From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 3/3] Add timeout feature
Date: Sun, 29 Jun 2008 17:01:52 -0700
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To: "Takashi Sato" <t-sato@yk.jp.nec.com>
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On Mon, 30 Jun 2008 08:13:07 +0900 "Takashi Sato" <t-sato@yk.jp.nec.com> wrote:

> > It's much better to use NULL here rather than literal zero because the
> > reader of this code can then say "ah-hah, we're passing in a pointer". 
> > Whereas plain old "0" could be a pointer or a scalar.
> 
> The second argument's type of freeze_bdev() is "long", not pointer as below.
> struct super_block *freeze_bdev(struct block_device *, long timeout_msec);

oh, ok, I goofed, sorry.

> So "0" is reasonable, isn't it?

yup.