linux-kernel - [PATCH 07/10] cpuidle: Remove unnecessary current_clr_polling() on poll

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 11 Aug 2023 19:00:46 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>
Subject: [PATCH 07/10] cpuidle: Remove unnecessary current_clr_polling() on poll_idle()

There is no point in clearing TIF_NR_POLLING and folding TIF_NEED_RESCHED
upon poll_idle() exit because cpuidle_idle_call() is going to set again
TIF_NR_POLLING anyway. Also if TIF_NEED_RESCHED is set, it will be
folded and TIF_NR_POLLING will be cleared at the end of do_idle().

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
---
 drivers/cpuidle/poll_state.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/cpuidle/poll_state.c b/drivers/cpuidle/poll_state.c
index 009f46f121ae..44a656464d06 100644
--- a/drivers/cpuidle/poll_state.c
+++ b/drivers/cpuidle/poll_state.c
@@ -48,8 +48,6 @@ static int __cpuidle poll_idle(struct cpuidle_device *dev,
 	}
 	raw_local_irq_disable();
 
-	current_clr_polling();
-
 	return index;
 }
 
-- 
2.34.1