xen: correct error for building p2m list on 32 bits

In xen_rebuild_p2m_list() for large areas of invalid or identity
mapped memory the pmd entries on 32 bit systems are initialized
wrong. Correct this error.

Suggested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index cab221d..ff4ebd8 100644 (file)
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -378,7 +378,7 @@ static void __init xen_rebuild_p2m_list(unsigned long *p2m)
                        p2m_missing_pte : p2m_identity_pte;
                for (i = 0; i < PMDS_PER_MID_PAGE; i++) {
                        pmdp = populate_extra_pmd(
-                               (unsigned long)(p2m + pfn + i * PTRS_PER_PTE));
+                               (unsigned long)(p2m + pfn) + i * PMD_SIZE);
                        set_pmd(pmdp, __pmd(__pa(ptep) | _KERNPG_TABLE));
                }
        }