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

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Message-ID: <20200218235406.GO2935@paulmck-ThinkPad-P72>
Date:   Tue, 18 Feb 2020 15:54:06 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.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, Feb 18, 2020 at 06:13:23PM -0500, Steven Rostedt wrote:
> 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.

You aren't kidding!  Rumor has it that someone tried backporting the
RCU flavor-consolidation work, for but one example.  Though I cannot
help but salute the level of insanity represented by that attempt.  ;-)

							Thanx, Paul