linux-kernel - Re: [tip:x86/pti] objtool, retpolines: Integrate objtool with retpoline support more closely

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Date:   Wed, 21 Feb 2018 10:59:14 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     peterz@...radead.org, hpa@...or.com, luto@...nel.org,
        arjan@...ux.intel.com, tglx@...utronix.de,
        dan.j.williams@...el.com, torvalds@...ux-foundation.org,
        gregkh@...uxfoundation.org, mingo@...nel.org, bp@...en8.de,
        linux-kernel@...r.kernel.org, dave.hansen@...ux.intel.com,
        jpoimboe@...hat.com, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/pti] objtool, retpolines: Integrate objtool with
 retpoline support more closely

On Wed, 2018-02-21 at 02:34 -0800, tip-bot for Peter Zijlstra wrote:
> 
> --- a/Makefile
> +++ b/Makefile
> @@ -489,6 +489,11 @@ KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
>  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
> +

That isn't the same as the check in arch/x86/Makefile.

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