linux-kernel - Re: [PATCH] soc: fsl: qe: remove unused function

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Date:   Wed, 21 Apr 2021 15:56:09 +0800
From:   Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] soc: fsl: qe: remove unused function

On 2021/4/16 15:06, Christophe Leroy wrote:
> 
> 
> Le 16/04/2021 à 08:57, Daniel Axtens a écrit :
>> Hi Jiapeng,
>>
>>> Fix the following clang warning:
> 
> You are not fixing a warning, you are removing a function in order to 
> fix a warning ...
> 
>>>
>>> drivers/soc/fsl/qe/qe_ic.c:234:29: warning: unused function
>>> 'qe_ic_from_irq' [-Wunused-function].
> 
> Would be wise to tell that the last users of the function where removed 
> by commit d7c2878cfcfa ("soc: fsl: qe: remove unused qe_ic_set_* 
> functions")
> 
> https://github.com/torvalds/linux/commit/d7c2878cfcfa
> 
>>>
>>> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
>>> Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
>>> ---
>>>   drivers/soc/fsl/qe/qe_ic.c | 5 -----
>>>   1 file changed, 5 deletions(-)
>>>
>>> diff --git a/drivers/soc/fsl/qe/qe_ic.c b/drivers/soc/fsl/qe/qe_ic.c
>>> index 0390af9..b573712 100644
>>> --- a/drivers/soc/fsl/qe/qe_ic.c
>>> +++ b/drivers/soc/fsl/qe/qe_ic.c
>>> @@ -231,11 +231,6 @@ static inline void qe_ic_write(__be32  __iomem 
>>> *base, unsigned int reg,
>>>       qe_iowrite32be(value, base + (reg >> 2));
>>>   }
>>> -static inline struct qe_ic *qe_ic_from_irq(unsigned int virq)
>>> -{
>>> -    return irq_get_chip_data(virq);
>>> -}
>>
>> This seems good to me.
>>
>>   * We know that this function can't be called directly from outside the
>>    file, because it is static.
>>
>>   * The function address isn't used as a function pointer anywhere, so
>>     that means it can't be called from outside the file that way (also
>>     it's inline, which would make using a function pointer unwise!)
>>
>>   * There's no obvious macros in that file that might construct the name
>>     of the function in a way that is hidden from grep.
>>
>> All in all, I am fairly confident that the function is indeed not used.
>>
>> Reviewed-by: Daniel Axtens <dja@...ens.net>
>>
>> Kind regards,
>> Daniel
>>
>>> -
>>>   static inline struct qe_ic *qe_ic_from_irq_data(struct irq_data *d)
>>>   {
>>>       return irq_data_get_irq_chip_data(d);
>>> -- 
>>> 1.8.3.1
Hi,
I will follow the advice and send V2 later.