From: Arnd Bergmann <arnd@arndb.de>
To: John Stultz <john.stultz@linaro.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
linux-ide@vger.kernel.org
Subject: Re: [PATCH][RFC] ide: pdc202xxx_new: Remove do_gettimeofday() usage for ktime_get
Date: Wed, 07 Jan 2015 22:37:50 +0100 [thread overview]
Message-ID: <1721240.TWtHUuoOhJ@wuerfel> (raw)
In-Reply-To: <1420664493-7041-1-git-send-email-john.stultz@linaro.org>
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
prev parent reply other threads:[~2015-01-07 21:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-07 21:01 [PATCH][RFC] ide: pdc202xxx_new: Remove do_gettimeofday() usage for ktime_get John Stultz
2015-01-07 21:37 ` Arnd Bergmann [this message]
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