Revert "workqueue: Backport from upstream"

This reverts commit 7c74a217793005ae57fd9604e73063700b95d44b.
Revert "rcu: Use smp_hotplug_thread facility for RCUs per-CPU kthread"

This reverts commit 983a488c020229d52bb6814595c4d7611d5d1ee4.
Revert "rcu: Yield simpler"

This reverts commit cc760fc1bce5ad36563644f76243689298704695.
Revert "softirq: Use hotplug thread infrastructure"

This reverts commit f0ed942e009ddd87a1a0ec0098001d0b05662017.
Revert "[backport] Hotplug thread infrastructure"

This reverts commit 5b5b835375fd7cf8987ad015092edeefa05481e6.
Revert "mako_hotplug: add my latest Hotplug driver code squash."

This reverts commit ca92c1c7513350e3cb824bc41c6c39d9cb187e35.