x86: Fix the build.

Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index c917cb7c6cdba84a13dc8f020fe531c158911075..acf26d40b3c6d2e5eae69facdd71c48e7a477821 100644 (file)
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -793,7 +793,8 @@ p2m_pod_zero_check_superpage(struct domain *d, unsigned long gfn)
      * being allocated to the domain. */
     for ( i=0; i < (1<<9); i++ )
     {
-        if ( (mfn_to_page(mfn0+i)->count_info & PGC_count_mask) > 1 )
+        mfn = _mfn(mfn_x(mfn0) + i);
+        if ( (mfn_to_page(mfn)->count_info & PGC_count_mask) > 1 )
         {
             reset = 1;
             goto out_reset;