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authorDavid Rientjes <rientjes@google.com>2014-02-10 14:25:39 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-02-10 16:01:41 -0800
commit255d0884f5635122adb23866b242b4ca112f4bc8 (patch)
tree8ade02c6988352329f52b961d776623f363cab7c /mm
parentbd180b4e2b0d5b8f14978e295741e69e6a01d398 (diff)
downloadlinux-255d0884f5635122adb23866b242b4ca112f4bc8.tar.gz
mm/slub.c: list_lock may not be held in some circumstances
Commit c65c1877bd68 ("slub: use lockdep_assert_held") incorrectly required that add_full() and remove_full() hold n->list_lock. The lock is only taken when kmem_cache_debug(s), since that's the only time it actually does anything. Require that the lock only be taken under such a condition. Reported-by: Larry Finger <Larry.Finger@lwfinger.net> Tested-by: Larry Finger <Larry.Finger@lwfinger.net> Tested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/slub.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/mm/slub.c b/mm/slub.c
index 7e3e0458bce..3d3a8a7a0f8 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1004,21 +1004,19 @@ static inline void slab_free_hook(struct kmem_cache *s, void *x)
static void add_full(struct kmem_cache *s,
struct kmem_cache_node *n, struct page *page)
{
- lockdep_assert_held(&n->list_lock);
-
if (!(s->flags & SLAB_STORE_USER))
return;
+ lockdep_assert_held(&n->list_lock);
list_add(&page->lru, &n->full);
}
static void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, struct page *page)
{
- lockdep_assert_held(&n->list_lock);
-
if (!(s->flags & SLAB_STORE_USER))
return;
+ lockdep_assert_held(&n->list_lock);
list_del(&page->lru);
}