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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_PAGE_FRAG_CACHE_H#define _LINUX_PAGE_FRAG_CACHE_H
#include <linux/bits.h>#include <linux/log2.h>#include <linux/mm_types_task.h>#include <linux/types.h>
#if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE)/* Use a full byte here to enable assembler optimization as the shift * operation is usually expecting a byte. */#define PAGE_FRAG_CACHE_ORDER_MASK GENMASK(7, 0)#else/* Compiler should be able to figure out we don't read things as any value * ANDed with 0 is 0. */#define PAGE_FRAG_CACHE_ORDER_MASK 0#endif
#define PAGE_FRAG_CACHE_PFMEMALLOC_BIT (PAGE_FRAG_CACHE_ORDER_MASK + 1)
static inline bool encoded_page_decode_pfmemalloc(unsigned long encoded_page){ return !!(encoded_page & PAGE_FRAG_CACHE_PFMEMALLOC_BIT);}
static inline void page_frag_cache_init(struct page_frag_cache *nc){ nc->encoded_page = 0;}
static inline bool page_frag_cache_is_pfmemalloc(struct page_frag_cache *nc){ return encoded_page_decode_pfmemalloc(nc->encoded_page);}
void page_frag_cache_drain(struct page_frag_cache *nc);void __page_frag_cache_drain(struct page *page, unsigned int count);void *__page_frag_alloc_align(struct page_frag_cache *nc, unsigned int fragsz, gfp_t gfp_mask, unsigned int align_mask);
static inline void *page_frag_alloc_align(struct page_frag_cache *nc, unsigned int fragsz, gfp_t gfp_mask, unsigned int align){ WARN_ON_ONCE(!is_power_of_2(align)); return __page_frag_alloc_align(nc, fragsz, gfp_mask, -align);}
static inline void *page_frag_alloc(struct page_frag_cache *nc, unsigned int fragsz, gfp_t gfp_mask){ return __page_frag_alloc_align(nc, fragsz, gfp_mask, ~0u);}
void page_frag_free(void *addr);
#endif