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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87blaeg1ig.fsf@linkitivity.dja.id.au>
Date:   Fri, 16 Apr 2021 16:57:27 +1000
From:   Daniel Axtens <dja@...ens.net>
To:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>, qiang.zhao@....com
Cc:     leoyang.li@....com, linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Subject: Re: [PATCH] soc: fsl: qe: remove unused function

Hi Jiapeng,

> Fix the following clang warning:
>
> drivers/soc/fsl/qe/qe_ic.c:234:29: warning: unused function
> 'qe_ic_from_irq' [-Wunused-function].
>
> 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