linux-kernel - Re: [PATCH v11 3/4] arm64: topology: Support SMT control on ACPI based system

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Message-ID: <c8719fca-21a4-438e-8b9d-cd0418f135aa@arm.com>
Date: Fri, 28 Feb 2025 12:11:31 +0100
From: Dietmar Eggemann <dietmar.eggemann@....com>
To: Yicong Yang <yangyicong@...wei.com>, catalin.marinas@....com,
 will@...nel.org, sudeep.holla@....com, tglx@...utronix.de,
 peterz@...radead.org, mpe@...erman.id.au,
 linux-arm-kernel@...ts.infradead.org, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, pierre.gondois@....com
Cc: linuxppc-dev@...ts.ozlabs.org, x86@...nel.org,
 linux-kernel@...r.kernel.org, morten.rasmussen@....com, msuchanek@...e.de,
 gregkh@...uxfoundation.org, rafael@...nel.org, jonathan.cameron@...wei.com,
 prime.zeng@...ilicon.com, linuxarm@...wei.com, yangyicong@...ilicon.com,
 xuwei5@...wei.com, guohanjun@...wei.com, sshegde@...ux.ibm.com
Subject: Re: [PATCH v11 3/4] arm64: topology: Support SMT control on ACPI
 based system

On 18/02/2025 15:10, Yicong Yang wrote:
> From: Yicong Yang <yangyicong@...ilicon.com>

[...]

> @@ -67,6 +108,31 @@ int __init parse_acpi_topology(void)
>  		cpu_topology[cpu].package_id = topology_id;
>  	}
>  
> +	/*
> +	 * This should be a short loop depending on the number of heterogeneous
                ^^^^^^

This _is_ a short loop since the number of xArray elements is the number
of heterogeneous CPU clusters.

> +	 * CPU clusters. Typically on a homogeneous system there's only one
                         ^^^^^^^^^

I would remove 'Typically' here.

[...]