int order)
- {
- if (unlikely(order >= MAX_ORDER))
- return NULL;
- /* Unknown node is current node */
- if (nid < 0)
- nid = numa_node_id();
- return __alloc_pages(gfp_mask, order,
- NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask));
- }
- #ifdef CONFIG_NUMA
- extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
- static inline struct page *
- alloc_pages(gfp_t gfp_mask, unsigned int order)
- {
- if (unlikely(order >= MAX_ORDER))
- return NULL;
- return alloc_pages_current(gfp_mask, order);
- }
- extern struct page *alloc_page_vma(gfp_t gfp_mask,
- struct vm_area_struct *vma, unsigned long addr);
- #else
- #define alloc_pages(gfp_mask, order) \
- alloc_pages_node(numa_node_id(), gfp_mask, order)
- #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
- #endif
- #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
- extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order));
- extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask));
- #define __get_free_page(gfp_mask) \
- __get_free_pages((gfp_mask),0)
- #define __get_dma_pages(gfp_mask, order) \
- __get_free_pages((gfp_mask) | GFP_DMA,(order))
- extern void FASTCALL(__free_pages(struct page *page, unsigned int order));
- extern void FASTCALL(free_pages(unsigned long addr, unsigned int order));
- extern void FASTCALL(free_hot_page(struct page *page));
- extern void FASTCALL(free_cold_page(struct page *page));
- #define __free_page(page) __free_pages((page), 0)
- #define free_page(addr) free_pages((addr),0)
- void page_alloc_init(void);
- #ifdef CONFIG_NUMA
- void drain_node_pages(int node);
- #else
- static inline void drain_node_pages(int node) { };
- #endif
- #endif /* __LINUX_GFP_H */
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