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

Kees Cook
2019-06-25T20:09:42Z

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