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: <20250912125722.0000373e@huawei.com>
Date: Fri, 12 Sep 2025 12:57:22 +0100
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: James Morse <james.morse@....com>
CC: <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
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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

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>