linux-kernel - Re: [PATCH 2/4] cpuidle: menu: Use ktime_to

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Date:	Wed, 06 Aug 2014 16:17:36 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Mel Gorman <mgorman@...e.de>,
	Rafael J Wysocki <rafael.j.wysocki@...el.com>,
	Nicolas Pitre <nico@...aro.org>
CC:	Mike Galbraith <mgalbraith@...e.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] cpuidle: menu: Use ktime_to_us instead of reinventing
 the wheel

On 08/06/2014 03:19 PM, Mel Gorman wrote:
> The ktime_to_us implementation is slightly better than the one implemented
> in menu.c. Use it
>
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>

> ---
>   drivers/cpuidle/governors/menu.c | 5 +----
>   1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
> index 801b2ee..373278a 100644
> --- a/drivers/cpuidle/governors/menu.c
> +++ b/drivers/cpuidle/governors/menu.c
> @@ -297,7 +297,6 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
>   	int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
>   	int i;
>   	unsigned int interactivity_req;
> -	struct timespec t;
>
>   	if (data->needs_update) {
>   		menu_update(drv, dev);
> @@ -311,9 +310,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
>   		return 0;
>
>   	/* determine the expected residency time, round up */
> -	t = ktime_to_timespec(tick_nohz_get_sleep_length());
> -	data->next_timer_us =
> -		t.tv_sec * USEC_PER_SEC + t.tv_nsec / NSEC_PER_USEC;
> +	data->next_timer_us = ktime_to_us(tick_nohz_get_sleep_length());
>
>
>   	data->bucket = which_bucket(data->next_timer_us);
>


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