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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1247229621.29541.4.camel@macbook.infradead.org>
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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/