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Mon, 21 Sep 2026 09:23:23 +0000 X-Mizu-Trace-ID: c4a69cd911b0a5e9 X-Migadu-Flow: FLOW_OUT From: Ye Liu To: Peter Zijlstra , Ingo Molnar , Will Deacon , Boqun Feng Cc: Ye Liu , Michal Hocko , SJ Park , Lorenzo Stoakes , Oleg Nesterov , akpm@linux-foundation.org, paulmck@kernel.org, rostedt@goodmis.org, jpoimboe@kernel.org, mic@digikod.net, tglx@kernel.org, david@kernel.org, linmiaohe@huawei.com, nao.horiguchi@gmail.com, rafael@kernel.org, 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, 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 08/15] locking/lockdep: convert process/thread iterators to for_each_*_rculock Date: Mon, 21 Sep 2026 17:20:54 +0800 Message-Id: <20260921092101.89285-9-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-Rspamd-Server: rspam04 X-Rspam-User: X-Stat-Signature: m8un9pyn5su5yn7uhoojpon11umhdfpe X-Rspamd-Queue-Id: A996EC0005 X-HE-Tag: 1789982604-386477 X-HE-Meta: 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 dzKl1US3 FogwmiVPzc1x84vGBfGjyKdISvLQK1PJZ6cVXUBr4bKk1KCgZ+VA9mmn6Ex5f0lmYYN0neIlhdZpwrs+d3CsHMAvIUl2uqtx/mJpfmFAS9iIP7PaRD/SkWkSEHHkWtm1labiKKLtbPZs+MVuJV/BZ/SY3SdYq7FYC/2/S3E3tD8uxCnko+YttR+VIDx6a2sT76SSbaexycplyAaTyzoEHMlMaH654AfW1bq8QScDrsPuDgT39Neag/TboYo67vGMrx0RiSSQNvO1zsxuCcBEfq2vBQRX+4ASvRioYs5qL9dyp17aWnSLdKP/nuAjc96hCX5XDpTI1xFucDt80DspKTXGLyB4P9QE6xEYq3eEghw/9KmqhDOqWoo5Uz1QDspNa5scv5eKjpD+yDv0N1PBZbIZrWYYQG6klc4tMQ3Z15Z+CW9KnkF0ZDzcuZ4NR011ZSfH39pU11MK3lJM= 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_process_thread() loop in kernel/locking/lockdep.c with for_each_process_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/locking/lockdep.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index c56a7f91d72e..ea218dc75ad5 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -6834,15 +6834,13 @@ void debug_show_all_locks(void) } pr_warn("\nShowing all locks held in the system:\n"); - rcu_read_lock(); - for_each_process_thread(g, p) { + for_each_process_thread_rculock(g, p) { if (!p->lockdep_depth) continue; lockdep_print_held_locks(p); touch_nmi_watchdog(); touch_all_softlockup_watchdogs(); } - rcu_read_unlock(); pr_warn("\n"); pr_warn("=============================================\n\n"); -- 2.25.1