Add a VM_BUG_ON to catch any illegal value from the shrinkers. It's a
potential bug if scan_objects returns a negative other than -1 and
would lead to undefined behaviour.
Cc: Glauber Costa <glom...@openvz.org>
Cc: Dave Chinner <dchin...@redhat.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Hugh Dickins <hu...@google.com>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: Oskar Andero <oskar.and...@sonymobile.com>
---
mm/vmscan.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 6bac41e..63fec86 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -293,6 +293,7 @@ shrink_slab_one(struct shrinker *shrinker, struct
shrink_control *shrinkctl,
ret = shrinker->scan_objects(shrinker, shrinkctl);
if (ret == -1)
break;
+ VM_BUG_ON(ret < -1);
freed += ret;
count_vm_events(SLABS_SCANNED, nr_to_scan);
--
1.8.1.5
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