From: Wang Sheng-Hui <shhuiw@gmail.com>
To: "Américo Wang" <xiyou.wangcong@gmail.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>, Theodore Ts'o <tytso@mit.edu>,
Jan Kara <jack@suse.cz>,
linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] jbd/jbd2: add pointer type conversion on void *arg from void * to journal_t * explicitly in kjournald/kjournald2
Date: Wed, 03 Aug 2011 10:55:57 +0800 [thread overview]
Message-ID: <4E38B8BD.10406@gmail.com> (raw)
In-Reply-To: <CAM_iQpXJSDvHXtGFET7SgQTXUpk-v+hD24RzSR-sanf=4oY1xA@mail.gmail.com>
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@gmail.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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WARNING: multiple messages have this Message-ID (diff)
From: Wang Sheng-Hui <shhuiw@gmail.com>
To: "Américo Wang" <xiyou.wangcong@gmail.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>, "Theodore Ts'o" <tytso@mit.edu>,
Jan Kara <jack@suse.cz>,
linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] jbd/jbd2: add pointer type conversion on void *arg from void * to journal_t * explicitly in kjournald/kjournald2
Date: Wed, 03 Aug 2011 10:55:57 +0800 [thread overview]
Message-ID: <4E38B8BD.10406@gmail.com> (raw)
In-Reply-To: <CAM_iQpXJSDvHXtGFET7SgQTXUpk-v+hD24RzSR-sanf=4oY1xA@mail.gmail.com>
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@gmail.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.
next prev parent reply other threads:[~2011-08-03 2:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-03 1:58 [PATCH] jbd/jbd2: add pointer type conversion on void *arg from void * to journal_t * explicitly in kjournald/kjournald2 Wang Sheng-Hui
2011-08-03 2:04 ` Li Zefan
2011-08-03 2:17 ` Wang Sheng-Hui
2011-08-03 2:17 ` Wang Sheng-Hui
2011-08-03 2:31 ` Li Zefan
2011-08-03 2:31 ` Li Zefan
2011-08-03 2:52 ` Américo Wang
2011-08-03 2:55 ` Wang Sheng-Hui [this message]
2011-08-03 2:55 ` Wang Sheng-Hui
2011-08-03 3:24 ` Arnaud Lacombe
2011-08-03 5:38 ` Jesper Juhl
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