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cded46d971
In preparation for hierarchical schedulers, change scx_bpf_dsq_insert() and scx_bpf_dsq_insert_vtime() to return bool instead of void. With sub-schedulers, there will be no reliable way to guarantee a task is still owned by the sub-scheduler at insertion time (e.g., the task may have been migrated to another scheduler). The bool return value will enable sub-schedulers to detect and gracefully handle insertion failures. For the root scheduler, insertion failures will continue to trigger scheduler abort via scx_error(), so existing code doesn't need to check the return value. Backward compatibility is maintained through compat wrappers. Also update scx_bpf_dsq_move() documentation to clarify that it can return false for sub-schedulers when @dsq_id points to a disallowed local DSQ. Reviewed-by: Changwoo Min <changwoo@igalia.com> Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com> Acked-by: Andrea Righi <arighi@nvidia.com> Signed-off-by: Tejun Heo <tj@kernel.org>