linux-kernel - Re: [RFC PATCH] block: slightly optimize blkdev

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Message-ID: <20090714140839.GA18146@cmpxchg.org>
Date:	Tue, 14 Jul 2009 16:08:39 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Xiaotian Feng <dfeng@...hat.com>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] block: slightly optimize blkdev_ioctl BLKRA{SET,GET}

On Tue, Jul 14, 2009 at 07:59:54PM +0800, Xiaotian Feng wrote:
> Slightly optimize blkdev_ioctl by using shift instead of multiply
> and divide.

Does it make an actual difference in the object code for you?  I don't
have a single multiplication in that function after compilation.

	Hannes
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