linux-kernel - Re: [PATCH v2 16/29] arm_mpam: Add a helper to touch an MSC from any CPU

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Message-ID: <7ac224c2-9014-4701-8d96-6df0a4bcc5f6@arm.com>
Date: Wed, 1 Oct 2025 10:50:49 +0100
From: James Morse <james.morse@....com>
To: Jonathan Cameron <jonathan.cameron@...wei.com>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-acpi@...r.kernel.org,
 D Scott Phillips OS <scott@...amperecomputing.com>,
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 Danilo Krummrich <dakr@...nel.org>, Ben Horgan <ben.horgan@....com>
Subject: Re: [PATCH v2 16/29] arm_mpam: Add a helper to touch an MSC from any
 CPU

Hi Jonathan,

On 12/09/2025 12:57, Jonathan Cameron wrote:
> On Wed, 10 Sep 2025 20:42:56 +0000
> James Morse <james.morse@....com> wrote:
> 
>> Resetting RIS entries from the cpuhp callback is easy as the
>> callback occurs on the correct CPU. This won't be true for any other
>> caller that wants to reset or configure an MSC.
>>
>> Add a helper that schedules the provided function if necessary.
>>
>> Callers should take the cpuhp lock to prevent the cpuhp callbacks from
>> changing the MSC state.
>>
>> Signed-off-by: James Morse <james.morse@....com>
>> Reviewed-by: Ben Horgan <ben.horgan@....com>

> Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>


Thanks!

James