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

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Date:	Wed, 03 Aug 2011 10:31:13 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Wang Sheng-Hui <shhuiw@...il.com>
CC:	"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

Wang Sheng-Hui wrote:
> On 2011年08月03日 10:04, Li Zefan wrote:
>> 09:58, Wang Sheng-Hui wrote:
>>> The patch is against 3.0
>>>
>>> The arg of kjournald/kjournald2 is void *, and points to type
>>> journal_t. We should convert it to journal_t * explicitly in
>>> the kjournald/kjournald2 function body.
>>>
>>
>> Why?
>>
>> Implicit convertion from void * to foo * is ok. Did the compiler
>> complain about this to you?
> 
> I remember any * can be assigned directly to void * in ANSI C, but
> void * should be converted to specific point * type. Right?
> 

No.

> And I checked the code of kswapd, in which explicitly conversion is
> taken on the arg *. I think it should do so in journal.c too.
> 

Please check more similar code.
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