linux-kernel - Re: [PATCH 1/9] syslog_ns: add syslog_namespace and put/get_syslog

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Date:	Mon, 29 Jul 2013 19:47:02 +0800
From:	Rui Xiang <rui.xiang@...wei.com>
To:	Gu Zheng <guz.fnst@...fujitsu.com>
CC:	<containers@...ts.linux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <serge.hallyn@...ntu.com>,
	<ebiederm@...ssion.com>, <akpm@...ux-foundation.org>,
	<gaofeng@...fujitsu.com>, <libo.chen@...wei.com>
Subject: Re: [PATCH 1/9] syslog_ns: add syslog_namespace and put/get_syslog_ns

On 2013/7/29 17:40, Gu Zheng wrote:
> Hi Rui,
> 	Refer to inline:).
> 
Hi Gu,

Thanks for your attention.

> On 07/29/2013 10:31 AM, Rui Xiang wrote:
> 
>> Add a struct syslog_namespace which contains the necessary
>> members for hanlding syslog and realize get_syslog_ns and
>> put_syslog_ns API.
>>
>> Signed-off-by: Rui Xiang <rui.xiang@...wei.com>
>> ---
>>  include/linux/syslog.h | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++
>>  kernel/printk.c        |  7 ------
>>  2 files changed, 68 insertions(+), 7 deletions(-)
>>

...

>> +
>> +static inline void free_syslog_ns(struct kref *kref)
>> +{
>> +	struct syslog_namespace *ns;
>> +	ns = container_of(kref, struct syslog_namespace, kref);
>> +
>> +	kfree(ns->log_buf);
>> +	kfree(ns);
>> +}
> 
> This interface seems a bit ugly, why not use the format like put_syslog_ns()?
> 
> static inline void free_syslog_ns(struct syslog_namespace *ns)
> 

Free_syslog_ns is used in put_syslog_ns. And the kref_put function uses kref as
a parameter for its relase funtion. You can see that from 
static inline int kref_put(struct kref *kref, void (*release)(struct kref *kref)).

Thanks.

>> +
>> +static inline void put_syslog_ns(struct syslog_namespace *ns)
>> +{
>> +	if (ns)
>> +		kref_put(&ns->kref, free_syslog_ns);
>> +}
>> +
>> 

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