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 10:17:38 +0800
From:	Wang Sheng-Hui <shhuiw@...il.com>
To:	Li Zefan <lizf@...fujitsu.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

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?

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.

> 
>> Signed-off-by: Wang Sheng-Hui <shhuiw@...il.com>
>> ---
>>  fs/jbd/journal.c  |    2 +-
>>  fs/jbd2/journal.c |    2 +-
>>  2 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
>> index e2d4285..32956fd 100644
>> --- a/fs/jbd/journal.c
>> +++ b/fs/jbd/journal.c
>> @@ -116,7 +116,7 @@ static void commit_timeout(unsigned long __data)
>>  
>>  static int kjournald(void *arg)
>>  {
>> -	journal_t *journal = arg;
>> +	journal_t *journal = (journal_t *)arg;
>>  	transaction_t *transaction;
>>  
>>  	/*
>> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
>> index 0dfa5b5..c4f4bfc 100644
>> --- a/fs/jbd2/journal.c
>> +++ b/fs/jbd2/journal.c
>> @@ -129,7 +129,7 @@ static void commit_timeout(unsigned long __data)
>>  
>>  static int kjournald2(void *arg)
>>  {
>> -	journal_t *journal = arg;
>> +	journal_t *journal = (journal_t *)arg;
>>  	transaction_t *transaction;
>>  
>>  	/*

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