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Date:   Wed, 14 Feb 2018 10:08:51 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     "Yatsina, Marina" <marina.yatsina@intel.com>
Cc:     Kees Cook <keescook@google.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Chandler Carruth <chandlerc@google.com>,
        "Kreitzer, David L" <david.l.kreitzer@intel.com>,
        "Grischenko, Andrei L" <andrei.l.grischenko@intel.com>,
        "rnk@google.com" <rnk@google.com>,
        LLVM Developers <llvm-dev@lists.llvm.org>,
        "ehsan@mozilla.com" <ehsan@mozilla.com>,
        "Tayree, Coby" <coby.tayree@intel.com>,
        Matthias Braun <matze@braunis.de>,
        Dean Michael Berris <dean.berris@gmail.com>,
        James Y Knight <jyknight@google.com>,
        Guenter Roeck <linux@roeck-us.net>, X86 ML <x86@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Alan Cox <gnomes@lxorguk.ukuu.org.uk>,
        Rik van Riel <riel@redhat.com>,
        Andi Kleen <ak@linux.intel.com>,
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        Tom Lendacky <thomas.lendacky@amd.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Jiri Kosina <jikos@kernel.org>,
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        "Hansen, Dave" <dave.hansen@intel.com>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Greg Kroah-Hartman <gregkh@linux-foundation.org>,
        Paul Turner <pjt@google.com>,
        Stephen Hines <srhines@google.com>,
        Nick Desaulniers <ndesaulniers@google.com>
Subject: Re: clang asm-goto support (Was Re: [PATCH v2] x86/retpoline: Add
 clang support)
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On Wed, Feb 14, 2018 at 08:33:39AM +0000, Yatsina, Marina wrote:
> I hope this will give this issue a push forward and we will find a
> solution that will not prevent llvm from compiling linux kernel.

That solution is asm-goto. We (linux kernel) are not going to support
something like it. It's going to be asm-goto or bust. The feature is
over 7 years old by now, deal with it.

If you ever get to the point where it makes sense to build a kernel with
LLVM, then you can bike-shed with the GCC team on new features, until
then tough luck.