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Mon, 14 Sep 2026 02:34:47 -0700 (PDT) From: Kunwu Chan To: jiangshanlai@gmail.com, paulmck@kernel.org Cc: josh@joshtriplett.org, rostedt@goodmis.org, mathieu.desnoyers@efficios.com, rcu@vger.kernel.org, linux-kernel@vger.kernel.org, Kunwu Chan Subject: [PATCH 0/5] srcu: Add lockdep coverage for atomic SRCU and fix IRQ-state bug Date: Mon, 14 Sep 2026 17:34:14 +0800 Message-ID: <20260914093419.1474829-1-kunwu.chan@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The atomic SRCU fastpath enables synchronize_srcu_atomic() to be called from contexts with interrupts disabled. This series extends the rcutorture lockdep tests to cover the atomic SRCU path and fixes an IRQ-state preservation bug discovered along the way. Patch 1-2 add lockdep test coverage for atomic SRCU: - testtype 4: same-type atomic SRCU deadlock - testtype 5: atomic SRCU + raw spinlock dependency cycle - testtype 6: rcu_read_lock() → synchronize_srcu_atomic() legitimate nesting, must not trigger lockdep warning Patch 3 fixes a bug where the synchronize_srcu_atomic() call chain unconditionally re-enables interrupts on unlock, by switching to the irqsave/irqrestore variants throughout the call chain. Patch 4 fixes a pre-existing double nerrs count in the script. Patch 5 adds testtype 7: cross-CPU IRQ context mismatch detection, where an atomic SRCU reader held with IRQs enabled on one CPU is paired with synchronize_srcu_atomic() via IPI on another CPU. Kunwu Chan (5): rcutorture: Add atomic SRCU lockdep support selftests/rcutorture: Wire atomic SRCU into srcu_lockdep.sh srcutree: Preserve IRQ state in synchronize_srcu_atomic() callchain selftests/rcutorture: Fix double nerrs count in srcu_lockdep.sh rcutorture: Add atomic SRCU cross-CPU IRQ context mismatch test kernel/rcu/rcutorture.c | 109 +++++++++++++++++- kernel/rcu/srcutree.c | 42 ++++--- .../selftests/rcutorture/bin/srcu_lockdep.sh | 77 ++++++++++++- 3 files changed, 205 insertions(+), 23 deletions(-) -- 2.43.0