To support early release of the maple tree locks, do not lockdep check
the lock if it is set to NULL. This is intended for the special case
on-stack use of tracking entries and not for general use.
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
---
include/linux/maple_tree.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h
index 7769270b85e8..6618c1512886 100644
--- a/include/linux/maple_tree.h
+++ b/include/linux/maple_tree.h
@@ -182,7 +182,9 @@ enum maple_type {
#ifdef CONFIG_LOCKDEP
typedef struct lockdep_map *lockdep_map_p;
-#define mt_lock_is_held(mt) lock_is_held(mt->ma_external_lock)
+#define mt_lock_is_held(mt) \
+ (!(mt)->ma_external_lock || lock_is_held((mt)->ma_external_lock))
+
#define mt_set_external_lock(mt, lock) \
(mt)->ma_external_lock = &(lock)->dep_map
#else
--
2.39.2
