linux-kernel - Re: [PATCH] MAINTAINERS, x86/CPU: Tony Luck will maintain asm/intel-family.h

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Date:   Thu, 15 Aug 2019 20:35:15 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MAINTAINERS, x86/CPU: Tony Luck will maintain
 asm/intel-family.h

On Thu, Aug 15, 2019 at 11:30:55AM -0700, Luck, Tony wrote:
> On Thu, Aug 15, 2019 at 07:54:55PM +0200, Borislav Petkov wrote:
> > On Thu, Aug 15, 2019 at 10:21:59AM -0700, Luck, Tony wrote:
> > > Like this?
> > 
> > Actually, I was thinking you'd put it above the defines in the file
> > intel-family.h itself so that *everyone* who wants to add a model, sees
> > it first and while that explanation below is very nice...
> 
> V2 ... ugh ... C doesn't do well with nested comments, so the example
> has issues.  I chose to use a C++ style comment (as they are not as
> verboten in Linux as they used to be).
> 
> Another option would be to put the instructions inside #if 0 ... #endif
> but that seems less than ideal.
> 
> Any other ideas?
> 
> -Tony
> 
> From 84624a3410a3ba03c3acb13e54b1292c3ca64b8c Mon Sep 17 00:00:00 2001
> From: Tony Luck <tony.luck@...el.com>
> Date: Thu, 15 Aug 2019 11:16:24 -0700
> Subject: [PATCH] x86/cpu: Explain Intel model naming convention
> 
> Dave Hansen spelled out the rules in an e-mail:
> 
>  https://lkml.kernel.org/r/91eefbe4-e32b-d762-be4d-672ff915db47@intel.com
> 
> Copy those right into the <asm/intel-family.h> file to
> make it easy for people to find them.
> 
> Suggested-by: Borislav Petkov <bp@...en8.de>
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> ---
>  arch/x86/include/asm/intel-family.h | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/arch/x86/include/asm/intel-family.h b/arch/x86/include/asm/intel-family.h
> index 0278aa66ef62..87443df77eee 100644
> --- a/arch/x86/include/asm/intel-family.h
> +++ b/arch/x86/include/asm/intel-family.h
> @@ -11,6 +11,21 @@
>   * While adding a new CPUID for a new microarchitecture, add a new
>   * group to keep logically sorted out in chronological order. Within
>   * that group keep the CPUID for the variants sorted by model number.
> + *
> + * HOWTO Build an INTEL_FAM6_ definition:
> + * 
> + * 1. Start with INTEL_FAM6_
> + * 2. If not Core-family, add a note about it, like "ATOM".  There are only
> + *    two options for this (Xeon Phi and Atom).  It is exceedingly unlikely
> + *    that you are adding a cpu which needs a new option here.
> + * 3. Add the processor microarchitecture, not the platform name
> + * 4. Add a short differentiator if necessary.  Add an _X to differentiate
> + *    Server from Client.
> + * 5. Add an optional comment with the platform name(s)
> + * 
> + * It should end up looking like this:
> + * 
> + * INTEL_FAM6_<ATOM?>_<MICROARCH>_<SHORT...> // Platform Name(s)
>   */
>  
>  #define INTEL_FAM6_CORE_YONAH		0x0E
> -- 

Thanks, LGTM. Let's wait for the others to bikeshed a little before I
take it.

:-)

-- 
Regards/Gruss,
    Boris.

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