Linux mainline: sched_ext hotplug hang, cpuset races, and ATAPI fixes

A round of fixes for sched_ext, cpuset, workqueue, and libata, including CPU hotplug and workqueue NULL-pointer issues.

#CPUHotplug #Cpuset #Libata #SchedExt #Workqueue

https://kerneldispatch.com/posts/mainline-2026-10-07