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authorAndrew Morton <akpm@linux-foundation.org>2014-12-10 15:42:25 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-10 17:41:04 -0800
commitc871ac4e9666ad68ae861172ef8a7f73d6e61b26 (patch)
tree4ca2000cf5e0c663f1b70efadf38127fa7b59b7c
parentf6edde9cbe0634e4391b6e421a609ca3f57f6c38 (diff)
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>
-rw-r--r--mm/slab.c5
-rw-r--r--mm/slub.c5
2 files changed, 8 insertions, 2 deletions
diff --git a/mm/slab.c b/mm/slab.c
index a2152a2573dd..79e15f0a2a6e 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2590,7 +2590,10 @@ static int cache_grow(struct kmem_cache *cachep,
* Be lazy and only check for valid flags here, keeping it out of the
* critical path in kmem_cache_alloc().
*/
- 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();
+ }
local_flags = flags & (GFP_CONSTRAINT_MASK|GFP_RECLAIM_MASK);
/* Take the node list lock to change the colour_next on this node */
diff --git a/mm/slub.c b/mm/slub.c
index cf4f3c480b98..386bbed76e94 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1377,7 +1377,10 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
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);