linux-kernel - Re: [PATCH 2/3] spufs: fix another off-by-one bug in mbox

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Message-Id: <200610242107.44115.arnd@arndb.de>
Date:	Tue, 24 Oct 2006 21:07:43 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	"Pekka Enberg" <penberg@...helsinki.fi>
Cc:	"Paul Mackerras" <paulus@...ba.org>, linuxppc-dev@...abs.org,
	cbe-oss-dev@...abs.org, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 2/3] spufs: fix another off-by-one bug in mbox_read

On Tuesday 24 October 2006 20:42, Pekka Enberg wrote:
> On 10/24/06, Arnd Bergmann <arnd@...db.de> wrote:
> >         spu_acquire(ctx);
> > -       for (count = 0; count <= len; count += 4, udata++) {
> > +       for (count = 0; (count + 4) <= len; count += 4, udata++) {
>
> Wouldn't this be more obvious as
>
>   for (count = 0, count < (len / 4); count++, udata++) {
>
> And then do count * 4 if you need the actual index somewhere. Hmm?

Count is the return value from a write() file operation. I find it
more readable to update that every time I do one put_user(), to
the exact value, than calculating the return code later.

	Arnd <>< 
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