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

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Date:   Fri, 16 Feb 2018 10:08:20 -0500
From:   tedheadster <tedheadster@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
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

Andy

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

>> Using a configuration with either M586TSC or M586MMX currently sets
>> X86_MINIMUM_CPU_FAMILY=4 instead of the correct value 5.
>
> Are you sure about this? See above.
>

Yes I am sure of this, I tested it very well. A similar problem
happens with an M686 configuration for a different reason.

- Matthew