[GIT PULL] sched_ext: Fixes for v7.1-rc3

[Tejun Heo]

Hello, Linus.

The following changes since commit b34c82777a2c0648ee053595f4b290fd5249b093:

  sched_ext: idle: Recheck prev_cpu after narrowing allowed mask (2026-05-04 11:01:04 -1000)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git tags/sched_ext-for-7.1-rc3-fixes

for you to fetch changes up to 6ae315d37924435516d697ea7dde0b799a5928e0:

  sched_ext: Use HK_TYPE_DOMAIN_BOOT to detect isolcpus= domain isolation (2026-05-13 10:02:57 -1000)

----------------------------------------------------------------
sched_ext: Fixes for v7.1-rc3

Bulk 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.

----------------------------------------------------------------
Andrea Righi (4):
      selftests/sched_ext: Fix build error in dequeue selftest
      sched_ext: Fix ops->priv clobber on concurrent attach/detach
      sched_ext: Clear ops->priv on scx_alloc_and_add_sched() error paths
      sched_ext: Use HK_TYPE_DOMAIN_BOOT to detect isolcpus= domain isolation

Tejun Heo (13):
      sched_ext: Move scx_error() out of scx_link_sched()'s lock region
      sched_ext: Drop unused scx_find_sub_sched() stub
      sched_ext: Fix !CONFIG_EXT_SUB_SCHED build warnings
      sched_ext: Cleanups in preparation for the SCX_TASK_INIT_BEGIN/DEAD work
      sched_ext: Inline scx_init_task() and move RESET_RUNNABLE_AT into scx_set_task_state()
      sched_ext: Replace SCX_TASK_OFF_TASKS flag with SCX_TASK_DEAD state
      sched_ext: Close root-enable vs sched_ext_dead() race with SCX_TASK_INIT_BEGIN
      sched_ext: Close sub-sched init race with post-init DEAD recheck
      sched_ext: Handle SCX_TASK_NONE in disable/switched_from paths
      sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path
      sched_ext: Drop NONE early return in scx_disable_and_exit_task()
      sched_ext: INIT_LIST_HEAD() &sch->all in scx_alloc_and_add_sched()
      sched_ext: Defer sub_kset base put to scx_sched_free_rcu_work

Zqiang (1):
      sched_ext: Use IRQ_WORK_INIT_HARD() to initialize sch->disable_irq_work

 include/linux/sched/ext.h                   |  17 +-
 kernel/sched/ext.c                          | 277 ++++++++++++++++++++--------
 tools/testing/selftests/sched_ext/dequeue.c |   1 +
 3 files changed, 206 insertions(+), 89 deletions(-)

Thanks.

--
tejun