[Ocfs2-devel] [PATCH 2/6] ocfs2: o2hb: add NEGO_TIMEOUT message

[Junxiao Bi]

On 01/22/2016 01:45 PM, Andrew Morton wrote:
> On Fri, 22 Jan 2016 13:12:26 +0800 Junxiao Bi <junxiao.bi at oracle.com> wrote:
> 
>> On 01/22/2016 07:47 AM, Andrew Morton wrote:
>>> On Wed, 20 Jan 2016 11:13:35 +0800 Junxiao Bi <junxiao.bi at oracle.com> wrote:
>>>
>>>> This message is sent to master node when non-master nodes's
>>>> negotiate timer expired. Master node records these nodes in
>>>> a bitmap which is used to do write timeout timer re-queue
>>>> decision.
>>>>
>>>> ...
>>>>
>>>> +static int o2hb_nego_timeout_handler(struct o2net_msg *msg, u32 len, void *data,
>>>> +				void **ret_data)
>>>> +{
>>>> +	struct o2hb_region *reg = (struct o2hb_region *)data;
>>>
>>> It's best not to typecast a void*.  It's unneeded clutter and the cast
>>> can actually hide bugs - if someone changes `data' to a different type
>>> or if there's a different "data" in scope, etc.
>> There are many kinds of messages in ocfs2 and each one needs a different
>> type of "data", so it is made type void*.
> 
> What I mean is to do this:
> 
> 	struct o2hb_region *reg = data;
> 
> and not
> 
> 	struct o2hb_region *reg = (struct o2hb_region *)data;
> 
> Because the typecast is unneeded and is actually harmful.  Imagine if someone
> goofed and had `int data;': no warning, runtime failure.
Oh, I see. Thank you. Will update this in V2.

Thanks,
Junxiao.
>