linux-kernel - clang asm-goto support (Was Re: [PATCH v2] x86/retpoline: Add clang support)

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Message-ID: <CAGXu5j+7=61aY_Q4Zd4kRgovb07MYg9uej8B2KmdvZE3zPsbRw@mail.gmail.com>
Date:   Tue, 13 Feb 2018 16:28:56 -0800
From:   Kees Cook <keescook@...gle.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Chandler Carruth <chandlerc@...gle.com>,
        Marina Yatsina <marina.yatsina@...el.com>
Cc:     Guenter Roeck <linux@...ck-us.net>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Rik van Riel <riel@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jiri Kosina <jikos@...nel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Dave Hansen <dave.hansen@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Paul Turner <pjt@...gle.com>,
        Stephen Hines <srhines@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: clang asm-goto support (Was Re: [PATCH v2] x86/retpoline: Add clang support)

On Tue, Feb 13, 2018 at 4:10 PM, David Woodhouse <dwmw2@...radead.org> wrote:
> We also need to resolve the asm-goto thing.

Yes, this is becoming much more urgent, assuming we'll be raising the
minimum GCC version soon and drop support for lacking asm-goto...

Do you happen to know who the right people are to include to move the
discussion forward? I know various kernel folks that are passionate
about it, but I'm still getting to know who to talk with from llvm.

I see an earlier thread here:
http://lists.llvm.org/pipermail/llvm-dev/2017-April/111748.html

It seems to end there? I'm still coming up to speed on it, so I'm
likely missing other context.

-Kees

-- 
Kees Cook
Pixel Security