linux-kernel - Re: [patch 2/8] hrtimer: Force clock_was_set() handling for the HIGHRES=n, NOHZ=y case

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Date:   Wed, 12 May 2021 18:40:49 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Peter Xu <peterx@...hat.com>,
        Nitesh Narayan Lal <nitesh@...hat.com>,
        Alex Belits <abelits@...vell.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        John Stultz <john.stultz@...aro.org>
Subject: Re: [patch 2/8] hrtimer: Force clock_was_set() handling for the HIGHRES=n, NOHZ=y case

On Wed, May 12 2021 at 16:59, Peter Zijlstra wrote:
> On Tue, Apr 27, 2021 at 10:25:39AM +0200, Thomas Gleixner wrote:
>>  void clock_was_set(void)
>>  {
>> +	if (!hrtimer_hres_active() && !tick_nohz_active)
>> +		goto out_timerfd;
>> +
>>  	/* Retrigger the CPU local events everywhere */
>>  	on_each_cpu(retrigger_next_event, NULL, 1);
>> +
>> +out_timerfd:
>>  	timerfd_clock_was_set();
>>  }
>
> Isn't that simpler when written like:
>
> 	if (hrtimer_hres_active() || tick_nohz_active())
> 		on_each_cpu(retrigger_next_event, NULL, 1);
>
> 	timerfd_clock_was_set();
>
> ?

Yes, but look at the later patches. Then we'll introduce it there. :)