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Fri, 11 Sep 2026 09:10:50 -0700 (PDT) Received: from kernel.tail6741c6.ts.net ([185.220.238.35]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39d951d6b08sm5966320a91.8.2026.09.11.09.10.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Sep 2026 09:10:49 -0700 (PDT) From: Kunwu Chan To: paulmck@kernel.org, jiangshanlai@gmail.com, josh@joshtriplett.org Cc: rostedt@goodmis.org, mathieu.desnoyers@efficios.com, rcu@vger.kernel.org, linux-kernel@vger.kernel.org, Kunwu Chan , Zqiang Subject: [PATCH] srcutiny: Add lockdep and early-boot checks to synchronize_srcu_atomic() Date: Sat, 12 Sep 2026 00:09:13 +0800 Message-ID: <20260911160913.2859713-1-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-Transfer-Encoding: 8bit Add the RCU_LOCKDEP_WARN and early-boot check that the Tree version gained, srcu_lock_sync() was already present. Suggested-by: Zqiang Signed-off-by: Kunwu Chan --- kernel/rcu/srcutiny.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/rcu/srcutiny.c b/kernel/rcu/srcutiny.c index 99f8bfd98b04..76411562366f 100644 --- a/kernel/rcu/srcutiny.c +++ b/kernel/rcu/srcutiny.c @@ -361,6 +361,12 @@ void synchronize_srcu_atomic(struct srcu_struct *ssp) srcu_lock_sync(&ssp->dep_map); + RCU_LOCKDEP_WARN(lockdep_is_held(ssp), + "Illegal synchronize_srcu_atomic() in same-type SRCU read-side critical section"); + + if (rcu_scheduler_active == RCU_SCHEDULER_INACTIVE) + return; + if (IS_ENABLED(CONFIG_PREEMPTION)) synchronize_rcu(); // Needed for RCU Tasks Trace to imply RCU grace period. // And in Tiny RCU, it is near zero cost and doesn't block. -- 2.43.0