linux-kernel - Re: [RFC][PATCH] Introduce CLOCK_REALTIME

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Date:	Sat, 18 Jul 2009 10:30:18 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	john stultz <johnstul@...ibm.com>
cc:	lkml <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...x.de>, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <ak@...e.de>, nikolag@...ibm.com,
	Darren Hart <dvhltc@...ibm.com>
Subject: Re: [RFC][PATCH] Introduce CLOCK_REALTIME_COARSE

On Fri, 17 Jul 2009, john stultz wrote:
> +static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec *tp)
> +{
> +	*tp = current_kernel_time();
> +	return 0;
> +}
> +
> +static int posix_get_monotonic_coarse(clockid_t which_clock,
> +						struct timespec *tp)
> +{
> +	*tp = get_monotonic_coarse();
> +	return 0;
> +}
> +
> +int posix_get_coarse_res(const clockid_t which_clock, struct timespec *tp)
> +{
> +	*tp = ktime_to_timespec(KTIME_LOW_RES);
> +	return 0;
> +}
>  /*
>   * Initialize everything, well, just everything in Posix clocks/timers ;)
>   */
> @@ -255,10 +274,24 @@ static __init int init_posix_timers(void)
>  		.clock_set = do_posix_clock_nosettime,
>  		.timer_create = no_timer_create,
>  	};
> +	struct k_clock clock_realtime_coarse = {
> +		.clock_getres = hrtimer_get_res,

  shouldn't that be posix_get_coarse_res ?

> +		.clock_get = posix_get_realtime_coarse,
> +		.clock_set = do_posix_clock_nosettime,
> +		.timer_create = no_timer_create,
> +	};
> +	struct k_clock clock_monotonic_coarse = {
> +		.clock_getres = hrtimer_get_res,

  ditto

> +		.clock_get = posix_get_monotonic_coarse,
> +		.clock_set = do_posix_clock_nosettime,
> +		.timer_create = no_timer_create,
> +	};

Looks good otherwise.

      tglx
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