slab: improve checking for invalid gfp_flags
The code goes BUG, but doesn't tell us which bits were unexpectedly set.
Print that out.
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/slub.c b/mm/slub.c
index cf4f3c4..386bbed 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1377,7 +1377,10 @@
int order;
int idx;
- BUG_ON(flags & GFP_SLAB_BUG_MASK);
+ if (unlikely(flags & GFP_SLAB_BUG_MASK)) {
+ pr_emerg("gfp: %u\n", flags & GFP_SLAB_BUG_MASK);
+ BUG();
+ }
page = allocate_slab(s,
flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node);