#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 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	0x10u	/* Can wait and reschedule? */#define __GFP_HIGH	0x20u	/* Should access emergency pools? */#define __GFP_IO	0x40u	/* Can start physical IO? */#define __GFP_FS	0x80u	/* Can call down to low-level FS? */#define __GFP_COLD	0x100u	/* Cache-cold page required */#define __GFP_NOWARN	0x200u	/* Suppress page allocation failure warning */#define __GFP_REPEAT	0x400u	/* Retry the allocation.  Might fail */#define __GFP_NOFAIL	0x800u	/* Retry for ever.  Cannot fail */#define __GFP_NORETRY	0x1000u	/* Do not retry.  Might fail */#define __GFP_NO_GROW	0x2000u	/* Slab internal usage */#define __GFP_COMP	0x4000u	/* Add compound page metadata */#define __GFP_ZERO	0x8000u	/* Return zeroed page on success */#define __GFP_NOMEMALLOC 0x10000u /* Don't use emergency reserves */#define __GFP_BITS_SHIFT 20	/* Room for 20 __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| \			__GFP_NOMEMALLOC)#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/* * 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_PAGEstatic inline void arch_free_page(struct page *page, int order) { }#endifextern 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_NUMAextern struct page *alloc_pages_current(unsigned int 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 /* __LINUX_GFP_H */