linux-kernel - Re: [patch 51/55] clocksource: Make delta calculation a function

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Date:	Tue, 15 Jul 2014 20:50:24 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [patch 51/55] clocksource: Make delta calculation a function

On Fri, Jul 11, 2014 at 6:45 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> @@ -335,16 +335,15 @@ static void timekeeping_update(struct ti
>   */
>  static void timekeeping_forward_now(struct timekeeper *tk)
>  {
> -       cycle_t cycle_now, cycle_delta;
> +       cycle_t cycle_now, delta;
>         struct clocksource *clock;
>         s64 nsec;
>
>         clock = tk->clock;
>         cycle_now = clock->read(clock);
> -       cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
> -       tk->cycle_last = clock->cycle_last = cycle_now;
> +       delta = clocksource_delta(cycle_now, clock->cycle_last, clock->mask);

Errr.. Was dropping the update to tk->cycle_last and clock->cycle_last
intended? That seems broken.

thanks
-john
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