mm/zbud.c: make size unsigned like unique callsite

zbud_alloc is only called by zswap_frontswap_store with unsigned int len.
Change function parameter + update >= 0 check.

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Acked-by: Seth Jennings <sjennings@variantweb.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/zbud.h b/include/linux/zbud.h
index 2571a5cfa5fc34bcfe0612eee851db7f91570e47..13af0d450bf6e088fc2b603fc0be2c35d8cbf7f6 100644 (file)
--- a/include/linux/zbud.h
+++ b/include/linux/zbud.h
@@ -11,7 +11,7 @@ struct zbud_ops {
 
 struct zbud_pool *zbud_create_pool(gfp_t gfp, struct zbud_ops *ops);
 void zbud_destroy_pool(struct zbud_pool *pool);
-int zbud_alloc(struct zbud_pool *pool, int size, gfp_t gfp,
+int zbud_alloc(struct zbud_pool *pool, unsigned int size, gfp_t gfp,
        unsigned long *handle);
 void zbud_free(struct zbud_pool *pool, unsigned long handle);
 int zbud_reclaim_page(struct zbud_pool *pool, unsigned int retries);

diff --git a/mm/zbud.c b/mm/zbud.c
index 9451361e6aa701557e9d028e738e9d6e3024756f..01df13a7e2e1e51bdd0ea5c8d06e3aad1d65d066 100644 (file)
--- a/mm/zbud.c
+++ b/mm/zbud.c
@@ -247,7 +247,7 @@ void zbud_destroy_pool(struct zbud_pool *pool)
  * gfp arguments are invalid or -ENOMEM if the pool was unable to allocate
  * a new page.
  */
-int zbud_alloc(struct zbud_pool *pool, int size, gfp_t gfp,
+int zbud_alloc(struct zbud_pool *pool, unsigned int size, gfp_t gfp,
                        unsigned long *handle)
 {
        int chunks, i, freechunks;
@@ -255,7 +255,7 @@ int zbud_alloc(struct zbud_pool *pool, int size, gfp_t gfp,
        enum buddy bud;
        struct page *page;
 
-       if (size <= 0 || gfp & __GFP_HIGHMEM)
+       if (!size || (gfp & __GFP_HIGHMEM))
                return -EINVAL;
        if (size > PAGE_SIZE - ZHDR_SIZE_ALIGNED - CHUNK_SIZE)
                return -ENOSPC;