linux-kernel - [PATCH 01/24] xen: disable preempt for leave_lazy

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Date:	Fri, 13 Mar 2009 01:11:37 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 01/24] xen: disable preempt for leave_lazy_mmu

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

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@...rix.com>
---
 arch/x86/xen/mmu.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 185b547..eceff87 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 = {
-- 
1.6.0.6

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