linux-kernel - Re: [PATCH 1/3] x86/Kconfig : Add missing i586-class cpus to X86

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Message-ID: <CAHp75VefOvDZGXNPediXvHDL79u2hH=hPAaD1b9sr7fux0vR3Q@mail.gmail.com>
Date:   Fri, 16 Feb 2018 18:32:44 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     whiteheadm@....org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] x86/Kconfig : Add missing i586-class cpus to
 X86_CMPXCHG64 Kconfig group

On Fri, Feb 16, 2018 at 5:08 PM, tedheadster <tedheadster@...il.com> wrote:
> On Fri, Feb 16, 2018 at 9:17 AM, Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
>> On Thu, Feb 15, 2018 at 6:54 PM, Matthew Whitehead
>> <tedheadster@...il.com> wrote:
>>> Several i586-class cpus supporting this instruction are missing from
>>> the X86_CMPXCHG64 config group.
>>
>> What about Intel Quark? MinuteIA core which is currently set as M586TSC.

> I am unsure what you are asking here. I do not see any option for
> Intel Quark processor types in arch/x86/Kconfig.cpu. Are you saying
> there should be one?

> Or perhaps you are saying that Intel Quark is currently set for
> M586TSC and it lacks the CMPXCHG64 instruction?

This is a good question.
The CPUID tells us family 5, model 9.

> If so, I would change
> my config option from M586TSC to M586.


-- 
With Best Regards,
Andy Shevchenko