RE: [PATCH 19/33] arm_mpam: Add a helper to touch an MSC from any CPU

Shaopeng Tan (Fujitsu)
2025-11-14T02:47:18Z

> From: James Morse <james.morse@arm.com>
>
> 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@arm.com>
> Reviewed-by: Ben Horgan <ben.horgan@arm.com>
> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
> Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
> Tested-by: Fenghua Yu <fenghuay@nvidia.com>
> Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
> Tested-by: Peter Newman <peternewman@google.com>
> Signed-off-by: Ben Horgan <ben.horgan@arm.com>

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