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Wysocki" Cc: Ye Liu , Michal Hocko , SJ Park , Lorenzo Stoakes , Oleg Nesterov , akpm@linux-foundation.org, peterz@infradead.org, paulmck@kernel.org, mingo@redhat.com, rostedt@goodmis.org, jpoimboe@kernel.org, mic@digikod.net, tglx@kernel.org, david@kernel.org, linmiaohe@huawei.com, nao.horiguchi@gmail.com, gnoack3000@gmail.com, gourry@gourry.net, 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, 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 Subject: [PATCH v4 06/15] freezer: convert thread iterator to for_each_thread_rculock Date: Mon, 21 Sep 2026 17:20:52 +0800 Message-Id: <20260921092101.89285-7-ye.liu@linux.dev> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260921092101.89285-1-ye.liu@linux.dev> References: <20260921092101.89285-1-ye.liu@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: D00B880002 X-Stat-Signature: awr4iysy98na4k4kcaz713xqx556fq8o X-HE-Tag: 1789982577-516865 X-HE-Meta: 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 32xXWaVA +laSm70QOzQjp0mNPsTDd+lX+gd84IdBEhH8be4c9vKcz/IXcoas03BR/nC2BVpYS8xkjoB6j4Pj7faDMD0gfa+WkWY4WnoKCcJDilJ6nL3XyoMtcAH6SjLKfEC23b+phFSkuxvrt7SKSK3tIpjDRqSQ7B1pMdB3G5wY9W3gJsG1kpYnv0GPB5g2jyu43wV7QRqXjNXbu/FwlXzbYUc90sf1V8hrZSqbPyGofnPtdQxSr49/kBIQaUtKZgRN/RQXSVXhKmH3t1z/g5lMnGXfJbKsjUWpXdfIzSgINmqlrRN4RSU8ZYZ5O+XbjpGFAMnMzyYFwgv6Ta4njbn0qKfKqBAq9C9CRgCLtxxfAzPqzIk7/FQX+ZMPH/TJsuhHx9w5Tol1a4rfuiZFHpIgbdgY1nDktVRgulgCmuZqkXD+Swo5Sh1v+EBQ6/5ZaDBsLg/tihdh+Vg325xJiftM= 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 --- 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