From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta1.migadu.com (out-209.mta1.migadu.com [95.215.58.209]) (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 0F77E46C847 for ; Mon, 21 Sep 2026 09:24:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.209 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789982669; cv=none; b=qg7AhpqtaLP4uiyo2kCz/FztJyk3cmjiH8jdABGDK+6UOV7mIfAJ5qJvNXtmwrSxPfZj3bc0ONB9ZREZblDag1REMHK+J6Eky4Wc527r3x0a/GxGgJ/jGVI14Aso0CPCMezA2kNrzedYFnPx1RN+6hvNHPy3BCUUXj6GB2ijtwE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789982669; c=relaxed/simple; bh=2f1S6gRWH7DPHgoPeU6kEsDfvjq6VTeSt0plIQ0isA4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=i1ee4TN8And/7D/QNv+mhrQS/jSKsOvCWzpthJ4bqrxH0kAH1/3lqcj/jz4F8UqM3MyEF9y1+J5B/w57Yy6jX0UY3PE1bJuiYMw2p2KNxOwdycBKbW7u1F6HXBVkhjFez7OI7WBkanyyRcWm7NdpSWtfUhNKVlk0UX4l9xKICwg= 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=WHMTgbRv; arc=none smtp.client-ip=95.215.58.209 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="WHMTgbRv" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=2f1S6gRWH7DPHgoPeU6kEsDfvjq6VTeSt0plIQ0isA4=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1789982665; v=1; x=1790587465; b=WHMTgbRvPSSXnOlneVAcev5VyOtGncaE0y3Jpse/ogTNR7KWreK5/5ybkWnl6Trv6v8EoRnN NKPfhVOT/BK3vrvilsbYl6fSjbqd4E+Z3BBQPcX5PvekNmQO6byuEByeva6zdZylPafhW45DTFU N9nBdyWHMhw8BBIBmq7T+keA= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id fe7b1edeab76f221; Mon, 21 Sep 2026 09:24:24 +0000 X-Mizu-Trace-ID: fe7b1edeab76f221 X-Migadu-Flow: FLOW_OUT From: Ye Liu To: Josh Poimboeuf , Steven Rostedt Cc: Ye Liu , Michal Hocko , SJ Park , Lorenzo Stoakes , Oleg Nesterov , akpm@linux-foundation.org, peterz@infradead.org, paulmck@kernel.org, mingo@redhat.com, mic@digikod.net, tglx@kernel.org, david@kernel.org, linmiaohe@huawei.com, nao.horiguchi@gmail.com, rafael@kernel.org, gnoack3000@gmail.com, gourry@gourry.net, 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 v4 12/15] unwind: convert process/thread iterator to for_each_process_thread_rculock Date: Mon, 21 Sep 2026 17:20:58 +0800 Message-Id: <20260921092101.89285-13-ye.liu@linux.dev> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260921092101.89285-1-ye.liu@linux.dev> References: <20260921092101.89285-1-ye.liu@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Ye Liu Replace guard(rcu)() combined with for_each_process_thread() loop in kernel/unwind/deferred.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 Acked-by: Steven Rostedt --- kernel/unwind/deferred.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/kernel/unwind/deferred.c b/kernel/unwind/deferred.c index 5bea47314254..ecfe1336095e 100644 --- a/kernel/unwind/deferred.c +++ b/kernel/unwind/deferred.c @@ -319,9 +319,8 @@ void unwind_deferred_cancel(struct unwind_work *work) synchronize_srcu(&unwind_srcu); - guard(rcu)(); /* Clear this bit from all threads */ - for_each_process_thread(g, t) { + for_each_process_thread_rculock(g, t) { atomic_long_andnot(BIT(bit), &t->unwind_info.unwind_mask); if (t->unwind_info.cache) -- 2.25.1