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

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Message-ID: <alpine.LNX.2.00.1108030737020.4521@swampdragon.chaosbits.net>
Date:	Wed, 3 Aug 2011 07:38:43 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	Li Zefan <lizf@...fujitsu.com>
cc:	Wang Sheng-Hui <shhuiw@...il.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, 3 Aug 2011, 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?
> 

Not only is it perfectly OK to rely on the implicit conversion, a lot of 
work has gone into actively removing such unneeded explicit casts over the 
years, so let's not introduce new ones.

-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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