linux-kernel - Re: [GIT PULL] iscsi-target merge for v3.1-rc1

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Date:	Tue, 26 Jul 2011 12:08:04 +0200
From:	Olivier Galibert <galibert@...ox.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	target-devel <target-devel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>,
	Andy Grover <agrover@...hat.com>,
	Hannes Reinecke <hare@...e.de>,
	Roland Dreier <roland@...estorage.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Boaz Harrosh <openosd@...il.com>,
	Mike Christie <michaelc@...wisc.edu>
Subject: Re: [GIT PULL] iscsi-target merge for v3.1-rc1

On Tue, Jul 26, 2011 at 12:09:40AM -0700, Linus Torvalds wrote:
> And it just looks unnecessarily complicated. Just a simple
> 
> #define DIV_ROUND_UP_ULL(ll,d) \
>   ({ unsigned long long _tmp = (ll)+(d)-1; do_div(_tmp, d); _tmp; })
> 
> looks like it would work and be simpler. Avoid the conditional, do the
> same "add 'd-1' thing as the regular ROUND_UP().
> 
> Untested. And not much thinking involved.

Overflow risk?  Of course DIV_ROUND_UP has the same issue, and looks
slight easier to trigger, maybe.

  OG.

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