1 files changed, 4 insertions, 1 deletions

diff --git a/arch/powerpc/mm/hugepage-hash64.c b/arch/powerpc/mm/hugepage-hash64.c
index 826893fcb3a7..11f9a37ca2c6 100644
--- a/arch/powerpc/mm/hugepage-hash64.c
+++ b/arch/powerpc/mm/hugepage-hash64.c
@@ -172,8 +172,11 @@ repeat:
                 mark_hpte_slot_valid(hpte_slot_array, index, slot);
         }
         /*
-         * No need to use ldarx/stdcx here
+         * The hpte valid is stored in the pgtable whose address is in the
+         * second half of the PMD. Order this against clearing of the busy bit in
+         * huge pmd.
          */
+        smp_wmb();
         *pmdp = __pmd(new_pmd & ~_PAGE_BUSY);
         return 0;
 }