From: Matthew Dobson 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 --- include/linux/mempool.h | 12 ++++++++++++ mm/mempool.c | 18 ++++++++++++++++++ 2 files changed, 30 insertions(+) diff -puN include/linux/mempool.h~mempool-add-page-allocator include/linux/mempool.h --- devel/include/linux/mempool.h~mempool-add-page-allocator 2006-02-10 02:14:19.000000000 -0800 +++ devel-akpm/include/linux/mempool.h 2006-02-10 02:14:21.000000000 -0800 @@ -38,4 +38,16 @@ extern void mempool_free(void *element, 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 -puN mm/mempool.c~mempool-add-page-allocator mm/mempool.c --- devel/mm/mempool.c~mempool-add-page-allocator 2006-02-10 02:14:19.000000000 -0800 +++ devel-akpm/mm/mempool.c 2006-02-10 02:14:22.000000000 -0800 @@ -289,3 +289,21 @@ void mempool_free_slab(void *element, vo 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); _