linux-kernel - Re: [PATCH] drm/exynos: Fix build breakage on !DRM_EXYNOS

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Date:	Mon, 04 May 2015 16:43:53 +0900
From:	Inki Dae <inki.dae@...sung.com>
To:	Krzysztof Kozlowski <k.kozlowski.k@...il.com>
Cc:	Joonyoung Shim <jy0922.shim@...sung.com>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	David Airlie <airlied@...ux.ie>, Kukjin Kim <kgene@...nel.org>,
	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/exynos: Fix build breakage on !DRM_EXYNOS_FIMD

On 2015년 05월 02일 13:08, Krzysztof Kozlowski wrote:
> Selecting CONFIG_FB_S3C disables CONFIG_DRM_EXYNOS_FIMD leading to build
> error:

No, eDP has no any dependency of FIMD but DECON. Just add dependency
code like below,

 config DRM_EXYNOS7_DECON
        bool "Exynos DRM DECON"
-       depends on DRM_EXYNOS
+       depends on DRM_EXYNOS && !FB_S3C

> 
> drivers/built-in.o: In function `exynos_dp_dpms':
> binder.c:(.text+0xd6a840): undefined reference to `fimd_dp_clock_enable'
> binder.c:(.text+0xd6ab54): undefined reference to `fimd_dp_clock_enable'
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@...il.com>
> ---
>  drivers/gpu/drm/exynos/exynos_drm_fimd.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.h b/drivers/gpu/drm/exynos/exynos_drm_fimd.h
> index b4fcaa568456..db67f3d9786d 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.h
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.h
> @@ -10,6 +10,10 @@
>  #ifndef _EXYNOS_DRM_FIMD_H_
>  #define _EXYNOS_DRM_FIMD_H_
>  
> +#ifdef CONFIG_DRM_EXYNOS_FIMD
>  extern void fimd_dp_clock_enable(struct exynos_drm_crtc *crtc, bool enable);
> +#else
> +static inline void fimd_dp_clock_enable(struct exynos_drm_crtc *crtc, bool enable) {};
> +#endif

So above codes are unnecessary. It's really not good to add #ifdef ~ #endif.

Thanks,
Inki Dae

>  
>  #endif /* _EXYNOS_DRM_FIMD_H_ */
> 

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