linux-kernel - Re: [PATCH 4/6] x86/cpu: Add platform ID to CPU info structure

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Message-ID: <20260208213735.GCaYkCHz1cxp-Ivm7L@fat_crate.local>
Date: Sun, 8 Feb 2026 22:37:35 +0100
From: Borislav Petkov <bp@...en8.de>
To: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org, sohil.mehta@...el.com,
	zhao1.liu@...el.com, "H. Peter Anvin" <hpa@...or.com>,
	Ingo Molnar <mingo@...hat.com>, Jon Kohler <jon@...anix.com>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Thomas Gleixner <tglx@...nel.org>, Tony Luck <tony.luck@...el.com>,
	x86@...nel.org
Subject: Re: [PATCH 4/6] x86/cpu: Add platform ID to CPU info structure

On Fri, Feb 06, 2026 at 03:14:45PM -0800, Dave Hansen wrote:
> diff -puN arch/x86/include/asm/processor.h~cpu-x86_stepping arch/x86/include/asm/processor.h
> --- a/arch/x86/include/asm/processor.h~cpu-x86_stepping	2026-02-06 15:14:23.528790212 -0800
> +++ b/arch/x86/include/asm/processor.h	2026-02-06 15:14:23.567791582 -0800
> @@ -140,6 +140,8 @@ struct cpuinfo_x86 {
>  		__u32		x86_vfm;
>  	};
>  	__u8			x86_stepping;
> +	/* Intel-only. 3 bits: */
> +	__u8			x86_platform_id;

Can we call this something more generic so that we can do:

	/* On Intel: platform ID
	/* On AMD: something else

so that we can use this on both vendors?

I don't have any usage in mind on AMD now but it might come in handy some day.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette