linux-kernel - Re: [PATCH -tip 5/5] tracing: simplify memory recycle of trace_define

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Message-ID: <4B84E2B7.1070901@cn.fujitsu.com>
Date:	Wed, 24 Feb 2010 16:26:31 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	wenji.huang@...cle.com
CC:	linux-kernel@...r.kernel.org, fweisbec@...il.com,
	rostedt@...dmis.org
Subject: Re: [PATCH -tip 5/5] tracing: simplify memory recycle of trace_define_field

Wenji Huang wrote:
> On 02/24/2010 04:04 PM, Li Zefan wrote:
>> Wenji Huang wrote:
>>> Discard freeing field->type since it's not necessary and may be hazard.
>>>
>>
>> It's redundant, but it's safe, because if we run into this failure path,
>> field->type is always NULL.
> 
> There are two entries to failure path, field->name == NULL or
> field->type == NULL. And allocating for field->name is before field->type.
> 
> IMHO, field->type is not fixed after initialization, it's
> not safe if field->name==NULL goes to failure path.
> 

It's still safe, because field is allocated using kzalloc(). ;)

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