CVE-2025-68333

In the Linux kernel, the following vulnerability has been resolved:

schedext: Fix possible deadlock in the deferredirq_workfn()

For PREEMPTRT=y kernels, the deferredirqworkfn() is executed in the per-cpu irqwork/* task context and not disable-irq, if the rq returned by container_of() is current CPU's rq, the following scenarios may occur:

lock(&rq->__lock); <Interrupt> lock(&rq->__lock);

This commit use IRQWORKINITHARD() to replace initirqwork() to initialize rq->scx.deferredirqwork, make the deferredirq_workfn() is always invoked in hard-irq context.