mm/slub: add missing annotation for get_map()

Sparse reports a warning at get_map()()

 warning: context imbalance in get_map() - wrong count at exit

The root cause is the missing annotation at get_map()
Add the missing __acquires(&object_map_lock) annotation

Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20200214204741.94112-9-jbi.octave@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/slub.c b/mm/slub.c
index 3098e0c..c6d6036 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -449,6 +449,7 @@ static DEFINE_SPINLOCK(object_map_lock);
  * not vanish from under us.
  */
 static unsigned long *get_map(struct kmem_cache *s, struct page *page)
+       __acquires(&object_map_lock)
 {
        void *p;
        void *addr = page_address(page);