linux-kernel - Re: [PATCH 2:2][MTD][NAND]omap : Adding DMA mode support in nand prefetch/post-write

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Date:	Fri, 10 Jul 2009 13:40:21 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	dedekind@...radead.org
Cc:	vimal singh <vimalsingh@...com>, linux-mtd@...ts.infradead.org,
	Tony Lindgren <tony@...mide.com>, david-b@...bell.net,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH 2:2][MTD][NAND]omap : Adding DMA mode support in nand 
 prefetch/post-write

On Fri, 2009-07-10 at 15:02 +0300, Artem Bityutskiy wrote:
> On Fri, 2009-07-10 at 17:25 +0530, vimal singh wrote:
> > +	/* The fifo depth is 64 bytes. We have a sync at each frame and frame
> > +	 * length is 64 bytes.
> > +	 */
> > +	int buf_len = len/64;
> 
> To optimize performance it is better not to rely on gcc and use <<

If you ever see gcc screwing up division of an 'int' by a constant 64,
file a GCC bug.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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