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

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Message-ID: <20200312144157.GA110750@google.com>
Date:   Thu, 12 Mar 2020 09:41:57 -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 09:38:02AM -0500, Bjorn Helgaas wrote:
> 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;

I guess there are several other uses of simple_strtoul() in this file.
Not sure if it's worth changing them all, just this one, or just the
patch below as-is.

> > ---
> >  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
> >