linux-kernel - [PATCH] x86: remove redundant local_irq_enable() after cpuidle_idle

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Date:	Wed, 14 Aug 2013 10:20:00 +0800
From:	Li Wang <li.wang@...driver.com>
To:	<tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
	<x86@...nel.org>, <linux-kernel@...r.kernel.org>
CC:	<li.wang@...driver.com>
Subject: [PATCH] x86: remove redundant local_irq_enable() after cpuidle_idle_call()

When cpuidle_idle_call() return 0, it shows that linux system is using
idle framwork driver. Now, local irq has already been enabled in
cpuidle_idle_call(). So, it need not enable local irq again, when return 0.

The code is introduced by commit:
97a5b81fa4d3a11dcdf224befc577f2e0abadc0b ("x86: Fix idle consolidation fallout")
In that defect, it does not use idle framework driver, just call amd_e400_idle().
That problem is that amd_e400_idle() does not enable irq.

Signed-off-by: Li Wang <li.wang@...driver.com>
---
 arch/x86/kernel/process.c |    2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 83369e5..cb55ee4 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -300,8 +300,6 @@ void arch_cpu_idle(void)
 {
 	if (cpuidle_idle_call())
 		x86_idle();
-	else
-		local_irq_enable();
 }

 /*
-- 
1.7.9.5

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