aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/mm/pgtable_64.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/mm/pgtable_64.c')
-rw-r--r--arch/powerpc/mm/pgtable_64.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index 7f0e872..65b7b65 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;
}

Privacy Policy