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-rw-r--r--arch/powerpc/include/asm/pgtable.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 11a38635d..0717693c8 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -169,6 +169,17 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
* cases, and 32-bit non-hash with 32-bit PTEs.
*/
*ptep = pte;
+
+#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.
+ */
+ if (is_kernel_addr(addr))
+ mb();
+#endif
#endif
}