linux-kernel - [tip:x86/urgent] x86: Fix idle consolidation fallout

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Message-ID: <tip-97a5b81fa4d3a11dcdf224befc577f2e0abadc0b@git.kernel.org>
Date:	Tue, 7 May 2013 07:32:16 -0700
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	markus@...ppelsdorf.de, tglx@...utronix.de, bp@...en8.de
Subject: [tip:x86/urgent] x86: Fix idle consolidation fallout

Commit-ID:  97a5b81fa4d3a11dcdf224befc577f2e0abadc0b
Gitweb:     http://git.kernel.org/tip/97a5b81fa4d3a11dcdf224befc577f2e0abadc0b
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Thu, 2 May 2013 16:21:15 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 7 May 2013 16:24:03 +0200

x86: Fix idle consolidation fallout

The core code expects the arch idle code to return with interrupts
enabled. The conversion missed two x86 cases which fail to do that.

Reported-and-tested-by: Markus Trippelsdorf <markus@...ppelsdorf.de>
Tested-by: Borislav Petkov <bp@...en8.de>
Link: http://lkml.kernel.org/r/alpine.LFD.2.02.1305021557030.3972@ionos
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/kernel/process.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 607af0d..4e7a37f 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -312,6 +312,8 @@ void arch_cpu_idle(void)
 {
 	if (cpuidle_idle_call())
 		x86_idle();
+	else
+		local_irq_enable();
 }
 
 /*
@@ -368,9 +370,6 @@ void amd_e400_remove_cpu(int cpu)
  */
 static void amd_e400_idle(void)
 {
-	if (need_resched())
-		return;
-
 	if (!amd_e400_c1e_detected) {
 		u32 lo, hi;
 
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