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Date: Thu, 22 Feb 2024 17:32:20 +0100
From: Frederic Weisbecker <frederic@kernel.org>
To: Boqun Feng <boqun.feng@gmail.com>
Cc: linux-kernel@vger.kernel.org, rcu@vger.kernel.org,
	Neeraj Upadhyay <Neeraj.Upadhyay@amd.com>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Chen Zhongjin <chenzhongjin@huawei.com>,
	Yang Jihong <yangjihong1@huawei.com>,
	Neeraj Upadhyay <quic_neeraju@quicinc.com>,
	Joel Fernandes <joel@joelfernandes.org>,
	Josh Triplett <josh@joshtriplett.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	Zqiang <qiang.zhang1211@gmail.com>
Subject: Re: [PATCH v2 4/6] rcu-tasks: Maintain lists to eliminate
 RCU-tasks/do_exit() deadlocks
Message-ID: <Zdd3FEWVnxaqdgHR@localhost.localdomain>
References: <20240217012745.3446231-1-boqun.feng@gmail.com>
 <20240217012745.3446231-5-boqun.feng@gmail.com>
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Le Fri, Feb 16, 2024 at 05:27:39PM -0800, Boqun Feng a ?crit :
> From: "Paul E. McKenney" <paulmck@kernel.org>
> 
> This commit continues the elimination of deadlocks involving do_exit()
> and RCU tasks by causing exit_tasks_rcu_start() to add the current
> task to a per-CPU list and causing exit_tasks_rcu_stop() to remove the
> current task from whatever list it is on.  These lists will be used to
> track tasks that are exiting, while still accounting for any RCU-tasks
> quiescent states that these tasks pass though.
> 
> [ paulmck: Apply Frederic Weisbecker feedback. ]
> 
> Link: https://lore.kernel.org/all/20240118021842.290665-1-chenzhongjin@huawei.com/
> 
> Reported-by: Chen Zhongjin <chenzhongjin@huawei.com>
> Reported-by: Yang Jihong <yangjihong1@huawei.com>
> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
> Tested-by: Yang Jihong <yangjihong1@huawei.com>
> Tested-by: Chen Zhongjin <chenzhongjin@huawei.com>
> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>

Reviewed-by: Frederic Weisbecker <frederic@kernel.org>