From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ABF4D375F7B for ; Tue, 8 Sep 2026 06:43:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788849790; cv=none; b=tOgs6qLWlJc+m8WPpzKruOA+6DO6cCKdNA251QDhNrXc0GPhkakN4hWCzjzDTz4IlDeZvm+1gNicYRcg80HIsClKHMkJzMoCEjT+81bDW2uCJIZ2vrt5WXMF+Tn5nanOX5tcE96lM76i6FCcgJgVRWadpOQihGW5cFlW4IZ6K6E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788849790; c=relaxed/simple; bh=r81amRFlPjzeUTmfDZcNSSRmn8+UhK/PkcDEwxOg4Ww=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: In-Reply-To:Content-Type:Content-Disposition; b=RSYbrfbV2EJUssaUX5v/e8Z/GHEAzYpYBuoAJFND0ZKuoFh/0PxFCqGCewOSpcxZ0/g8qHibGHY5nA6xvQyAFhVtZ/3ETZ69lzTVlcN3mgQCJCKBIvwXT2H/mYKUUu5opAcQalKHDvmUliT+tEI4XmsnsIlPNlL6SFakfh+pg/M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=KU5M/3Dr; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="KU5M/3Dr" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1788849787; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YW1GKuJRhHZmwuIL2WlsvAjfLcvMatnxv0NMJQFIHUY=; b=KU5M/3DrhS1HaSOfj92OCd3lfcyN/Kr+j3CCnpGaXYYgoJOzQvTMmoztSBBfzwmPK3S3Sn M4vl70MRxHUMrREKPFOvNc9ugE7L05o29FHpvJ1r0WLuYTsVSfzT9+13XyUkzjzFyUjkpT NHJEazXtiXwrIBYWcXdE3ms3MJrtQSU= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-446-K15Hh85TMv-qJLfCPFJEfw-1; Tue, 08 Sep 2026 02:43:04 -0400 X-MC-Unique: K15Hh85TMv-qJLfCPFJEfw-1 X-Mimecast-MFC-AGG-ID: K15Hh85TMv-qJLfCPFJEfw_1788849783 Received: from mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.95]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id D4D75195E918; Tue, 8 Sep 2026 06:43:02 +0000 (UTC) Received: from fedora (headnet04.pony-001.prod.iad2.dc.redhat.com [10.2.32.116]) by mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with SMTP id 59C205B1; Tue, 8 Sep 2026 06:42:46 +0000 (UTC) Received: by fedora (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Tue, 8 Sep 2026 08:43:02 +0200 (CEST) Date: Tue, 8 Sep 2026 08:42:45 +0200 From: Oleg Nesterov To: Ye Liu Cc: Thomas Gleixner , Peter Zijlstra , "Rafael J. Wysocki" , Andrew Morton , Ingo Molnar , Will Deacon , Boqun Feng , "Paul E. McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Uladzislau Rezki , Juri Lelli , Vincent Guittot , Steven Rostedt , Masami Hiramatsu , Josh Poimboeuf , Ye Liu , Michal Hocko , mic@digikod.net, david@kernel.org, linmiaohe@huawei.com, nao.horiguchi@gmail.com, gnoack3000@gmail.com, ljs@kernel.org, sj@kernel.org, rientjes@google.com, shakeel.butt@linux.dev, xu.xin16@zte.com.cn, chengming.zhou@linux.dev, 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, 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: Re: [PATCH v2 5/8] kernel: convert process/thread iterators to for_each_*_rculock Message-ID: References: <20260907081334.1152889-1-ye.liu@linux.dev> <20260907081334.1152889-6-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 In-Reply-To: <20260907081334.1152889-6-ye.liu@linux.dev> X-Scanned-By: MIMEDefang 3.6 on 10.30.177.95 X-Mimecast-MFC-PROC-ID: PgvXNSE0oo5rV-BwRxp72TbsX60b3DdEB7MFsISB_xk_1788849783 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit On 09/07, Ye Liu wrote: > > From: Ye Liu > > Replace the manual rcu_read_lock()/rcu_read_unlock() and guard(rcu) > pairs combined with for_each_process(), for_each_thread() and > for_each_process_thread() loops across kernel/ with the > for_each_*_rculock() macros, which scope the RCU read lock to the > loop body via scoped_guard(rcu). > > No functional change. > > Signed-off-by: Ye Liu > Acked-by: Michal Hocko > --- > Changes in v2: > - Rename *_rcu to *_rculock > - Rename stale 'unlock:' label to 'out:' in hung_task.c (Günther Noack) > kernel/cpu.c | 4 +--- > kernel/freezer.c | 4 +--- > kernel/hung_task.c | 11 ++++------- > kernel/locking/lockdep.c | 4 +--- > kernel/rcu/update.c | 4 +--- > kernel/sched/core.c | 3 +-- > kernel/sched/debug.c | 4 +--- > kernel/trace/fgraph.c | 8 ++------ > kernel/unwind/deferred.c | 3 +-- Reviewed-by: Oleg Nesterov