Tejun Heo bff3b5aec1
sched_ext: Move disable machinery into scx_sched ...
Because disable can be triggered from any place and the scheduler cannot be
trusted, disable path uses an irq_work to bounce and a kthread_work which is
executed on an RT helper kthread to perform disable. These must be per
scheduler instance to guarantee forward progress. Move them into scx_sched.
- If an scx_sched is accessible, its helper kthread is always valid making
the `helper` check in schedule_scx_disable_work() unnecessary. As the
function becomes trivial after the removal of the test, inline it.
- scx_create_rt_helper() has only one user - creation of the disable helper
kthread. Inline it into scx_alloc_and_add_sched().
Signed-off-by: Tejun Heo <tj@kernel.org >
Reviewed-by: Andrea Righi <arighi@nvidia.com >
Acked-by: Changwoo Min <changwoo@igalia.com >
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