From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-70.mta0.migadu.com [91.218.175.70]) (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 017B545D904 for ; Fri, 11 Sep 2026 08:00:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789113645; cv=none; b=O0qC0OmfoGqN0bZMlX+ZgxPS89gVS1H5gsWAI9sC9y42WvULbE+9CbHRNoW5aCQCkYMH8m3pttQieP593vaANr/pwc5S44ZDQjOkSgOM9WwPfbItaEDA9k7Zinw06h2lUDHA3vzj0f6nOxa62lPt/8pEnVP0ZdogINvz6Q2ws3s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789113645; c=relaxed/simple; bh=MtMBUy3cqPkSQ7l9jm2rwShEJTacHCBGS65FBTs1ICA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=YYgXQOq53S8qFtgH2HwxG+3EOIHv3Ix5C0x9OC9z/ejUolJyRDerc4OlC65cg/rE3NnKlLSSwWcseikfVRE5/6QodNk9ib5JPWC5SrNgzWVlOmQCLzv/cJ8MfO0Z8kSrWJxAPj+0k5+3z6mtLfCLO+Rcr4je55I73jJQ+csPn98= 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=h+UYEGLu; arc=none smtp.client-ip=91.218.175.70 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="h+UYEGLu" X-Envelope-To: linux-security-module@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=MtMBUy3cqPkSQ7l9jm2rwShEJTacHCBGS65FBTs1ICA=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1789113640; v=1; x=1789718440; b=h+UYEGLu+JS6dSQAwygoKqN/w8blqIv7PNIoSYGhCFG+DyDpdRJmlZ6n/Pn6/3piqWH0gLJO tch7S15FW7DY/CF1ayzqIWxfIRwjpg6QP6XW5ce00zQBsg3PqGXqGUTIr+3NXK/kd0Lz7lxX5N9 l5EUO+smI4QrwoNDexUqD9h4= X-Envelope-To: linux-security-module@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 8a1a8142b4b29e09; 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> 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() 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