linux-kernel - Re: [PATCH -next] PCI: rpaphp: remove set but not used variable 'value'

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Date:   Thu, 12 Mar 2020 09:38:00 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Chen Zhou <chenzhou10@...wei.com>
Cc:     paulus@...ba.org, mpe@...erman.id.au, tyreld@...ux.ibm.com,
        linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] PCI: rpaphp: remove set but not used variable
 'value'

On Thu, Mar 12, 2020 at 10:04:12PM +0800, Chen Zhou wrote:
> Fixes gcc '-Wunused-but-set-variable' warning:
> 
> drivers/pci/hotplug/rpaphp_core.c: In function is_php_type:
> drivers/pci/hotplug/rpaphp_core.c:291:16: warning:
> 	variable value set but not used [-Wunused-but-set-variable]
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Chen Zhou <chenzhou10@...wei.com>

Michael, if you want this:

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

If you don't mind, edit the subject to follow the convention, e.g.,

  PCI: rpaphp: Remove unused variable 'value'

Apparently simple_strtoul() is deprecated and we're supposed to use
kstrtoul() instead.  Looks like kstrtoul() might simplify the code a
little, too, e.g.,

  if (kstrtoul(drc_type, 0, &value) == 0)
    return 1;

  return 0;

> ---
>  drivers/pci/hotplug/rpaphp_core.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/hotplug/rpaphp_core.c b/drivers/pci/hotplug/rpaphp_core.c
> index e408e40..5d871ef 100644
> --- a/drivers/pci/hotplug/rpaphp_core.c
> +++ b/drivers/pci/hotplug/rpaphp_core.c
> @@ -288,11 +288,10 @@ EXPORT_SYMBOL_GPL(rpaphp_check_drc_props);
>  
>  static int is_php_type(char *drc_type)
>  {
> -	unsigned long value;
>  	char *endptr;
>  
>  	/* PCI Hotplug nodes have an integer for drc_type */
> -	value = simple_strtoul(drc_type, &endptr, 10);
> +	simple_strtoul(drc_type, &endptr, 10);
>  	if (endptr == drc_type)
>  		return 0;
>  
> -- 
> 2.7.4
>