mm: zpool: constify the zpool_ops

The structure zpool_ops is not modified so make the pointer to it a
pointer to const.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/zpool.h b/include/linux/zpool.h
index d30eff3..c924a28 100644
--- a/include/linux/zpool.h
+++ b/include/linux/zpool.h
@@ -37,7 +37,7 @@
 };
 
 struct zpool *zpool_create_pool(char *type, char *name,
-			gfp_t gfp, struct zpool_ops *ops);
+			gfp_t gfp, const struct zpool_ops *ops);
 
 char *zpool_get_type(struct zpool *pool);
 
@@ -81,7 +81,7 @@
 	atomic_t refcount;
 	struct list_head list;
 
-	void *(*create)(char *name, gfp_t gfp, struct zpool_ops *ops,
+	void *(*create)(char *name, gfp_t gfp, const struct zpool_ops *ops,
 			struct zpool *zpool);
 	void (*destroy)(void *pool);