netdev - Re: [PATCH 1/1] mISDN: Mark local variable 'incomplete' as __maybe_unused in dsp_pipeline

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Date:   Thu, 20 May 2021 09:24:06 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     Karsten Keil <isdn@...ux-pingi.de>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/1] mISDN: Mark local variable 'incomplete' as
 __maybe_unused in dsp_pipeline_build()



On 2021/5/20 9:09, Leizhen (ThunderTown) wrote:
> 
> 
> On 2021/5/19 23:45, Leon Romanovsky wrote:
>> On Wed, May 19, 2021 at 08:53:52PM +0800, Zhen Lei wrote:
>>> GCC reports the following warning with W=1:
>>>
>>> drivers/isdn/mISDN/dsp_pipeline.c:221:6: warning:
>>>  variable 'incomplete' set but not used [-Wunused-but-set-variable]
>>>   221 |  int incomplete = 0, found = 0;
>>>       |      ^~~~~~~~~~
>>>
>>> This variable is used only when macro PIPELINE_DEBUG is defined.
>>
>> That define is commented 13 years ago and can be seen as a dead code
>> that should be removed.
> 
> OK, I will remove it in V2. Actually, every time incomplete=1, a KERN_ERR message
> is printed in advance. The only new information is the 'cfg'.

Wow, Do you mean remove all "#ifdef PIPELINE_DEBUG" debug information? I will clean them.

> 
>>
>> Thanks
>>
>>>
>>> Reported-by: Hulk Robot <hulkci@...wei.com>
>>> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
>>> ---
>>>  drivers/isdn/mISDN/dsp_pipeline.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/isdn/mISDN/dsp_pipeline.c b/drivers/isdn/mISDN/dsp_pipeline.c
>>> index 40588692cec7..6a31f6879da8 100644
>>> --- a/drivers/isdn/mISDN/dsp_pipeline.c
>>> +++ b/drivers/isdn/mISDN/dsp_pipeline.c
>>> @@ -218,7 +218,7 @@ void dsp_pipeline_destroy(struct dsp_pipeline *pipeline)
>>>  
>>>  int dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg)
>>>  {
>>> -	int incomplete = 0, found = 0;
>>> +	int __maybe_unused incomplete = 0, found = 0;
>>>  	char *dup, *tok, *name, *args;
>>>  	struct dsp_element_entry *entry, *n;
>>>  	struct dsp_pipeline_entry *pipeline_entry;
>>> -- 
>>> 2.25.1
>>>
>>>
>>
>> .
>>