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This is an early-stage partial implementation that demonstrates the core building blocks for nested sub-scheduler dispatching. While significant work remains in the enqueue path and other areas, this patch establishes the fundamental mechanisms needed for hierarchical scheduler operation. The key building blocks introduced include: - Private stack support for ops.dispatch() to prevent stack overflow when walking down nested schedulers during dispatch operations - scx_bpf_sub_dispatch() kfunc that allows parent schedulers to trigger dispatch operations on their direct child schedulers - Proper parent-child relationship validation to ensure dispatch requests are only made to legitimate child schedulers - Updated scx_dispatch_sched() to handle both nested and non-nested invocations with appropriate kf_mask handling The qmap scheduler is updated to demonstrate the functionality by calling scx_bpf_sub_dispatch() on registered child schedulers when it has no tasks in its own queues. Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Andrea Righi <arighi@nvidia.com>