---
 mm/mmu_notifier.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

Index: linux-2.6/mm/mmu_notifier.c
===================================================================
--- linux-2.6.orig/mm/mmu_notifier.c	2008-01-30 11:21:57.000000000 -0800
+++ linux-2.6/mm/mmu_notifier.c	2008-01-30 11:24:59.000000000 -0800
@@ -9,8 +9,9 @@
  *  the COPYING file in the top-level directory.
  */
 
-#include <linux/mmu_notifier.h>
 #include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/mmu_notifier.h>
 
 void mmu_notifier_release(struct mm_struct *mm)
 {
@@ -18,6 +19,7 @@ void mmu_notifier_release(struct mm_stru
 	struct hlist_node *n, *t;
 
 	if (unlikely(!hlist_empty(&mm->mmu_notifier.head))) {
+		down_write(&mm->mmap_sem);
 		rcu_read_lock();
 		hlist_for_each_entry_safe_rcu(mn, n, t,
 					  &mm->mmu_notifier.head, hlist) {
@@ -26,6 +28,7 @@ void mmu_notifier_release(struct mm_stru
 				mn->ops->release(mn, mm);
 		}
 		rcu_read_unlock();
+		up_write(&mm->mmap_sem);
 		synchronize_rcu();
 	}
 }
@@ -80,6 +83,7 @@ void mmu_notifier_unregister(struct mmu_
 }
 EXPORT_SYMBOL_GPL(mmu_notifier_unregister);
 
+#ifdef CONFIG_64BIT
 static DEFINE_SPINLOCK(mmu_notifier_list_lock);
 HLIST_HEAD(mmu_rmap_notifier_list);
 
@@ -111,3 +115,5 @@ void mmu_rmap_export_page(struct page *p
 	SetPageExternalRmap(page);
 }
 EXPORT_SYMBOL(mmu_rmap_export_page);
+
+#endif