linux-kernel - Re: [PATCH rcu 6/6] rcu: Allow up to five minutes expedited RCU CPU stall-warning timeouts

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Message-ID: <20230109151336.GO4028633@paulmck-ThinkPad-P17-Gen-1>
Date:   Mon, 9 Jan 2023 07:13:36 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...a.com, rostedt@...dmis.org,
        Dave Chinner <david@...morbit.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH rcu 6/6] rcu: Allow up to five minutes expedited RCU CPU
 stall-warning timeouts

On Mon, Jan 09, 2023 at 11:10:10AM +0100, Geert Uytterhoeven wrote:
> Hi Paul,
> 
> Thanks for your patch, which is now commit 0d49d9123dcf41f7 ("rcu:
> Allow up to five minutes expedited RCU CPU stall-warning timeouts")
> in next-20230109.
> 
> On Thu, Jan 5, 2023 at 2:10 AM Paul E. McKenney <paulmck@...nel.org> wrote:
> > The maximum value of RCU CPU stall-warning timeouts has historically been
> > five minutes (300 seconds).  However, the recently introduced expedited
> > RCU CPU stall-warning timeout is instead limited to 21 seconds.  This
> > causes problems for CI/fuzzing services such as syzkaller by obscuring
> > the issue in question with expedited RCU CPU stall-warning timeout splats.
> >
> > This commit therefore sets the RCU_EXP_CPU_STALL_TIMEOUT Kconfig options
> > upper bound to 300000 milliseconds, which is 300 seconds and 5 minutes.
> 
> s/and/or/

Good eyes!  I will apply with attribution on my next rebase.

							Thanx, Paul