diff --git a/mm/mempool.c b/mm/mempool.c
index 905434f18c97..455d468c3a5d 100644
--- a/mm/mempool.c
+++ b/mm/mempool.c
@@ -192,6 +192,7 @@ EXPORT_SYMBOL(mempool_resize);
  * returns NULL. Note that due to preallocation, this function
  * *never* fails when called from process contexts. (it might
  * fail if called from an IRQ context.)
+ * Note: using __GFP_ZERO is not supported.
  */
 void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask)
 {
@@ -200,6 +201,7 @@ void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask)
 	wait_queue_t wait;
 	gfp_t gfp_temp;
 
+	VM_WARN_ON_ONCE(gfp_mask & __GFP_ZERO);
 	might_sleep_if(gfp_mask & __GFP_WAIT);
 
 	gfp_mask |= __GFP_NOMEMALLOC;	/* don't allocate emergency reserves */