Commit 6e0678f3 authored by Matthew Dobson's avatar Matthew Dobson Committed by Linus Torvalds
Browse files

[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: default avatarMatthew Dobson <colpatch@us.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 8219dd57

include/linux/mempool.h

+12 −0
Original line number Diff line number Diff line
@@ -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 */

mm/mempool.c

+18 −0
Original line number Diff line number Diff line
@@ -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);