[PATCH 4.14 032/107] powerpc/64: Make stf barrier PPC_BOOK3S_64 specific.

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Diana Craciun <diana.craciun@xxxxxxx>

commit 6453b532f2c8856a80381e6b9a1f5ea2f12294df upstream.

NXP Book3E platforms are not vulnerable to speculative store
bypass, so make the mitigations PPC_BOOK3S_64 specific.

Signed-off-by: Diana Craciun <diana.craciun@xxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/powerpc/kernel/security.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -176,6 +176,7 @@ ssize_t cpu_show_spectre_v2(struct devic
 	return s.len;
 }
 
+#ifdef CONFIG_PPC_BOOK3S_64
 /*
  * Store-forwarding barrier support.
  */
@@ -323,3 +324,4 @@ static __init int stf_barrier_debugfs_in
 }
 device_initcall(stf_barrier_debugfs_init);
 #endif /* CONFIG_DEBUG_FS */
+#endif /* CONFIG_PPC_BOOK3S_64 */