linux-kernel - [PATCH 3/4] x86: Remove __current_clr_polling() from mwait

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Message-ID: <20231115151325.6262-4-frederic@kernel.org>
Date:   Wed, 15 Nov 2023 10:13:24 -0500
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        "Rafael J . Wysocki" <rafael@...nel.org>
Subject: [PATCH 3/4] x86: Remove __current_clr_polling() from mwait_idle()

mwait_idle() is only ever called through by cpuidle, either from
default_idle_call() or from cpuidle_enter(). In any case
cpuidle_idle_call() sets again TIF_NR_POLLING after calling it so there
is no point for this atomic operation upon idle exit.

Acked-by: Rafael J. Wysocki <rafael@...nel.org>
Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
---
 arch/x86/kernel/process.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index b6f4e8399fca..fc7a38084606 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -930,7 +930,6 @@ static __cpuidle void mwait_idle(void)
 			raw_local_irq_disable();
 		}
 	}
-	__current_clr_polling();
 }
 
 void select_idle_routine(const struct cpuinfo_x86 *c)
-- 
2.42.1