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Mon, 15 Sep 2025 21:49:00 -0700 (PDT) From: pengdonglin To: tj@kernel.org, tony.luck@intel.com, jani.nikula@linux.intel.com, ap420073@gmail.com, jv@jvosburgh.net, freude@linux.ibm.com, bcrl@kvack.org, trondmy@kernel.org, longman@redhat.com, kees@kernel.org Cc: bigeasy@linutronix.de, hdanton@sina.com, paulmck@kernel.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, linux-nfs@vger.kernel.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org, netdev@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-wireless@vger.kernel.org, linux-acpi@vger.kernel.org, linux-s390@vger.kernel.org, cgroups@vger.kernel.org, pengdonglin , Paul Moore , James Morris , pengdonglin Subject: [PATCH v3 07/14] yama: Remove redundant rcu_read_lock/unlock() in spin_lock Date: Tue, 16 Sep 2025 12:47:28 +0800 Message-Id: <20250916044735.2316171-8-dolinux.peng@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250916044735.2316171-1-dolinux.peng@gmail.com> References: <20250916044735.2316171-1-dolinux.peng@gmail.com> Precedence: bulk X-Mailing-List: linux-rt-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: pengdonglin Since commit a8bb74acd8efe ("rcu: Consolidate RCU-sched update-side function definitions") there is no difference between rcu_read_lock(), rcu_read_lock_bh() and rcu_read_lock_sched() in terms of RCU read section and the relevant grace period. That means that spin_lock(), which implies rcu_read_lock_sched(), also implies rcu_read_lock(). There is no need no explicitly start a RCU read section if one has already been started implicitly by spin_lock(). Simplify the code and remove the inner rcu_read_lock() invocation. Cc: Kees Cook Cc: Paul Moore Cc: James Morris Signed-off-by: pengdonglin Signed-off-by: pengdonglin --- security/yama/yama_lsm.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c index 3d064dd4e03f..60d38deb181b 100644 --- a/security/yama/yama_lsm.c +++ b/security/yama/yama_lsm.c @@ -117,14 +117,12 @@ static void yama_relation_cleanup(struct work_struct *work) struct ptrace_relation *relation; spin_lock(&ptracer_relations_lock); - rcu_read_lock(); list_for_each_entry_rcu(relation, &ptracer_relations, node) { if (relation->invalid) { list_del_rcu(&relation->node); kfree_rcu(relation, rcu); } } - rcu_read_unlock(); spin_unlock(&ptracer_relations_lock); } @@ -152,7 +150,6 @@ static int yama_ptracer_add(struct task_struct *tracer, added->invalid = false; spin_lock(&ptracer_relations_lock); - rcu_read_lock(); list_for_each_entry_rcu(relation, &ptracer_relations, node) { if (relation->invalid) continue; @@ -166,7 +163,6 @@ static int yama_ptracer_add(struct task_struct *tracer, list_add_rcu(&added->node, &ptracer_relations); out: - rcu_read_unlock(); spin_unlock(&ptracer_relations_lock); return 0; } -- 2.34.1