| 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 |
| |
