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From b7975b9770953bd7c6d41a819c6d599410341de0 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 3 Jul 2009 08:44:52 -0500
Subject: [PATCH] powerpc: Disable preemption across hypervisor call
commit 2126c312a6267cbf1f85f604dbc781af252279b3 in tip.
Otherwise the HV magic gets confused if we are preempted.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
arch/powerpc/lib/locks.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/lib/locks.c b/arch/powerpc/lib/locks.c
index 58e14fb..55c7908 100644
--- a/arch/powerpc/lib/locks.c
+++ b/arch/powerpc/lib/locks.c
@@ -86,8 +86,10 @@ void arch_spin_unlock_wait(arch_spinlock_t *lock)
{
while (lock->slock) {
HMT_low();
+ preempt_disable();
if (SHARED_PROCESSOR)
__spin_yield(lock);
+ preempt_enable();
}
HMT_medium();
}
--
1.7.0.4
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