linux-kernel - Re: [PATCH v2] x86/retpoline: Add clang support

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Date:   Wed, 14 Feb 2018 00:10:57 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        gnomes@...rguk.ukuu.org.uk, Rik van Riel <riel@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>, thomas.lendacky@....com,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jiri Kosina <jikos@...nel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Dave Hansen <dave.hansen@...el.com>,
        Kees Cook <keescook@...gle.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH v2] x86/retpoline: Add clang support



On Tue, 2018-02-13 at 15:41 -0800, Guenter Roeck wrote:
> Hi David,
> 
> On Wed, Feb 07, 2018 at 03:32:11PM -0800, Guenter Roeck wrote:
> [ ... ]
> > > 
> > > See
> > > http://git.infradead.org/users/dwmw2/linux-retpoline.git/commitdiff/82a1f41600
> 
> Any chance to see a patch with this change anytime soon ?

We were waiting for a fix for
https://bugs.llvm.org/show_bug.cgi?id=36329

I tested the candidate fix tonight and reported success; the
corresponding patch is at the top of my tree. Since I think we now have
a consensus on what the clang build will look like, I'll post that in
the morning along with the other bits I have ready to send upstream.

We're going to need the percpu.h fix too, and I'd also like to see the
status of the i915 build failure you mentioned. Is there a bug filed
for that already, and is it on the blocker list for 6.0? If not, why
not?

We also need to resolve the asm-goto thing.


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