linux-kernel - Re: [PATCH v2 19/29] arm_mpam: Use a static key to indicate when mpam is enabled

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Message-ID: <20250912131336.000014d3@huawei.com>
Date: Fri, 12 Sep 2025 13:13:36 +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>
Subject: Re: [PATCH v2 19/29] arm_mpam: Use a static key to indicate when
 mpam is enabled

On Wed, 10 Sep 2025 20:42:59 +0000
James Morse <james.morse@....com> wrote:

> Once all the MSC have been probed, the system wide usable number of
> PARTID is known and the configuration arrays can be allocated.
> 
> After this point, checking all the MSC have been probed is pointless,
> and the cpuhp callbacks should restore the configuration, instead of
> just resetting the MSC.
> 
> Add a static key to enable this behaviour. This will also allow MPAM
> to be disabled in repsonse to an error, and the architecture code to
> enable/disable the context switch of the MPAM system registers.
> 
> Signed-off-by: James Morse <james.morse@....com>

Seems fine to me (other than the TODO move to arch code
that should probably be resolved.

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