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Wysocki" Cc: Ye Liu , Michal Hocko , SJ Park , Lorenzo Stoakes , Oleg Nesterov , peterz@infradead.org, paulmck@kernel.org, mingo@redhat.com, rostedt@goodmis.org, jpoimboe@kernel.org, mic@digikod.net, tglx@kernel.org, akpm@linux-foundation.org, david@kernel.org, linmiaohe@huawei.com, nao.horiguchi@gmail.com, gnoack3000@gmail.com, gourry@gourry.net, rientjes@google.com, shakeel.butt@linux.dev, xu.xin16@zte.com.cn, chengming.zhou@linux.dev, will@kernel.org, boqun@kernel.org, frederic@kernel.org, neeraj.upadhyay@kernel.org, joelagnelf@nvidia.com, josh@joshtriplett.org, urezki@gmail.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, tony.luck@intel.com, reinette.chatre@intel.com, x86@kernel.org, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, pavel@kernel.org, lance.yang@linux.dev, mhiramat@kernel.org, pmladek@suse.com, longman@redhat.com, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, qiang.zhang@linux.dev, dietmar.eggemann@arm.com, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, kprateek.nayak@amd.com, mark.rutland@arm.com, Dave.Martin@arm.com, james.morse@arm.com, babu.moger@amd.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, rcu@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH v3 06/15] freezer: convert thread iterator to for_each_thread_rculock Date: Fri, 11 Sep 2026 15:57:51 +0800 Message-Id: <20260911075800.491472-7-ye.liu@linux.dev> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260911075800.491472-1-ye.liu@linux.dev> References: <20260911075800.491472-1-ye.liu@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: E5EFF40009 X-Stat-Signature: gtox3p3ibxd3wgphwaga3wn1pwm7567k X-Rspam-User: X-HE-Tag: 1789113587-840850 X-HE-Meta: U2FsdGVkX1+xYJh445kQ7VhDYjgZy3iETsdcaZbrxL5lP7ivU+xyrOkTRa5+N4Ipnc54eqU6bwXoqrrn73FLHuDYp6q4rYUVCnU19ZhIBsOMS/JRGk+15aknjqUK9dXApYrQIA1eVgGzuxDm3dkwk3FhbOGRhzTG/qynbVSnW8I0K64iXZgtGOPeSVdqEIXEN+ddEPWjaF9iJaz7QAMFYHQR2sH6eqmvfj7Cghv7PYAY3S6/WQcZSTwSxt3f+7HUVxO7OdJK1Z9ySUC+H1JUXuXmz7C+FydPBRu44PlHH4cm+gDKwHbatcavsLtPZPEdtMPArntErkxWuEz+uo1S/ssii4O8Xu01NihvtaL6k1R5cBh4l8sOPD/K9FjIchD6UMqep5yqYW1yw427u/taM7LSIFU7hGNiENzD6GQAMfUSQJ1IrIT2r/577k/XCFvKeM605c+928ICUg7YZQxPjGWDwuuGqzZXlyaaWjjpzgCjVjUBijF/d3t+ePYvqBZGk0oyI6LAxiZh/2s63pWOUbqGcVmeCbtlP8cv9OoGwhVfn8EaGL8/ZM0ZJvsF1Seo6s9xZXIj9MLrcdoZVAVw99z4KAnlgqhHQpoD1EjpQ7pWurCboFI7MYwtHHAsO0+2Jwn/FpBH8jBUHHMu9nfFSJbJ3+r3uoBkkWdHvze3p1TLIi3jLWj+7RanI+C+LH5BZNOVuH8pvm7FI+8ZLIPeX6QeFgdS9JMTfNdJKUoO/xxjXc3UOFRfJNIExsMDVds+k+R2oRr+O3lyxF6JI3124EYEdimacZ9YBLhKoiCiXVnz6TLMXGYpKUaqX5hkLFmh81/k3/K27qm63EMXPebYao/t49hUrvMIgosjT4iirWUval0r75atzyLTy7j5p1kzKVN0mI07rh5IwzfWdTG4jTybho+QngV6PJDGW1uqhCcCZGQzEXFtQ0pxy7RWStQHpFmKFRVQ28doBt6pi9m O/6YYiUP ktWV4AMwZmDR4/UCoqQgnwlQYJrtEQ4QHvjsbR6xEYkv22XZ5xsk1rZMqezQtCHRzPUk4z5b86t+gzQN/HkpjYjX34Bq5LtYhe3fLglNHxNfFc4fZUSAkyMjuFzfrhIb4eYiyylynBz/X3BOiD2TWFUedSYDZd4cvZiupy7vOeuEgJT+pvzC8fBZh5WHUL3fZ8cKVUmp0zc4RjNSpqic7r7T6hQIA0WbIFyykvwgT4yJfH3+WF9q6KldWB5UTZls2vkOZyj/XJ90kuWGsdtSTFg+vnweURb00qSPDbALNUTYlbPXg00hrZ3WT4gwu3g6h1drQT3LrZHPAHtgCX6Nq0oD/FEtUyxZdFlaDFh83mcIAJ9ecSy9aPQHO+JipxTcIyo/1x2ZbnvGOXu5N9mt629wkq0jcK2Q5GgfHgfz7tU+eAHrEJUFLH8oJPrWLNuBGbjsQCwZhnlBJ+Sg= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Ye Liu Replace the manual rcu_read_lock()/rcu_read_unlock() pair combined with for_each_thread() loop in kernel/freezer.c with for_each_thread_rculock(), which scopes the RCU read lock to the loop body via scoped_guard(rcu). No functional change. Signed-off-by: Ye Liu Acked-by: Michal Hocko Reviewed-by: SJ Park Reviewed-by: Lorenzo Stoakes (ARM) Reviewed-by: Oleg Nesterov --- Changes in v3: - Split from kernel/ patch in v2 (Peter Zijlstra, Steven Rostedt) Changes in v2: - Rename *_rcu to *_rculock kernel/freezer.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/kernel/freezer.c b/kernel/freezer.c index a76bf957fb32..7a870f71dcf6 100644 --- a/kernel/freezer.c +++ b/kernel/freezer.c @@ -217,11 +217,9 @@ void thaw_process(struct task_struct *p) { struct task_struct *t; - rcu_read_lock(); - for_each_thread(p, t) { + for_each_thread_rculock(p, t) { __thaw_task(t); } - rcu_read_unlock(); } /** -- 2.25.1