diff mbox series

[6/6] sbitmap: check ws_active before check waitqueues

Message ID 20230720094555.1397621-7-chengming.zhou@linux.dev (mailing list archive)
State New, archived
Headers show
Series sbitmap: fix offset hint wrap and some optimizations | expand

Commit Message

Chengming Zhou July 20, 2023, 9:45 a.m. UTC 
From: Chengming Zhou <zhouchengming@bytedance.com>

When !ws_active, we don't need to check waitqueues at all. So add
this check in sbitmap_queue_wake_all(), like we do in
sbitmap_queue_wake_up().

Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
---
 lib/sbitmap.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/lib/sbitmap.c b/lib/sbitmap.c
index 6778ab3fc6a5..38c265e4ef9d 100644
--- a/lib/sbitmap.c
+++ b/lib/sbitmap.c
@@ -672,6 +672,10 @@  void sbitmap_queue_wake_all(struct sbitmap_queue *sbq)
 	 * sbitmap_queue_wake_up().
 	 */
 	smp_mb();
+
+	if (!atomic_read(&sbq->ws_active))
+		return;
+
 	wake_index = READ_ONCE(sbq->wake_index);
 	for (i = 0; i < SBQ_WAIT_QUEUES; i++) {
 		struct sbq_wait_state *ws = &sbq->ws[wake_index];