From 5caecb9432428241d0c641897f07ff4003f1b55f Mon Sep 17 00:00:00 2001
From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Date: Fri, 20 Feb 2009 23:01:26 -0800
Subject: [PATCH] xen: disable preempt for leave_lazy_mmu

xen_mc_flush() requires preemption to be disabled for its own sanity,
so disable it while we're flushing.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
 arch/x86/xen/mmu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 3f2d0fe5e6a8..0e572380413b 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1812,8 +1812,10 @@ __init void xen_post_allocator_init(void)
 
 static void xen_leave_lazy_mmu(void)
 {
+	preempt_disable();
 	xen_mc_flush();
 	paravirt_leave_lazy_mmu();
+	preempt_enable();
 }
 
 const struct pv_mmu_ops xen_mmu_ops __initdata = {
-- 
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