On Thu, Feb 01, 2018 at 04:32:35PM +0100, Peter Zijlstra wrote: > On Thu, Feb 01, 2018 at 09:28:56AM -0600, Josh Poimboeuf wrote: > > On Thu, Feb 01, 2018 at 03:34:21PM +0100, Peter Zijlstra wrote: > > > There are the retpoline validation patches; they work with the > > > __noretpoline > > > thing from David. > > > > Have you run this through 0-day bot yet? > > Yes, it complains a _lot_ because no retpoline supported compiler.
I think I finally got something that works there... Damn I hate makefiles.. --- a/Makefile +++ b/Makefile @@ -486,6 +486,11 @@ KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC) endif +ifneq ($(call cc-option,-mindirect-branch=thunk-extern -mindirect-branch-register),) + CC_HAS_RETPOLINE := 1 +endif +export CC_HAS_RETPOLINE + ifeq ($(config-targets),1) # =========================================================================== # *config targets only - make sure prerequisites are updated, and descend --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -267,8 +267,10 @@ else objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable) endif ifdef CONFIG_RETPOLINE +ifdef CC_HAS_RETPOLINE objtool_args += --retpoline endif +endif ifdef CONFIG_MODVERSIONS
