Comment 17 for bug 1830961

If I make the same changes to the Makefile as per the link in comment #16, then the kernel compiles fine and without the zillions of warnings I mentioned in comment #13. However I can not find this anywhere "upstream" as the notes seem to indicate.

doug@serv-ee:~/temp-k-git/linux$ git diff
diff --git a/Makefile b/Makefile
index 3e4868a6498b..d8ccc47215be 100644
--- a/Makefile
+++ b/Makefile
@@ -630,8 +630,8 @@ ifdef CONFIG_FUNCTION_TRACER
   CC_FLAGS_FTRACE := -pg
 endif

-RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
-RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
+RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register -fcf-protection=none
+RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register -fcf-protection=none
 RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
 RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
 RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))