linux-ext4 - Re: [PATCH] jbd/jbd2: add pointer type conversion on void *arg from void * to journal

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Message-ID: <CAM_iQpXJSDvHXtGFET7SgQTXUpk-v+hD24RzSR-sanf=4oY1xA@mail.gmail.com>
Date:	Wed, 3 Aug 2011 10:52:47 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Wang Sheng-Hui <shhuiw@...il.com>
Cc:	Li Zefan <lizf@...fujitsu.com>, "Theodore Ts'o" <tytso@....edu>,
	Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] jbd/jbd2: add pointer type conversion on void *arg from
 void * to journal_t * explicitly in kjournald/kjournald2

On Wed, Aug 3, 2011 at 10:17 AM, Wang Sheng-Hui <shhuiw@...il.com> wrote:
>
> I remember any * can be assigned directly to void * in ANSI C, but
> void * should be converted to specific point * type. Right?
>

C99 6.3.2.3

A pointer to void may be converted to or from a pointer to any
incomplete or object
type. A pointer to any incomplete or object type may be converted to a
pointer to void
and back again; the result shall compare equal to the original pointer.
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