diff options
| -rw-r--r-- | mm/slub.c | 11 |
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; |