linux-kernel - Re: [PATCH] drm/i915/gmch: fix build error var set but not used

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Message-ID: <87sf8rq94g.fsf@intel.com>
Date:   Thu, 10 Aug 2023 17:12:31 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Wang Jinchao <wangjinchao@...sion.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>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     stone.xulei@...sion.com
Subject: Re: [PATCH] drm/i915/gmch: fix build error var set but not used

On Thu, 10 Aug 2023, Wang Jinchao <wangjinchao@...sion.com> wrote:
> When CONFIG_PNP is not defined, i915 will fail to compile with error bellow:
> 	drivers/gpu/drm/i915/soc/intel_gmch.c:43:13: error: variable ‘mchbar_addr’ set but not used
> Fix it by surrounding variable declaration and assignment with ifdef
>
> Signed-off-by: Wang Jinchao <wangjinchao@...sion.com>

Thanks for the patch, but this was fixed a couple of months ago by
commit b02a9a0c6cb3 ("drm/i915/gmch: avoid unused variable warning").

Please check the development trees or linux-next before sending fixes.

Thanks,
Jani.


> ---
>  drivers/gpu/drm/i915/soc/intel_gmch.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/soc/intel_gmch.c b/drivers/gpu/drm/i915/soc/intel_gmch.c
> index 6d0204942f7a..d2c442b0b4eb 100644
> --- a/drivers/gpu/drm/i915/soc/intel_gmch.c
> +++ b/drivers/gpu/drm/i915/soc/intel_gmch.c
> @@ -38,16 +38,17 @@ intel_alloc_mchbar_resource(struct drm_i915_private *i915)
>  {
>  	int reg = GRAPHICS_VER(i915) >= 4 ? MCHBAR_I965 : MCHBAR_I915;
>  	u32 temp_lo, temp_hi = 0;
> -	u64 mchbar_addr;
>  	int ret;
> -
> +#ifdef CONFIG_PNP
> +	u64 mchbar_addr;
> +#endif
>  	if (GRAPHICS_VER(i915) >= 4)
>  		pci_read_config_dword(i915->gmch.pdev, reg + 4, &temp_hi);
>  	pci_read_config_dword(i915->gmch.pdev, reg, &temp_lo);
> -	mchbar_addr = ((u64)temp_hi << 32) | temp_lo;
>  
>  	/* If ACPI doesn't have it, assume we need to allocate it ourselves */
>  #ifdef CONFIG_PNP
> +	mchbar_addr = ((u64)temp_hi << 32) | temp_lo;
>  	if (mchbar_addr &&
>  	    pnp_range_reserved(mchbar_addr, mchbar_addr + MCHBAR_SIZE))
>  		return 0;

-- 
Jani Nikula, Intel Open Source Graphics Center