From f120f13ea0dbb0b0d6675683d5f6faea71277e65 Mon Sep 17 00:00:00 2001
From: Jeremy Fitzhardinge <jeremy@xensource.com>
Date: Tue, 17 Jul 2007 18:37:06 -0700
Subject: xen: Add support for preemption

Add Xen support for preemption.  This is mostly a cleanup of existing
preempt_enable/disable calls, or just comments to explain the current
usage.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
 arch/i386/xen/mmu.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'arch/i386/xen/mmu.c')

diff --git a/arch/i386/xen/mmu.c b/arch/i386/xen/mmu.c
index bc49ef846203..f431cf14e644 100644
--- a/arch/i386/xen/mmu.c
+++ b/arch/i386/xen/mmu.c
@@ -38,6 +38,7 @@
  *
  * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
  */
+#include <linux/sched.h>
 #include <linux/highmem.h>
 #include <linux/bug.h>
 #include <linux/sched.h>
@@ -531,5 +532,7 @@ void xen_exit_mmap(struct mm_struct *mm)
 	drop_mm_ref(mm);
 	put_cpu();
 
+	spin_lock(&mm->page_table_lock);
 	xen_pgd_unpin(mm->pgd);
+	spin_unlock(&mm->page_table_lock);
 }
-- 
cgit v1.2.3