Re: [PATCH v3 3/8] sched/deadline: Generalize unique visiting of root domains

[Valentin Schneider]

On 10/03/25 10:35, Juri Lelli wrote:
> Bandwidth checks and updates that work on root domains currently employ
> a cookie mechanism for efficiency. This mechanism is very much tied to
> when root domains are first created and initialized.
>
> Generalize the cookie mechanism so that it can be used also later at
> runtime while updating root domains. Also, additionally guard it with
> sched_domains_mutex, since domains need to be stable while updating them
> (and it will be required for further dynamic changes).
>
> Reported-by: Jon Hunter <jonathanh@xxxxxxxxxx>
> Fixes: 53916d5fd3c0 ("sched/deadline: Check bandwidth overflow earlier for hotplug")
> Tested-by: Waiman Long <longman@xxxxxxxxxx>
> Tested-by: Jon Hunter <jonathanh@xxxxxxxxxx>
> Signed-off-by: Juri Lelli <juri.lelli@xxxxxxxxxx>

Reviewed-by: Valentin Schneider <vschneid@xxxxxxxxxx>