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Fri, 11 Sep 2026 08:00:40 +0000 X-Mizu-Trace-ID: 8a1a8142b4b29e09 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 , paulmck@kernel.org, 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, rafael@kernel.org, gnoack3000@gmail.com, gourry@gourry.net, 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, 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 08/15] locking/lockdep: convert process/thread iterators to for_each_*_rculock Date: Fri, 11 Sep 2026 15:57:53 +0800 Message-Id: <20260911075800.491472-9-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-Rspam-User: X-Rspamd-Queue-Id: 325401C0006 X-Stat-Signature: f83nyswoypia5tjmirk6z35737uq9cto X-Rspamd-Server: rspam01 X-HE-Tag: 1789113641-81666 X-HE-Meta: U2FsdGVkX1+/nAEd2kqdMGq+EsQT67aQPusMcAUef/53SVvueSl2Zs3Pn3syan3OhHJdlbq8GkNqzgTzYGiiUTtP/kCgiu7VBqtXSU+0LttBP9gw7UkVYdrzSm4LdkRUn0/DtsID4/EPHiyqAwKI53Pmr06TLS1hyp9TdlayYxAPur7C12q0QSzATtTdDtFG337PRV9hX7G8Vd+zhP8BSvUP4MoRCSjkVKPR0/Z4tmjySy5jTc+q1eWDOvzLeA16sn+CNtOR+4HCMsDPUGYFwaxIjEgBVBb5chv6QwOYhS1LBKQbXYE+yw/Yo1elDYyqLCIJrQLUkD9AxH6X2upc7t3+Vzr8GvPjJDD1/JvbYddZIDHlWPmdA3vfkpZzaN63egdFFomYwl4mEwg1VD6Er9Y0ps+tBxTNXD26lythFkEjpPAvbmeygtAMa8xFk+cXYbSpEkvAIzvZA34++s6YLsqHTtq5t6mbwNxhsDeSrON/2d17fHbgNUyikYnB07xHPLexgM5fFiYqlmi8a7axnnlWT8SJ9ZEHE0RJaXX1aUadTNT/cabZaMJ1REyaqVgsdzWD7dwpjqLJVh39YhizbypMnDroHAHH5R+CGx1BYPgYwRwUsgZ3sdPBxCEKk+Fl9cgq0V8oHOZGqbrHtwE6/IvJe5jfkveEclpMoHpnkV4pO+hYgzi/BzNIGpMraAMoR4igOasHB0xRXGE1t5sZSxHyQra+PPnRZ9SFW/NGSMPE27AWPGX4roLbe4PQAshd9w4F7YcxTsmidI8ZhWrXC0tQh5yjbWnuhsO9bERhVJWES55t5YNatDLrJ4ryr0ScKZlolSROMWbOwBGwbEu+RgfoBuMOyxTMjPeJivnOq9Ltxbokas5juWPgkQ1J1QJHyjpkEVNN131sw0uoQJzGZeTGmij/o4sfEf9AbbF2YClv6AHnjvHmYVFMnTxD8C77u+Gb/QJNoWi5YspBs9O e2jOQRdI LBroxKuy2LpBMpV7NrZeHygNN8I9G4p8Vu/3fIhVehAHKh/1u91iwCwqb8RmUBdlMpftR447R5wXAi3gVYDaS0y4Lzdth6DwTigNVbOPq+fnIJWVMLV8IqPS5wNhKUXYPvXxe03+c9NYqyJZJAXfYzzEMuCP3z+Qj858udA5N74W/rS9soWMJ5xSDIr1pS+tdsKWfrB3TYTSx9BNToDh1Ej3HVy/k5NSRTIUo+zM4nAmXQsqizhOqIctHtg/Iwc3EOAfXHW4KljPzYbqDRE/o1ROTPpboplZJoMDMee5Wzkh/2XOUX5ZzGXWd+sD4a0+htHuSdhxGjqJhgVoNjblEHylgjlCBiJIncTDYOewTCjHAd6xllGQ77o3wxdKH+e9d7WDZPhaNVQERViW8zIFSb39kwGANZkzc+NOVi75RpdEafGHLVXsIRUXmUiYRAoGDEyJ4/xK06Ux6wtI= 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 --- Changes in v3: - Split from kernel/ patch in v2 (Peter Zijlstra, Steven Rostedt) Changes in v2: - Rename *_rcu to *_rculock 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