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

From: Thomas Gleixner <tglx@linutronix.de>
To: Nathan Chancellor <natechancellor@gmail.com>
Cc: Kees Cook <keescook@chromium.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
	"Gustavo A. R. Silva" <gustavo@embeddedor.com>,
	Joe Perches <joe@perches.com>, Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
	<x86@kernel.org>, Kan Liang <kan.liang@linux.intel.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Shawn Landden <shawn@git.icu>,
	clang-built-linux@googlegroups.com,
	Josh Poimboeuf <jpoimboe@redhat.com>
Subject: Re: [PATCH] perf/x86/intel: Mark expected switch fall-throughs
Date: Wed, 26 Jun 2019 17:18:37 +0200 (CEST)	[thread overview]
Message-ID: <alpine.DEB.2.21.1906261711540.32342@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20190626051035.GA114229@archlinux-epyc>

On Tue, 25 Jun 2019, Nathan Chancellor wrote:
> On Tue, Jun 25, 2019 at 11:47:06PM +0200, Thomas Gleixner wrote:
> > On Tue, 25 Jun 2019, Nathan Chancellor wrote:
> > > On Tue, Jun 25, 2019 at 09:53:09PM +0200, Thomas Gleixner wrote:
> > > > 
> > > > But can the script please check for a minimal clang version required to
> > > > build that thing.
> > > > 
> > > > The default clang-3.8 which is installed on Debian stretch explodes. The
> > > > 6.0 variant from backports works as advertised.
> > > > 
> > > 
> > > Hmmm interesting, I test a lot of different distros using Docker
> > > containers to make sure the script works universally and that includes
> > > Debian stretch, which is the stress tester because all of the packages
> > > are older. I install the following packages then run the following
> > > command and it works fine for me (just tested):
> > > 
> > > $ apt update && apt install -y --no-install-recommends ca-certificates \
> > > ccache clang cmake curl file gcc g++ git make ninja-build python3 \
> > > texinfo zlib1g-dev
> > > $ ./build-llvm.py
> > > 
> > > If you could give me a build log, I'd be happy to look into it and see
> > > what I can do.
> > 
> > I can produce one tomorrow.

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.

Thanks,

	tglx