Re: [PATCH 06/31] sched: Add sched_class->switching_to() and expose check_class_changing/changed()

[Peter Zijlstra]

On Tue, Nov 29, 2022 at 10:22:48PM -1000, Tejun Heo wrote:
> When a task switches to a new sched_class, the prev and new classes are
> notified through ->switched_from() and ->switched_to(), respectively, after
> the switching is done. However, a new sched_class needs to prepare the task
> state before it is enqueued on the new class for the first time.

How and why isn't sched_fork() sufficient?