[PATCH v2 sched_ext/for-7.2 0/2] sched_ext: Follow-up fixes for exit_cpu accuracy

[Cheng-Yang Chou <yphbchou0911@gmail.com>]

Follow-up of Tejun's suggestion [1]:

Patch 1: Normalize "on cpu N" -> "on CPU N" in the exit dump header to
match UEI output style.

Patch 2: Fix exit_cpu accuracy for the hard lockup and RCU stall paths
which were recording the detector CPU instead of the actual hung/stalled
CPU. Touches kernel/rcu/tree_stall.h and kernel/rcu/tree_exp.h to thread
the stalled CPU through panic_on_rcu_stall().

Based on sched_ext/for-next (88588854c283).

Changes in v2:
- Use raw_smp_processor_id() in synchronize_rcu_expedited_wait() to
  avoid CONFIG_DEBUG_PREEMPT splat (preemption is enabled there after
  nbcon_cpu_emergency_exit()).
- Link to v1: 
  https://lore.kernel.org/r/20260501131521.161852-1-yphbchou0911@gmail.com/

[1]: https://lore.kernel.org/r/e7cbfc99b52b4b7059267bb81498179f@kernel.org/

Thanks,
Cheng-Yang

---

Cheng-Yang Chou (2):
  sched_ext: Normalize exit dump header to "on CPU N"
  sched_ext: Fix exit_cpu accuracy for lockup paths

 include/linux/sched/ext.h   |  4 ++--
 kernel/rcu/tree_exp.h       |  2 +-
 kernel/rcu/tree_stall.h     | 11 +++++++----
 kernel/sched/ext.c          | 16 +++++++++-------
 kernel/sched/ext_internal.h |  2 --
 5 files changed, 19 insertions(+), 16 deletions(-)

-- 
2.48.1