linux-kernel - Re: [PATCH] drm/i915/gmch: avoid unused variable warning

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Date:   Mon, 12 Jun 2023 15:35:42 +0200
From:   Andi Shyti <andi.shyti@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Arnd Bergmann <arnd@...db.de>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915/gmch: avoid unused variable warning

Hi Arnd,

On Mon, Jun 12, 2023 at 02:43:59PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> When CONFIG_PNP is disabled, the mchbar_addr variable is only written but
> not read:
> 
> drivers/gpu/drm/i915/soc/intel_gmch.c: In function 'intel_alloc_mchbar_resource':
> drivers/gpu/drm/i915/soc/intel_gmch.c:41:13: error: variable 'mchbar_addr' set but not used [-Werror=unused-but-set-variable]
>    41 |         u64 mchbar_addr;
>       |             ^~~~~~~~~~~
> 
> No idea why this showed up now, but it's easy to fix by changing the #ifdef to
> an IS_ENABLED() check that the compiler can see through.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Andi Shyti <andi.shyti@...ux.intel.com>

Andi

> ---
> I saw this last week already, so it's likely that someone else already sent
> a fix for it.
> 
>  drivers/gpu/drm/i915/soc/intel_gmch.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/soc/intel_gmch.c b/drivers/gpu/drm/i915/soc/intel_gmch.c
> index 6d0204942f7a5..49c7fb16e934f 100644
> --- a/drivers/gpu/drm/i915/soc/intel_gmch.c
> +++ b/drivers/gpu/drm/i915/soc/intel_gmch.c
> @@ -47,11 +47,9 @@ intel_alloc_mchbar_resource(struct drm_i915_private *i915)
>  	mchbar_addr = ((u64)temp_hi << 32) | temp_lo;
>  
>  	/* If ACPI doesn't have it, assume we need to allocate it ourselves */
> -#ifdef CONFIG_PNP
> -	if (mchbar_addr &&
> +	if (IS_ENABLED(CONFIG_PNP) && mchbar_addr &&
>  	    pnp_range_reserved(mchbar_addr, mchbar_addr + MCHBAR_SIZE))
>  		return 0;
> -#endif
>  
>  	/* Get some space for it */
>  	i915->gmch.mch_res.name = "i915 MCHBAR";
> -- 
> 2.39.2
>