From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-42.mta0.migadu.com [91.218.175.42]) (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 85DF945D92E for ; Fri, 11 Sep 2026 08:01:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.42 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789113718; cv=none; b=NXFyJ6hV6x4EwN+AMHUlqN13gnDlAL665ejXInb6a9oS0p/lNQtbNS/faOVaf8ZjrZQPIYsU1euPvc8z/rEyv9Sieq/hKXVrNFqbovrcbWT5DFheYutEN1ewBcjE0y7Ie154CO2+VxjjyuXYhoTcpr8Z0XAexhXU2WuSxq/7S3I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789113718; c=relaxed/simple; bh=Re/ZsMyjr8Kl1M8Xab8XaAEgyJ6r9rT2dZ2X4TDsND8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=aMqspSUDvAEsFZU5g/d5mOdWNt5crkw+kzf1jdTRTrrKhqV0S2a8jS6L3CsK5v2FPaLDr433eKyOsKfM4rZWV/9CSljixmhkxkU+7pxSMa6CWqAXf3/SHMOsys6jzIwUv/kWNaHY/uQDoL8H8FavK4HysgCQf0qxVEt3HmKAysU= 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=UjcPcQDO; arc=none smtp.client-ip=91.218.175.42 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="UjcPcQDO" X-Envelope-To: linux-security-module@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=Re/ZsMyjr8Kl1M8Xab8XaAEgyJ6r9rT2dZ2X4TDsND8=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1789113714; v=1; x=1789718514; b=UjcPcQDOh7J6vkpFrcteNi1zUz7dIM0nAAKZgQgvTarbMJTiE3coDjU8Pj2EWY5fivxKe2dd LEC4NFSI9WGVGdZkhi4ERY6K2Yb8H0qpVALmaZf51lH8v27JXszGAfsroYwza3D5hPPzD0KUVFO U10C4ohj7jdtjyqcH6sxNZ9Q= X-Envelope-To: linux-security-module@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 67efd391483b1f6c; Fri, 11 Sep 2026 08:01:53 +0000 X-Mizu-Trace-ID: 67efd391483b1f6c X-Migadu-Flow: FLOW_OUT From: Ye Liu To: Josh Poimboeuf , Steven Rostedt Cc: Ye Liu , Michal Hocko , SJ Park , Lorenzo Stoakes , Oleg Nesterov , peterz@infradead.org, paulmck@kernel.org, mingo@redhat.com, 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, 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 12/15] unwind: convert process/thread iterator to for_each_process_thread_rculock Date: Fri, 11 Sep 2026 15:57:57 +0800 Message-Id: <20260911075800.491472-13-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 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 --- Changes in v3: - Split from kernel/ patch in v2 (Peter Zijlstra, Steven Rostedt) Changes in v2: - Rename *_rcu to *_rculock 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