linux-kernel - [PATCH 07/21] io_uring: Remove redundant hrtimer's callback function setup

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Message-Id: <61a7783e6359b77338f6b2e87c1f19de4b3508de.1729864615.git.namcao@linutronix.de>
Date: Mon, 28 Oct 2024 08:29:26 +0100
From: Nam Cao <namcao@...utronix.de>
To: Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Frederic Weisbecker <frederic@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Kees Cook <kees@...nel.org>,
	linux-kernel@...r.kernel.org
Cc: Nam Cao <namcao@...utronix.de>,
	Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 07/21] io_uring: Remove redundant hrtimer's callback function setup

The IORING_OP_TIMEOUT command uses hrtimer underneath. The timer's callback
function is setup in io_timeout(), and then the callback function is setup
again when the timer is rearmed.

Since the callback function is the same for both cases, the latter setup is
redundant, therefore remove it.

Signed-off-by: Nam Cao <namcao@...utronix.de>
---
Cc: Jens Axboe <axboe@...nel.dk>
---
 io_uring/timeout.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/io_uring/timeout.c b/io_uring/timeout.c
index 9973876d91b0..2ffe5e1dc68a 100644
--- a/io_uring/timeout.c
+++ b/io_uring/timeout.c
@@ -76,7 +76,6 @@ static void io_timeout_complete(struct io_kiocb *req, struct io_tw_state *ts)
 			/* re-arm timer */
 			spin_lock_irq(&ctx->timeout_lock);
 			list_add(&timeout->list, ctx->timeout_list.prev);
-			data->timer.function = io_timeout_fn;
 			hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode);
 			spin_unlock_irq(&ctx->timeout_lock);
 			return;
-- 
2.39.5