linux-kernel - Re: [Intel-gfx] [PATCH] i915: avoid unused-but-set-variable warning

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Date:   Mon, 26 Jun 2023 10:09:15 +0200
From:   Andi Shyti <andi.shyti@...ux.intel.com>
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>,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: Re: [Intel-gfx] [PATCH] i915: avoid unused-but-set-variable warning

Hi Arnd,

On Thu, Jun 22, 2023 at 12:18:41PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The mchbar_addr variable is only used inside of an #ifdef:
> 
> drivers/gpu/drm/i915/soc/intel_gmch.c:41:6: error: variable 'mchbar_addr' set but not used [-Werror,-Wunused-but-set-variable]
> 
> Change this to an IS_ENABLED() check to let the compiler see how
> it's used and no longer warn about it.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  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

you actually already sent this same patch[*] and I did push it in
drm-intel-next.

Andi

[*] https://patchwork.freedesktop.org/patch/542054/

>  
>  	/* Get some space for it */
>  	i915->gmch.mch_res.name = "i915 MCHBAR";
> -- 
> 2.39.2