From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-176.mta0.migadu.com [91.218.175.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A1AE2432BE6 for ; Fri, 11 Sep 2026 08:01:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.176 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789113684; cv=none; b=Pik/xwoDe8Ttv6mi8RNp0ZyMiEh6nVxI301r6beEnzRlvE0c4ielmgwWsNtJAdcNn34ohZ/Ui6lEapAvKupagKbTMKYCpW9SlExXpobG8VoYrDczFSY6rBUAx6EdUHDe3mQz+clUsCkyAK/yGtSJVj9V6OL/Rvhkv98F6+gKTls= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789113684; c=relaxed/simple; bh=0hlRYPmyXV54QvYh0kyMJR49RsE/MghM4TVAvWeaXWw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=q8CY3/I0s5s8HlzebtMhLsi9Eh/DoS3RhG/ZkAMOtF9GLlAUqk7g9YIuePr+viF8YQcKzX1FrR4vPFjsKise/Ze4xoIFp1rj0A/YDeU832RGbJExrtWfuPzOiXvD59CslFfkLHdukKacOD2DkMyzSantbaMql+bRNM8UqFB1nLg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=K0T4axFF; arc=none smtp.client-ip=91.218.175.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="K0T4axFF" X-Envelope-To: linux-security-module@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=0hlRYPmyXV54QvYh0kyMJR49RsE/MghM4TVAvWeaXWw=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1789113678; v=1; x=1789718478; b=K0T4axFFAV3j7dfLX72ytjaA4PfYKcc7fDPwlpRoDhS5ZtKFLL72iTWfjc5JT7ObaS5kfWfY SF2ow5NZ3X/1EZmte6oABZ5GCFHu6htIjR1bkG25/nEvSny+T9P/ph9hxk3E+OM8taNI1ShcJdp A/0fvg7g+ehqYaK9EjeNApMw= X-Envelope-To: linux-security-module@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id e4dd3759505df11b; Fri, 11 Sep 2026 08:01:17 +0000 X-Mizu-Trace-ID: e4dd3759505df11b X-Migadu-Flow: FLOW_OUT From: Ye Liu To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot 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, will@kernel.org, boqun@kernel.org, frederic@kernel.org, neeraj.upadhyay@kernel.org, joelagnelf@nvidia.com, josh@joshtriplett.org, urezki@gmail.com, 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 10/15] sched: convert process/thread iterators to for_each_*_rculock Date: Fri, 11 Sep 2026 15:57:55 +0800 Message-Id: <20260911075800.491472-11-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> Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Ye Liu Replace the manual rcu_read_lock()/rcu_read_unlock() and guard(rcu) pairs combined with for_each_process_thread() loops in kernel/sched/ 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/sched/core.c | 3 +-- kernel/sched/debug.c | 4 +--- 2 files changed, 2 insertions(+), 5 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 0697ed0f1c3d..fd5bdd2cb798 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2005,8 +2005,7 @@ static void uclamp_sync_util_min_rt_default(void) smp_mb__after_spinlock(); read_unlock(&tasklist_lock); - guard(rcu)(); - for_each_process_thread(g, p) + for_each_process_thread_rculock(g, p) uclamp_update_util_min_rt_default(p); } diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index 72236db67983..cdae165b98f7 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -1029,14 +1029,12 @@ static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu) #endif "\n"); - rcu_read_lock(); - for_each_process_thread(g, p) { + for_each_process_thread_rculock(g, p) { if (task_cpu(p) != rq_cpu) continue; print_task(m, rq, p); } - rcu_read_unlock(); } void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) -- 2.25.1