linux-kernel - Re: [PATCH v2 1/9] x86/cpu/topology: Add CPU type to struct cpuinfo

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Message-ID: <20240709124524.GGZo0w5G2XXya77Vbm@fat_crate.local>
Date: Tue, 9 Jul 2024 14:45:24 +0200
From: Borislav Petkov <bp@...en8.de>
To: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	daniel.sneddon@...ux.intel.com, tony.luck@...el.com,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Brice Goglin <brice.goglin@...il.com>,
	Mario Limonciello <mario.limonciello@....com>,
	Perry Yuan <Perry.Yuan@....com>,
	Dapeng Mi <dapeng1.mi@...ux.intel.com>
Subject: Re: [PATCH v2 1/9] x86/cpu/topology: Add CPU type to struct
 cpuinfo_topology

On Mon, Jul 08, 2024 at 06:24:18PM -0700, Pawan Gupta wrote:
> The draft version had it in cpuinfo_x86, but it later got moved to
> cpuinfo_topology as it appears to be topology related. Below is from AMD
> documentation:
> 
>   E.4.24 Function 8000_0026—Extended CPU Topology

That's the name of the CPUID leaf.

>   CPUID Fn8000_0026 reports extended topology information for logical
>   processors, including asymmetric and heterogenous topology descriptions.
>   Individual logical processors may report different values in systems with
>   asynchronous and heterogeneous topologies.
>   https://www.amd.com/content/dam/amd/en/documents/processor-tech-docs/programmer-references/24594.pdf
> 
> I can move it back to cpuinfo_x86 if you feel strongly about it.

Nah, it just felt weird. Not a biggie and we can always move it if we deem so.

-- 
Regards/Gruss,
    Boris.

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