linux-kernel - RE: [PATCH 01/33] ACPI / PPTT: Add a helper to fill a cpumask from a processor container

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Date: Wed, 12 Nov 2025 05:45:32 +0000
From: "Shaopeng Tan (Fujitsu)" <tan.shaopeng@...itsu.com>
To: 'Ben Horgan' <ben.horgan@....com>, "james.morse@....com"
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Subject: RE: [PATCH 01/33] ACPI / PPTT: Add a helper to fill a cpumask from a
 processor container

> From: James Morse <james.morse@....com>
> 
> The ACPI MPAM table uses the UID of a processor container specified in the
> PPTT to indicate the subset of CPUs and cache topology that can access each
> MPAM System Component (MSC).
> 
> This information is not directly useful to the kernel. The equivalent cpumask is
> needed instead.
> 
> Add a helper to find the processor container by its id, then walk the possible
> CPUs to fill a cpumask with the CPUs that have this processor container as a
> parent.
> 
> CC: Dave Martin <dave.martin@....com>
> Reviewed-by: Sudeep Holla <sudeep.holla@....com>
> Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>
> Reviewed-by: Fenghua Yu <fenghuay@...dia.com>
> Reviewed-by: Gavin Shan <gshan@...hat.com>
> Tested-by: Fenghua Yu <fenghuay@...dia.com>
> Tested-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
> Tested-by: Peter Newman <peternewman@...gle.com>
> Signed-off-by: James Morse <james.morse@....com>
> Signed-off-by: Ben Horgan <ben.horgan@....com>

Reviewed-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>