From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-218.mta0.migadu.com [91.218.175.218]) (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 D192B3EE1FE for ; Mon, 7 Sep 2026 08:13:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.218 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788768833; cv=none; b=sHgrba+ueKaohxm12e8FHUybiOdgk3LYEiMduyBTMo371ehLfgRSY+82mPW8QVi1ybtdrcYqxrL5GupBQLsaDbVkeHJZTt2RRRXQtSKBXV/A0xpkExrufZQOOq/5jaHO6IbyeATDEF18eYGLDAF9TEu+7zBOo9vtZNnEwDXLhMA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788768833; c=relaxed/simple; bh=WPjsFkKr6FEYMnlHhMl1nDBxkpUdBFsa1ndkFSmZ/0Q=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version:Content-Type; b=qAFaAfhUV3h7ZNQ9R3MLI1rYY5W+k7A5MFZJ/BilH6WaelP0KicB/UwGX6vLkQlVSJVc5Ji6qswJaZn4feJ/ukAwQixKgYa+R6sQzgo89+h7nbBHxemCh+Clj2jc31waBQbySMGgZrimJYO/JTxTKlTeuY/pmPI+wRmxDUW2SOs= 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=crrNKirS; arc=none smtp.client-ip=91.218.175.218 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="crrNKirS" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=WPjsFkKr6FEYMnlHhMl1nDBxkpUdBFsa1ndkFSmZ/0Q=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1788768828; v=1; x=1789373628; b=crrNKirSqCWRXtMKzcMLrd5Pr+KEL469evIyIDu0TuNSSltuuZgJPHpt1rJogB6oRN0/99hM nQnFgQYvjoiAgHCnf1L6IQynfj3mqIKlj4TLcxUCRfXwXHPGzd8tS0xRmj5V3wnp1uj3vngbMc2 wo/yPRoS2cZswZPb4rm8udr0= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 2103926bec6903fd; Mon, 07 Sep 2026 08:13:48 +0000 X-Mizu-Trace-ID: 2103926bec6903fd X-Migadu-Flow: FLOW_OUT From: Ye Liu To: Andrew Morton , Michal Hocko , Peter Zijlstra , "Paul E. McKenney" , Ingo Molnar , Steven Rostedt , Josh Poimboeuf , =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= , Oleg Nesterov , Thomas Gleixner Cc: Ye Liu , David Hildenbrand , Miaohe Lin , Naoya Horiguchi , "Rafael J. Wysocki" , =?UTF-8?q?G=C3=BCnther=20Noack?= , Lorenzo Stoakes , SJ Park , 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, 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 Subject: [PATCH v2 0/8] sched: introduce for_each_process_rculock and for_each_thread_rculock Date: Mon, 7 Sep 2026 16:13:26 +0800 Message-Id: <20260907081334.1152889-1-ye.liu@linux.dev> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Ye Liu Introduce for_each_process_rculock(), for_each_thread_rculock() and for_each_process_thread_rculock() macros that combine the existing iteration macros with scoped_guard(rcu), so that the RCU read lock is automatically acquired before iteration and released when the loop exits — including via break, goto, or return. The rest of the series converts manual rcu_read_lock()/ rcu_read_unlock() and guard(rcu)() pairs across mm/, kernel/, fs/, lib/ and security/ to use the new macros. Changes since v1 [1]: - Rename macros from *_rcu to *_rculock, as suggested by Steven Rostedt and acked by Thomas Gleixner, to avoid confusion with existing *_rcu() list iterators that expect the caller to hold the RCU read lock. - Improve the comment on for_each_process_thread_rculock() to document that 'break' only exits the inner loop and 'goto' is needed to exit both loops (Thomas Gleixner). - Rename the stale 'unlock:' label to 'out:' in hung_task.c, as noted by Günther Noack. - Clarify in patch 4 that page_pgoff() is safe outside the RCU read-side critical section (SJ Park). - CC all relevant maintainers on every patch (Lorenzo Stoakes). - Drop the mm: prefix from patch 1, as the macros are in include/linux/sched/signal.h (Michal Hocko). Patch 1 may trigger checkpatch "Macros with complex values should be enclosed in parentheses" errors. These are false positives — the scoped_guard() pattern is a control-flow construct, not a multi- statement macro, and the same idiom is used elsewhere in the kernel. Suggested by Michal Hocko for the oom_kill path [2]. [1] https://lore.kernel.org/all/20260904083001.553587-1-ye.liu@linux.dev/ [2] https://lore.kernel.org/all/20260813092933.562028-1-ye.liu@linux.dev/ Ye Liu (8): sched: introduce for_each_process_rculock and for_each_thread_rculock mm/oom_kill: convert process/thread iterators to for_each_*_rculock mm/ksm: convert process iterator to for_each_process_rculock mm/memory-failure: convert process iterator to for_each_process_rculock kernel: convert process/thread iterators to for_each_*_rculock fs: convert process/thread iterators to for_each_*_rculock lib: convert process iterator to for_each_process_rculock security/landlock: convert thread iterator to for_each_thread_rculock fs/proc/base.c | 4 +--- fs/resctrl/rdtgroup.c | 8 ++------ include/linux/sched/signal.h | 25 +++++++++++++++++++++++++ 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 +-- lib/is_single_threaded.c | 5 +---- mm/ksm.c | 4 +--- mm/memory-failure.c | 16 ++++------------ mm/oom_kill.c | 20 +++++--------------- security/landlock/tsync.c | 8 ++------ 17 files changed, 54 insertions(+), 81 deletions(-) Signed-off-by: Ye Liu -- 2.25.1