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McKenney" , rcu@vger.kernel.org Cc: Ching-Chun Huang , Chia-Ping Tsai , yphbchou0911@gmail.com Subject: [PATCH v2 sched_ext/for-7.2 0/2] sched_ext: Follow-up fixes for exit_cpu accuracy Date: Tue, 5 May 2026 00:08:18 +0800 Message-ID: <20260504161543.674488-1-yphbchou0911@gmail.com> X-Mailer: git-send-email 2.48.1 Precedence: bulk X-Mailing-List: rcu@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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