1 files changed, 11 insertions, 0 deletions

diff --git a/mm/slub.c b/mm/slub.c
index 3e8afcc07a76..fa86e5845093 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4604,6 +4604,14 @@ static ssize_t trace_show(struct kmem_cache *s, char *buf)
 static ssize_t trace_store(struct kmem_cache *s, const char *buf,
                                                         size_t length)
 {
+        /*
+         * Tracing a merged cache is going to give confusing results
+         * as well as cause other issues like converting a mergeable
+         * cache into an umergeable one.
+         */
+        if (s->refcount > 1)
+                return -EINVAL;
+
         s->flags &= ~SLAB_TRACE;
         if (buf[0] == '1') {
                 s->flags &= ~__CMPXCHG_DOUBLE;
@@ -4721,6 +4729,9 @@ static ssize_t failslab_show(struct kmem_cache *s, char *buf)
 static ssize_t failslab_store(struct kmem_cache *s, const char *buf,
                                                         size_t length)
 {
+        if (s->refcount > 1)
+                return -EINVAL;
+
         s->flags &= ~SLAB_FAILSLAB;
         if (buf[0] == '1')
                 s->flags |= SLAB_FAILSLAB;