linux-kernel - Re: [PATCH tip/core/rcu 1/3] rcu-tasks: *_ONCE() for rcu_tasks_cbs

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Date:   Tue, 18 Feb 2020 18:13:23 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>, rcu@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, dhowells@...hat.com,
        edumazet@...gle.com, fweisbec@...il.com, oleg@...hat.com,
        joel@...lfernandes.org
Subject: Re: [PATCH tip/core/rcu 1/3] rcu-tasks: *_ONCE() for
 rcu_tasks_cbs_head

On Tue, 18 Feb 2020 14:54:55 -0800
"Paul E. McKenney" <paulmck@...nel.org> wrote:

>     This data race was reported by KCSAN.  Not appropriate for backporting
>     due to failure being unlikely and due to the mild consequences of the
>     failure, namely a confusing rcutorture console message.
>     

I've seen patches backported for less. :-/

Really, any statement that says something may go awry with the code,
will be an argument to backport it.

-- Steve