x86/retbleed: Add fine grained Kconfig knobs

[sfrench/cifs-2.6.git] / arch / x86 / Makefile

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 6e16057737e52883dd29212199383cf2320ed2d3..1f40dad30d5084f50aaec155db49df961681cdd8 100644 (file)
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -15,14 +15,18 @@ endif
 ifdef CONFIG_CC_IS_GCC
 RETPOLINE_CFLAGS       := $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register)
 RETPOLINE_CFLAGS       += $(call cc-option,-mindirect-branch-cs-prefix)
-RETPOLINE_CFLAGS       += $(call cc-option,-mfunction-return=thunk-extern)
 RETPOLINE_VDSO_CFLAGS  := $(call cc-option,-mindirect-branch=thunk-inline -mindirect-branch-register)
 endif
 ifdef CONFIG_CC_IS_CLANG
 RETPOLINE_CFLAGS       := -mretpoline-external-thunk
 RETPOLINE_VDSO_CFLAGS  := -mretpoline
-RETPOLINE_CFLAGS       += $(call cc-option,-mfunction-return=thunk-extern)
 endif
+
+ifdef CONFIG_RETHUNK
+RETHUNK_CFLAGS         := -mfunction-return=thunk-extern
+RETPOLINE_CFLAGS       += $(RETHUNK_CFLAGS)
+endif
+
 export RETPOLINE_CFLAGS
 export RETPOLINE_VDSO_CFLAGS