X-Git-Url: http://git.osdn.net/view?a=blobdiff_plain;f=Makefile;h=0fc511aac61cc9d965c96e496505d1cbe909ed7f;hb=e7dbd4d5369df7d101d6fde5595229df7060939d;hp=08510230b42f335ae0b2fce4813aa4c3a3635e39;hpb=1dbfae0113f1423b42c304989a3cc8a7dd0ea53e;p=uclinux-h8%2Flinux.git

diff --git a/Makefile b/Makefile
index 08510230b42f..0fc511aac61c 100644
--- a/Makefile
+++ b/Makefile
@@ -688,17 +688,6 @@ ifdef CONFIG_FUNCTION_TRACER
   CC_FLAGS_FTRACE := -pg
 endif
 
-ifdef CONFIG_CC_IS_GCC
-RETPOLINE_CFLAGS	:= $(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register)
-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
-endif
-export RETPOLINE_CFLAGS
-export RETPOLINE_VDSO_CFLAGS
-
 include $(srctree)/arch/$(SRCARCH)/Makefile
 
 ifdef need-config
@@ -953,6 +942,11 @@ KBUILD_CFLAGS += -Wvla
 # disable pointer signed / unsigned warnings in gcc 4.0
 KBUILD_CFLAGS += -Wno-pointer-sign
 
+# In order to make sure new function cast mismatches are not introduced
+# in the kernel (to avoid tripping CFI checking), the kernel should be
+# globally built with -Wcast-function-type.
+KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
+
 # disable stringop warnings in gcc 8+
 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)