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

Nathan Chancellor
2019-06-26T20:03:13Z

On Wed, Jun 26, 2019 at 09:46:02PM +0200, Thomas Gleixner wrote:
> 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@linutronix.de>

Fantastic, thank you!

https://github.com/ClangBuiltLinux/tc-build/pull/19

Should be merged soon hopefully.

Cheers,
Nathan