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

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Message-ID: <4E38B8BD.10406@gmail.com>
Date:	Wed, 03 Aug 2011 10:55:57 +0800
From:	Wang Sheng-Hui <shhuiw@...il.com>
To:	Américo Wang <xiyou.wangcong@...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 2011年08月03日 10:52, Américo Wang wrote:
> 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

Got it. Thanks,

> 
> 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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