[PATCH] rcu: Stop shrinker loop

[Peter Enderborg]

The count and scan can be separated in time. It is a fair chance
that all work is already done when the scan starts. It
then might retry. This is can be avoided with returning SHRINK_STOP.

Signed-off-by: Peter Enderborg <peter.enderborg@xxxxxxxx>
---
 kernel/rcu/tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index c716eadc7617..8b36c6b2887d 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3310,7 +3310,7 @@ kfree_rcu_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
 			break;
 	}
 
-	return freed;
+	return freed == 0 ? SHRINK_STOP : freed;
 }
 
 static struct shrinker kfree_rcu_shrinker = {
-- 
2.17.1