slub/memcg: cure the brainless abuse of sysfs attributes

[karo-tx-linux.git] / mm / slub.c

diff --git a/mm/slub.c b/mm/slub.c
index 57e5156f02be6bcc23e70ec801e9cc1c3bbdd631..7449593fca724147cef5b8f7a46752333e5e0585 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -5512,6 +5512,7 @@ static void memcg_propagate_slab_attrs(struct kmem_cache *s)
                char mbuf[64];
                char *buf;
                struct slab_attribute *attr = to_slab_attr(slab_attrs[i]);
+               ssize_t len;
 
                if (!attr || !attr->store || !attr->show)
                        continue;
@@ -5536,8 +5537,9 @@ static void memcg_propagate_slab_attrs(struct kmem_cache *s)
                        buf = buffer;
                }
 
-               attr->show(root_cache, buf);
-               attr->store(s, buf, strlen(buf));
+               len = attr->show(root_cache, buf);
+               if (len > 0)
+                       attr->store(s, buf, len);
        }
 
        if (buffer)