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Subject: Re: [PATCH] soc: fsl: qe: remove unused function
To:     Daniel Axtens <dja@axtens.net>,
        Jiapeng Chong <jiapeng.chong@linux.alibaba.com>,
        qiang.zhao@nxp.com
Cc:     linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, leoyang.li@nxp.com
References: <1618475663-100748-1-git-send-email-jiapeng.chong@linux.alibaba.com>
 <87blaeg1ig.fsf@linkitivity.dja.id.au>
From:   Christophe Leroy <christophe.leroy@csgroup.eu>
Message-ID: <76468b5b-0eb0-8772-b7b5-21bb708aa053@csgroup.eu>
Date:   Fri, 16 Apr 2021 09:06:23 +0200
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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@linux.alibaba.com>
>> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.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@axtens.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