#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	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_DMA32static inline enum zone_type gfp_zone(gfp_t flags){	if (flags & __GFP_DMA)		return ZONE_DMA;#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_PAGEstatic inline void arch_free_page(struct page *page, int order) { }#endif#ifndef HAVE_ARCH_ALLOC_PAGEstatic inline void arch_alloc_page(struct page *page, int order) { }#endifextern 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_NUMAextern 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_NUMAvoid drain_node_pages(int node);#elsestatic inline void drain_node_pages(int node) { };#endif#endif /* __LINUX_GFP_H */