From: Zachary Amsden <zach@vmware.com>

We don't want to read PTEs directly like this after they have been modified,
as a lazy MMU implementation of direct page tables may not have written the
updated PTE back to memory yet.

Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 mm/memory.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/memory.c~paravirt-remove-read-hazard-from-cow mm/memory.c
--- a/mm/memory.c~paravirt-remove-read-hazard-from-cow
+++ a/mm/memory.c
@@ -467,7 +467,7 @@ copy_one_pte(struct mm_struct *dst_mm, s
 	 */
 	if (is_cow_mapping(vm_flags)) {
 		ptep_set_wrprotect(src_mm, addr, src_pte);
-		pte = *src_pte;
+		pte = pte_wrprotect(pte);
 	}
 
 	/*
_