Noble update: v6.8.4 upstream stable release

    SRU Justification

    Impact:
       The upstream process for stable tree updates is quite similar
       in scope to the Ubuntu SRU process, e.g., each patch has to
       demonstrably fix a bug, and each patch is vetted by upstream
       by originating either directly from a mainline/stable Linux tree or
       a minimally backported form of that patch. The following upstream
       stable patches should be included in the Ubuntu kernel:

       v6.8.4 upstream stable release
       from git://git.kernel.org/

Linux 6.8.4
Revert "workqueue.c: Increase workqueue name length"
Revert "workqueue: Move pwq->max_active to wq->max_active"
Revert "workqueue: Factor out pwq_is_empty()"
Revert "workqueue: Replace pwq_activate_inactive_work() with [__]pwq_activate_work()"
Revert "workqueue: Move nr_active handling into helpers"
Revert "workqueue: Make wq_adjust_max_active() round-robin pwqs while activating"
Revert "workqueue: RCU protect wq->dfl_pwq and implement accessors for it"
Revert "workqueue: Introduce struct wq_node_nr_active"
Revert "workqueue: Implement system-wide nr_active enforcement for unbound workqueues"
Revert "workqueue: Don't call cpumask_test_cpu() with -1 CPU in wq_update_node_max_active()"
Revert "workqueue: Shorten events_freezable_power_efficient name"