From 6e0678f394c7bd21bfa5d252b071a09e10e7a749 Mon Sep 17 00:00:00 2001 From: Matthew Dobson Date: Sun, 26 Mar 2006 01:37:44 -0800 Subject: [PATCH] [PATCH] mempool: add page allocator This will be used by the next patch in the series to replace duplicate mempool-backed page allocators in 2 places in the kernel. It is also likely that there will be more users in the future. Signed-off-by: Matthew Dobson Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/mempool.h | 12 ++++++++++++ mm/mempool.c | 18 ++++++++++++++++++ 2 files changed, 30 insertions(+) diff --git a/include/linux/mempool.h b/include/linux/mempool.h index f2427d7394b0..9787572e0ae7 100644 --- a/include/linux/mempool.h +++ b/include/linux/mempool.h @@ -38,4 +38,16 @@ extern void mempool_free(void *element, mempool_t *pool); void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data); void mempool_free_slab(void *element, void *pool_data); +/* + * A mempool_alloc_t and mempool_free_t for a simple page allocator that + * allocates pages of the order specified by pool_data + */ +void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data); +void mempool_free_pages(void *element, void *pool_data); +static inline mempool_t *mempool_create_page_pool(int min_nr, int order) +{ + return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages, + (void *)(long)order); +} + #endif /* _LINUX_MEMPOOL_H */ diff --git a/mm/mempool.c b/mm/mempool.c index f71893ed3543..45c0112ca7b2 100644 --- a/mm/mempool.c +++ b/mm/mempool.c @@ -289,3 +289,21 @@ void mempool_free_slab(void *element, void *pool_data) kmem_cache_free(mem, element); } EXPORT_SYMBOL(mempool_free_slab); + +/* + * A simple mempool-backed page allocator that allocates pages + * of the order specified by pool_data. + */ +void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data) +{ + int order = (int)(long)pool_data; + return alloc_pages(gfp_mask, order); +} +EXPORT_SYMBOL(mempool_alloc_pages); + +void mempool_free_pages(void *element, void *pool_data) +{ + int order = (int)(long)pool_data; + __free_pages(element, order); +} +EXPORT_SYMBOL(mempool_free_pages); -- 2.20.1