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

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Message-ID: <97abdb69-9ef5-a0f8-5055-3e9295024c42@roeck-us.net>
Date:   Tue, 13 Feb 2018 18:18:30 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     David Woodhouse <dwmw2@...radead.org>
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 02/13/2018 04:10 PM, David Woodhouse wrote:
> 
> 
> 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.
> 
Excellent, thanks a lot! That the retpoline.S changes for clang are
no longer required is excellent news.

> 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?
> 
For my part I completely forgot about it :-(. Did you expect me to file a bug ?
If so, I'll need to retest and try to figure out how to do that. Let me know;
I should be able to get that done tomorrow.

Thanks,
Guenter