linux-kernel - Re: [PATCH v6 06/25] timer: Export next wakeup time of a CPU

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Message-ID: <20180314171950.yn5spehwzuc5nttu@lakrids.cambridge.arm.com>
Date:   Wed, 14 Mar 2018 17:19:51 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
        linux-pm@...r.kernel.org, Kevin Hilman <khilman@...nel.org>,
        Lina Iyer <ilina@...eaurora.org>,
        Lina Iyer <lina.iyer@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Juri Lelli <juri.lelli@....com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 06/25] timer: Export next wakeup time of a CPU

On Wed, Mar 14, 2018 at 05:58:16PM +0100, Ulf Hansson wrote:
> @@ -132,6 +133,15 @@ static inline ktime_t tick_nohz_get_sleep_length(void)
>  {
>  	return NSEC_PER_SEC / HZ;
>  }
> +
> +static inline ktime_t tick_nohz_get_next_wakeup(int cpu)
> +{
> +	ktime_t len = NSEC_PER_SEC/HZ;
> +
> +	/* Next wake up is the tick period, assume it starts now */
> +	return ktime_add(len, ktime_get());
> +}

Thsi could be marginally simpler as:

static inline ktime_t tick_nohz_get_next_wakeup(int cpu)
{
	/* Next wake up is the tick period, assume it starts now */
	return ktime_add(tick_nohz_get_sleep_length(), ktime_get());
}

Thanks,
Mark.