linux-kernel - Re: [PATCH] topology: Fix up build warning in topology_is

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Message-ID: <YmPajtfsCL8Idw4h@kroah.com>
Date:   Sat, 23 Apr 2022 12:53:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH] topology: Fix up build warning in topology_is_visible()

On Fri, Apr 22, 2022 at 08:26:53AM +0200, Greg Kroah-Hartman wrote:
> Commit aa63a74d4535 ("topology/sysfs: Hide PPIN on systems that do not
> support it.") caused a build warning on some configurations:
> 
> drivers/base/topology.c: In function 'topology_is_visible':
> drivers/base/topology.c:158:24: warning: unused variable 'dev' [-Wunused-variable]
>   158 |         struct device *dev = kobj_to_dev(kobj);
> 
> Fix this up by getting rid of the variable entirely.
> 
> Fixes: aa63a74d4535 ("topology/sysfs: Hide PPIN on systems that do not support it.")
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Cc: Tony Luck <tony.luck@...el.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/base/topology.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/base/topology.c b/drivers/base/topology.c
> index 706dbf8bf249..ac6ad9ab67f9 100644
> --- a/drivers/base/topology.c
> +++ b/drivers/base/topology.c
> @@ -155,9 +155,7 @@ static struct attribute *default_attrs[] = {
>  static umode_t topology_is_visible(struct kobject *kobj,
>  				   struct attribute *attr, int unused)
>  {
> -	struct device *dev = kobj_to_dev(kobj);
> -
> -	if (attr == &dev_attr_ppin.attr && !topology_ppin(dev->id))
> +	if (attr == &dev_attr_ppin.attr && !topology_ppin(kobj_to_dev(kobj)->id))
>  		return 0;
>  
>  	return attr->mode;
> -- 
> 2.36.0
> 

Given no comments that this is a bad idea, I'll go apply this now.

thanks,

greg k-h