diff --git a/mm/slab.c b/mm/slab.c
index 763096a247f64d5532abf64693c4005625e8173e..03fb724d6e48f405afe76e025a2b208184c0af7c 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2686,7 +2686,8 @@ static struct page *cache_grow_begin(struct kmem_cache *cachep,
 	 * critical path in kmem_cache_alloc().
 	 */
 	if (unlikely(flags & GFP_SLAB_BUG_MASK)) {
-		pr_emerg("gfp: %u\n", flags & GFP_SLAB_BUG_MASK);
+		gfp_t invalid_mask = flags & GFP_SLAB_BUG_MASK;
+		pr_emerg("Unexpected gfp: %#x (%pGg)\n", invalid_mask, &invalid_mask);
 		BUG();
 	}
 	local_flags = flags & (GFP_CONSTRAINT_MASK|GFP_RECLAIM_MASK);
diff --git a/mm/slub.c b/mm/slub.c
index f5b3114b6a97871e9fd644bd7ac6af443cef0136..a2fe4edc3599d9e54581bcbca3655de6db49ebe2 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1612,7 +1612,8 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
 static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
 {
 	if (unlikely(flags & GFP_SLAB_BUG_MASK)) {
-		pr_emerg("gfp: %u\n", flags & GFP_SLAB_BUG_MASK);
+		gfp_t invalid_mask = flags & GFP_SLAB_BUG_MASK;
+		pr_emerg("Unexpected gfp: %#x (%pGg)\n", invalid_mask, &invalid_mask);
 		BUG();
 	}