1 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index 7f0e872ab83d..65b7b65e8708 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -152,6 +152,18 @@ int map_kernel_page(unsigned long ea, unsigned long pa, int flags)
 		}
 #endif /* !CONFIG_PPC_MMU_NOHASH */
 	}
+
+#ifdef CONFIG_PPC_BOOK3E_64
+	/*
+	 * With hardware tablewalk, a sync is needed to ensure that
+	 * subsequent accesses see the PTE we just wrote.  Unlike userspace
+	 * mappings, we can't tolerate spurious faults, so make sure
+	 * the new PTE will be seen the first time.
+	 */
+	mb();
+#else
+	smp_wmb();
+#endif
 	return 0;
 }