[PATCH v4 11/13] x86/retpoline: Simplify AMD variant of retpoline thunk

[David Woodhouse]

On AMD (which is X86_FEATURE_K8), just the lfence is sufficient.

Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
---
 arch/x86/lib/retpoline.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S
index 958d56f..d58f8f3 100644
--- a/arch/x86/lib/retpoline.S
+++ b/arch/x86/lib/retpoline.S
@@ -12,7 +12,7 @@
 
 ENTRY(__x86.indirect_thunk.\reg)
 	CFI_STARTPROC
-	ALTERNATIVE "call 2f", __stringify(jmp *%\reg), X86_BUG_NO_RETPOLINE
+	ALTERNATIVE_2 "call 2f", __stringify(lfence;jmp *%\reg), X86_FEATURE_K8, __stringify(jmp *%\reg), X86_BUG_NO_RETPOLINE
 1:
 	lfence
 	jmp	1b
-- 
2.7.4