X-Git-Url: http://nv-tegra.nvidia.com/gitweb/?p=linux-2.6.git;a=blobdiff_plain;f=virt%2Fkvm%2Fkvm_main.c;h=9f32bffd37c0fcd9c95fd7887e9e62b5d1e294cc;hp=64be836f3348bebc959442c801371c2c2f64a42c;hb=a355aa54f1d25dff83c0feef8863d83a76988fdb;hpb=342d3db763f2621ed4546ebf8f6c61cb29d7fbdb

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 64be836..9f32bff 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -357,11 +357,11 @@ static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
 	 * been freed.
 	 */
 	kvm->mmu_notifier_seq++;
+	smp_wmb();
 	/*
 	 * The above sequence increase must be visible before the
-	 * below count decrease but both values are read by the kvm
-	 * page fault under mmu_lock spinlock so we don't need to add
-	 * a smb_wmb() here in between the two.
+	 * below count decrease, which is ensured by the smp_wmb above
+	 * in conjunction with the smp_rmb in mmu_notifier_retry().
 	 */
 	kvm->mmu_notifier_count--;
 	spin_unlock(&kvm->mmu_lock);