The tricky p->scx.holding_cpu handling was split across
consume_remote_task() body and move_task_to_local_dsq(). Refactor such that:
- All the tricky part is now in the new unlink_dsq_and_lock_src_rq() with
consolidated documentation.
- move_task_to_local_dsq() now implements straightforward task migration
making it easier to use in other places.
- dispatch_to_local_dsq() is another user move_task_to_local_dsq(). The
usage is updated accordingly. This makes the local and remote cases more
symmetric.
No functional changes intended.
v2: s/task_rq/src_rq/ for consistency.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: David Vernet <void@manifault.com>
4d3ca89bdd