linux-kernel - [PATCH v7 1/2] ARM: avoid tracers in soft

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Date:	Wed,  5 Mar 2014 02:50:04 -0800
From:	Sebastian Capella <sebastian.capella@...aro.org>
To:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linaro-kernel@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org
Cc:	Sebastian Capella <sebastian.capella@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Will Deacon <will.deacon@....com>,
	Robin Holt <robin.m.holt@...il.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Konstantin Khlebnikov <k.khlebnikov@...sung.com>,
	Steven Capper <steve.capper@...aro.org>,
	Stephen Warren <swarren@...dia.com>, Tejun Heo <tj@...nel.org>
Subject: [PATCH v7 1/2] ARM: avoid tracers in soft_restart

Use of tracers in local_irq_disable is causes recursive aborts when
called with irqs disabled and using a temporary stack (hibernation).
Replace local_irq_disable with raw_local_irq_disable instead to
avoid tracers.

Signed-off-by: Sebastian Capella <sebastian.capella@...aro.org>
Cc: Russell King <linux@....linux.org.uk>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Will Deacon <will.deacon@....com>
Cc: Robin Holt <robin.m.holt@...il.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Konstantin Khlebnikov <k.khlebnikov@...sung.com>
Cc: Steven Capper <steve.capper@...aro.org>
Cc: Stephen Warren <swarren@...dia.com>
Cc: Tejun Heo <tj@...nel.org>
---
 arch/arm/kernel/process.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 92f7b15..f58b723 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -100,7 +100,7 @@ void soft_restart(unsigned long addr)
 	u64 *stack = soft_restart_stack + ARRAY_SIZE(soft_restart_stack);
 
 	/* Disable interrupts first */
-	local_irq_disable();
+	raw_local_irq_disable();
 	local_fiq_disable();
 
 	/* Disable the L2 if we're the last man standing. */
-- 
1.7.9.5

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