From: Pavel Begunkov <asml.silence@gmail.com>
Date: Wed, 8 Sep 2021 15:40:53 +0000 (+0100)
Subject: io_uring: kill extra wake_up_process in tw add
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d97ec6239ad8684e4d31b12b39cefca6782c09a3;p=linux.git

io_uring: kill extra wake_up_process in tw add

TWA_SIGNAL already wakes the thread, no need in wake_up_process() after
it.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/7e90cf643f633e857443e0c9e72471b221735c50.1631115443.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/fs/io_uring.c b/fs/io_uring.c
index c4ec3672da77b..ead85f4d34272 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2197,8 +2197,9 @@ static void io_req_task_work_add(struct io_kiocb *req)
 	 * will do the job.
 	 */
 	notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL;
-	if (!task_work_add(tsk, &tctx->task_work, notify)) {
-		wake_up_process(tsk);
+	if (likely(!task_work_add(tsk, &tctx->task_work, notify))) {
+		if (notify == TWA_NONE)
+			wake_up_process(tsk);
 		return;
 	}