linux-kernel - Re: [PATCH] perf/x86/intel: Mark expected switch fall-throughs

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Message-ID: <201906251309.BBB7D17@keescook>
Date:   Tue, 25 Jun 2019 13:09:38 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Joe Perches <joe@...ches.com>, Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Shawn Landden <shawn@....icu>
Subject: Re: [PATCH] perf/x86/intel: Mark expected switch fall-throughs

On Tue, Jun 25, 2019 at 11:05:25AM -0700, Nathan Chancellor wrote:
> On Tue, Jun 25, 2019 at 10:12:42AM -0700, Kees Cook wrote:
> > On Tue, Jun 25, 2019 at 09:18:46AM +0200, Peter Zijlstra wrote:
> > > Can it build a kernel without patches yet? That is, why should I care
> > > what LLVM does?
> > 
> > Yes. LLVM trunk builds and boots x86 now. As for distro availability,
> > AIUI, the asm-goto feature missed the 9.0 LLVM branch point, so it'll
> > appear in the following release.
> > 
> > -- 
> > Kees Cook
> 
> I don't think that's right. LLVM 9 hasn't been branched yet so it should
> make it in.
> 
> http://lists.llvm.org/pipermail/llvm-dev/2019-June/133155.html
> 
> If anyone wants to play around with it before then, we wrote a
> self-contained script that will build an LLVM toolchain suitable for
> kernel development:
> 
> https://github.com/ClangBuiltLinux/tc-build

Ah! That's good news. :) I thought the branch happened just before
asm-goto landed. Wheee!

-- 
Kees Cook