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Fri, 11 Sep 2026 08:02:28 +0000 X-Mizu-Trace-ID: 7ddc78a39b3151cc X-Migadu-Flow: FLOW_OUT From: Ye Liu To: Andrew Morton Cc: Ye Liu , Michal Hocko , Lorenzo Stoakes , Gregory Price , SJ Park , peterz@infradead.org, paulmck@kernel.org, mingo@redhat.com, rostedt@goodmis.org, jpoimboe@kernel.org, mic@digikod.net, oleg@redhat.com, tglx@kernel.org, david@kernel.org, linmiaohe@huawei.com, nao.horiguchi@gmail.com, rafael@kernel.org, gnoack3000@gmail.com, 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 14/15] lib: convert process iterator to for_each_process_rculock Date: Fri, 11 Sep 2026 15:57:59 +0800 Message-Id: <20260911075800.491472-15-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: rspam04 X-Rspam-User: X-Stat-Signature: ac7jw34b1zpcc65q7cgtj8t7wkyc9fee X-Rspamd-Queue-Id: 3A5271C0003 X-HE-Tag: 1789113749-801954 X-HE-Meta: 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 I/ZD8D/Q wZpSi7xGtW+IFZxdVzILLLrBmyUByny45qfmgthe0rwpNUyD/5EX8pdph3e3/drpQ8Xqa1EHDXW2mMijIvz5DfmLcudCR5AeTnFEw0Fim1o/DNjRiP1LtOlSX+Fm4vmAo/YZ8X/EZpT+ipkocQQkY0hQkh3K1UawKGaDUem18t5GIv2B6V56LL03oHrMe0EtvUl5HrhjixNUfJSR141XgsXyrnXI2JImo6oeEh2c1CSa2jebDyhzvG8WZkJSnBHcacDjMQottrqx21LiDSrAW3Bww+o7MxztlTqLubv0KDmjJZBNUW9V9Iihe/XUizUaUYhRWtagrPPmJLIhHAz+9bCZS8OLAJ1ldWIpKMmuKdoux2bXXPysanfym2Hcszyw97HyhS4CfSrrG7ZHvuNgliILuFmE9sIi4zOpXqWbTbOMKYexFhEhbkKWIgqANgqzlbYEA0dSlaiIB61tg1I5UXFd0GJUk5Q035V0YMN8lVZXp7g0= 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() loop in lib/ with for_each_process_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: Lorenzo Stoakes (ARM) Reviewed-by: Gregory Price (Meta) Reviewed-by: SJ Park --- Changes in v2: - Rename *_rcu to *_rculock lib/is_single_threaded.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/lib/is_single_threaded.c b/lib/is_single_threaded.c index 8c98b20bfc41..4e7fe85454ab 100644 --- a/lib/is_single_threaded.c +++ b/lib/is_single_threaded.c @@ -26,8 +26,7 @@ bool current_is_single_threaded(void) return true; ret = false; - rcu_read_lock(); - for_each_process(p) { + for_each_process_rculock(p) { if (unlikely(p->flags & PF_KTHREAD)) continue; if (unlikely(p == task->group_leader)) @@ -48,7 +47,5 @@ bool current_is_single_threaded(void) } ret = true; found: - rcu_read_unlock(); - return ret; } -- 2.25.1