1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
134 lines
4.5 KiB
C
134 lines
4.5 KiB
C
#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 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_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
|
|
|
|
|
|
/*
|
|
* 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 __nocast 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 int __nocast gfp_mask, unsigned order);
|
|
|
|
static inline struct page *
|
|
alloc_pages(unsigned int __nocast 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 __nocast 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 __nocast gfp_mask, unsigned int order));
|
|
extern unsigned long FASTCALL(get_zeroed_page(unsigned int __nocast 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 */
|