From 5124d403e0389e577e04dea7adbccb1cde7e3219 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>

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();
 }
-- 
1.7.1.1