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88234b075c
In preparation of multiple scheduler support, add p->scx.sched which points to the scx_sched instance that the task is scheduled by, which is currently always scx_root. Add scx_task_sched[_rcu]() accessors which return the associated scx_sched of the specified task and replace the raw scx_root dereferences with it where applicable. scx_task_on_sched() is also added to test whether a given task is on the specified sched. As scx_root is still the only scheduler, this shouldn't introduce user-visible behavior changes. Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Andrea Righi <arighi@nvidia.com>