In case CONFIG_SLUB_DEBUG_ON=n find_mergeable() gets debug features
from commandline but never checks if there are features from the
SLAB_NEVER_MERGE set.
As a result selected by slub_debug caches are always mergeable if they
have been created without a custom constructor set or without one of the
SLAB_* debug features on.
This adds the necessary check and makes selected slab caches unmergeable
if one of the SLAB_NEVER_MERGE features is set from commandline.
Signed-off-by: Grygorii Maistrenko <grygoriimkd@xxxxxxxxx>
---
mm/slab_common.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 329b03843863..7341cba8c58b 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -266,6 +266,9 @@ struct kmem_cache *find_mergeable(size_t size, size_t align,
size = ALIGN(size, align);
flags = kmem_cache_flags(size, flags, name, NULL);
+ if (flags & SLAB_NEVER_MERGE)
+ return NULL;
+
list_for_each_entry_reverse(s, &slab_caches, list) {
if (slab_unmergeable(s))
continue;
--
2.11.0
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>