Merge tag 'sched_ext-for-7.1-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext

Pull sched_ext fixes from Tejun Heo:
 "The bulk of this is hardening of the new sub-scheduler infrastructure.

   - UAFs and lifecycle bugs on the sub-sched attach/detach paths:
     parent sub_kset freed under a racing child, list_del_rcu on an
     uninitialized list head, ops->priv stomped by concurrent
     attach/detach, and a UAF in the init-failure error path

   - Task state-machine reorg closing concurrent enable-vs-dead races: a
     task exiting during the unlocked init window could trip NULL ops
     derefs or skip exit_task() cleanup

   - A scx_link_sched() self-deadlock on scx_sched_lock

   - isolcpus: stop dereferencing the now-RCU-protected HK_TYPE_DOMAIN
     cpumask without RCU, and stop rejecting BPF schedulers when only
     cpuset isolated partitions are active

   - PREEMPT_RT: disable irq_work runs in hardirq context so dumps show
     the failing task rather than the irq_work kthread

   - Assorted !CONFIG_EXT_SUB_SCHED, randconfig, and selftest build
     fixes"

* tag 'sched_ext-for-7.1-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext:
  sched_ext: Use HK_TYPE_DOMAIN_BOOT to detect isolcpus= domain isolation
  sched_ext: Defer sub_kset base put to scx_sched_free_rcu_work
  sched_ext: INIT_LIST_HEAD() &sch->all in scx_alloc_and_add_sched()
  sched_ext: Drop NONE early return in scx_disable_and_exit_task()
  sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path
  sched_ext: Clear ops->priv on scx_alloc_and_add_sched() error paths
  sched_ext: Fix ops->priv clobber on concurrent attach/detach
  selftests/sched_ext: Fix build error in dequeue selftest
  sched_ext: Handle SCX_TASK_NONE in disable/switched_from paths
  sched_ext: Close sub-sched init race with post-init DEAD recheck
  sched_ext: Close root-enable vs sched_ext_dead() race with SCX_TASK_INIT_BEGIN
  sched_ext: Replace SCX_TASK_OFF_TASKS flag with SCX_TASK_DEAD state
  sched_ext: Inline scx_init_task() and move RESET_RUNNABLE_AT into scx_set_task_state()
  sched_ext: Cleanups in preparation for the SCX_TASK_INIT_BEGIN/DEAD work
  sched_ext: Use IRQ_WORK_INIT_HARD() to initialize sch->disable_irq_work
  sched_ext: Fix !CONFIG_EXT_SUB_SCHED build warnings
  sched_ext: Drop unused scx_find_sub_sched() stub
  sched_ext: Move scx_error() out of scx_link_sched()'s lock region

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