linux-kernel - Re: [PATCH][RFC] ide: pdc202xxx_new: Remove do_gettimeofday() usage for ktime

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Date:	Wed, 07 Jan 2015 22:37:50 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	John Stultz <john.stultz@...aro.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>, linux-ide@...r.kernel.org
Subject: Re: [PATCH][RFC] ide: pdc202xxx_new: Remove do_gettimeofday() usage for ktime_get

On Wednesday 07 January 2015 13:01:33 John Stultz wrote:
> +       usec_elapsed = (long)ktime_to_ns(ktime_sub(end_time, start_time))/1000;
> 

This should use ktime_us_delta for brevity. Doing the 32-bit division that
you have here is probably slightly more efficient because it avoids do_div(),
but it's not performance critical.

	Arnd
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