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

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Date:   Wed, 26 Jun 2019 21:46:02 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Nathan Chancellor <natechancellor@...il.com>
cc:     Kees Cook <keescook@...omium.org>,
        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>,
        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>,
        clang-built-linux@...glegroups.com,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH] perf/x86/intel: Mark expected switch fall-throughs

On Wed, 26 Jun 2019, Nathan Chancellor wrote:
> On Wed, Jun 26, 2019 at 05:18:37PM +0200, Thomas Gleixner wrote:
> > tarball with log and the preprocessed source and run scripts:
> > 
> >     https://tglx.de/~tglx/tc-crash.tar.bz2
> > 
> > The machine runs up to date debian stretch which has backports enabled and
> > I just used the install command from the github project page you linked
> > to. Getting started section.
> > 
> Great, thank you! It explodes during lowering, which is a backend issue
> so that's fun :/
> 
> My guess is that this is a problem with -march=native on that version of
> LLVM (since a newer one works). Could you try this patch that makes that
> opt-in and see if that fixes it?
> 
> https://github.com/nathanchance/tc-build/commit/9f1ae41cd4246f9e4d011542f094aa0df2c069b4

clang --version
clang version 3.8.1-24 (tags/RELEASE_381/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

./build-llvm.py
...
LLVM build duration: 0:03:14

Tested-by: Thomas Gleixner <tglx@...utronix.de>