From: Frederic Weisbecker <frederic@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
Marco Elver <elver@google.com>,
kasan-dev <kasan-dev@googlegroups.com>,
Peter Zijlstra <peterz@infradead.org>,
"Paul E. McKenney" <paulmck@kernel.org>,
Ingo Molnar <mingo@kernel.org>, Will Deacon <will@kernel.org>,
Naresh Kamboju <naresh.kamboju@linaro.org>
Subject: Re: [patch 2/3] tick/sched: Remove bogus boot "safety" check
Date: Fri, 11 Dec 2020 23:41:01 +0100 [thread overview]
Message-ID: <20201211224101.GD595642@lothringen> (raw)
In-Reply-To: <20201206212002.725238293@linutronix.de>
On Sun, Dec 06, 2020 at 10:12:55PM +0100, Thomas Gleixner wrote:
> can_stop_idle_tick() checks whether the do_timer() duty has been taken over
> by a CPU on boot. That's silly because the boot CPU always takes over with
> the initial clockevent device.
>
> But even if no CPU would have installed a clockevent and taken over the
> duty then the question whether the tick on the current CPU can be stopped
> or not is moot. In that case the current CPU would have no clockevent
> either, so there would be nothing to keep ticking.
>
> Remove it.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Thanks!
next prev parent reply other threads:[~2020-12-11 23:31 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-06 21:12 [patch 0/3] tick: Annotate and document the intentionaly racy tick_do_timer_cpu Thomas Gleixner
2020-12-06 21:12 ` [patch 1/3] tick: Remove pointless cpu valid check in hotplug code Thomas Gleixner
2020-12-07 11:59 ` Peter Zijlstra
2020-12-07 17:44 ` Thomas Gleixner
2020-12-11 22:21 ` Frederic Weisbecker
2020-12-12 0:16 ` Thomas Gleixner
2020-12-12 1:20 ` Frederic Weisbecker
2020-12-11 22:31 ` Frederic Weisbecker
2020-12-16 10:50 ` [tip: timers/urgent] " tip-bot2 for Thomas Gleixner
2020-12-06 21:12 ` [patch 2/3] tick/sched: Remove bogus boot "safety" check Thomas Gleixner
2020-12-11 22:41 ` Frederic Weisbecker [this message]
2020-12-16 10:50 ` [tip: timers/urgent] " tip-bot2 for Thomas Gleixner
2020-12-06 21:12 ` [patch 3/3] tick: Annotate tick_do_timer_cpu data races Thomas Gleixner
2020-12-07 12:09 ` Peter Zijlstra
2020-12-07 17:46 ` Thomas Gleixner
2020-12-07 18:19 ` Marco Elver
2020-12-07 19:43 ` Thomas Gleixner
2020-12-07 19:44 ` Paul E. McKenney
2020-12-07 21:46 ` Thomas Gleixner
2020-12-07 22:38 ` Paul E. McKenney
2020-12-07 22:46 ` Thomas Gleixner
2020-12-07 22:55 ` Paul E. McKenney
2020-12-08 8:11 ` Peter Zijlstra
2020-12-08 15:03 ` Paul E. McKenney
2020-12-16 0:27 ` Thomas Gleixner
2020-12-16 21:19 ` Paul E. McKenney
2020-12-16 21:23 ` Thomas Gleixner
2020-12-16 21:32 ` Paul E. McKenney
2020-12-17 10:48 ` Peter Zijlstra
2020-12-17 14:59 ` Paul E. McKenney
2020-12-08 8:01 ` Peter Zijlstra
2020-12-07 11:05 ` [patch 0/3] tick: Annotate and document the intentionaly racy tick_do_timer_cpu Marco Elver
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