lockref: add a __cond_lock annotation for lockref_put_or_lock

Add a cond_lock annotation for lockref_put_or_lock to make sparse
happy with using it.  Note that for this the return value has to be
double-inverted as the return value convention of lockref_put_or_lock
is inverted compared to _trylock conventions expected by __cond_lock,
as lockref_put_or_lock returns true when it did not need to take the
lock.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/lockref.h b/include/linux/lockref.h
index 676721ee878d..815d871fadfc 100644
--- a/include/linux/lockref.h
+++ b/include/linux/lockref.h
@@ -50,6 +50,8 @@ void lockref_get(struct lockref *lockref);
 int lockref_put_return(struct lockref *lockref);
 bool lockref_get_not_zero(struct lockref *lockref);
 bool lockref_put_or_lock(struct lockref *lockref);
+#define lockref_put_or_lock(_lockref) \
+	(!__cond_lock((_lockref)->lock, !lockref_put_or_lock(_lockref)))
 
 void lockref_mark_dead(struct lockref *lockref);
 bool lockref_get_not_dead(struct lockref *lockref);