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- #ifndef __LINUX_GFP_H
- #define __LINUX_GFP_H
-
- #include <linux/mmzone.h>
- #include <linux/stddef.h>
- #include <linux/linkage.h>
- #include <linux/config.h>
-
- struct vm_area_struct;
-
- /*
- * GFP bitmasks..
- */
- /* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low two bits) */
- #define __GFP_DMA 0x01
- #define __GFP_HIGHMEM 0x02
-
- /*
- * 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 0x10 /* Can wait and reschedule? */
- #define __GFP_HIGH 0x20 /* Should access emergency pools? */
- #define __GFP_IO 0x40 /* Can start physical IO? */
- #define __GFP_FS 0x80 /* Can call down to low-level FS? */
- #define __GFP_COLD 0x100 /* Cache-cold page required */
- #define __GFP_NOWARN 0x200 /* Suppress page allocation failure warning */
- #define __GFP_REPEAT 0x400 /* Retry the allocation. Might fail */
- #define __GFP_NOFAIL 0x800 /* Retry for ever. Cannot fail */
- #define __GFP_NORETRY 0x1000 /* Do not retry. Might fail */
- #define __GFP_NO_GROW 0x2000 /* Slab internal usage */
- #define __GFP_COMP 0x4000 /* Add compound page metadata */
- #define __GFP_ZERO 0x8000 /* Return zeroed page on success */
-
- #define __GFP_BITS_SHIFT 16 /* Room for 16 __GFP_FOO bits */
- #define __GFP_BITS_MASK ((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)
-
- #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)
- #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HIGHMEM)
-
- /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
- platforms, used as appropriate on others */
-
- #define GFP_DMA __GFP_DMA
-
- #ifdef __KERNEL__
-
- /*
- * 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
-
- extern struct page *
- FASTCALL(__alloc_pages(unsigned int, unsigned int, struct zonelist *));
-
- static inline struct page *alloc_pages_node(int nid, unsigned int gfp_mask,
- unsigned int order)
- {
- if (unlikely(order >= MAX_ORDER))
- return NULL;
-
- return __alloc_pages(gfp_mask, order,
- NODE_DATA(nid)->node_zonelists + (gfp_mask & GFP_ZONEMASK));
- }
-
- #ifdef CONFIG_NUMA
- extern struct page *alloc_pages_current(unsigned gfp_mask, unsigned order);
-
- static inline struct page *
- alloc_pages(unsigned int 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(unsigned 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(unsigned int gfp_mask, unsigned int order));
- extern unsigned long FASTCALL(get_zeroed_page(unsigned int 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);
-
- #endif /* __KERNEL__ */
- #endif /* __LINUX_GFP_H */
-