linux-kernel - Re: [PATCH] staging: imx-drm: Fix modular build of DRM_IMX

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Date:	Mon, 18 Nov 2013 10:03:10 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Josh Boyer <jwboyer@...hat.com>
Cc:	Philipp Zabel <p.zabel@...gutronix.de>,
	Dave Airlie <airlied@...il.com>, devel@...verdev.osuosl.org,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: imx-drm: Fix modular build of DRM_IMX_IPUV3

On Tue, Nov 12, 2013 at 12:15:45PM -0500, Josh Boyer wrote:
> commit b8d181e408af (staging: drm/imx: add drm plane support) added a file
> to the make target for DRM_IMX_IPUV3 but didn't adjust the objs required
> to actually build that as a module.  Kbuild got confused and this lead to
> link errors like:
> 
> ERROR: "ipu_plane_disable" [drivers/staging/imx-drm/ipuv3-crtc.ko] undefined!
> ERROR: "ipu_plane_enable" [drivers/staging/imx-drm/ipuv3-crtc.ko] undefined!
> 
> Additionally, it added a call to imx_drm_crtc_id which also fails with a
> link error as above.  To fix this, we adjust the make target with the proper
> objs, which will change the name of the resulting .ko.  We also add an
> EXPORT_SYMBOL_GPL for imx_drm_crtc_id.
> 
> Signed-off-by: Josh Boyer <jwboyer@...oraproject.org>


Acked-by: Sascha Hauer <s.hauer@...gutronix.de>

Sascha

> ---
>  drivers/staging/imx-drm/Makefile       | 4 +++-
>  drivers/staging/imx-drm/imx-drm-core.c | 1 +
>  2 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/imx-drm/Makefile b/drivers/staging/imx-drm/Makefile
> index 2c3a9e1..8742432 100644
> --- a/drivers/staging/imx-drm/Makefile
> +++ b/drivers/staging/imx-drm/Makefile
> @@ -8,4 +8,6 @@ obj-$(CONFIG_DRM_IMX_TVE) += imx-tve.o
>  obj-$(CONFIG_DRM_IMX_LDB) += imx-ldb.o
>  obj-$(CONFIG_DRM_IMX_FB_HELPER) += imx-fbdev.o
>  obj-$(CONFIG_DRM_IMX_IPUV3_CORE) += ipu-v3/
> -obj-$(CONFIG_DRM_IMX_IPUV3)	+= ipuv3-crtc.o ipuv3-plane.o
> +
> +imx-ipuv3-crtc-objs  := ipuv3-crtc.o ipuv3-plane.o
> +obj-$(CONFIG_DRM_IMX_IPUV3)	+= imx-ipuv3-crtc.o
> diff --git a/drivers/staging/imx-drm/imx-drm-core.c b/drivers/staging/imx-drm/imx-drm-core.c
> index 4483d47..2b366d8 100644
> --- a/drivers/staging/imx-drm/imx-drm-core.c
> +++ b/drivers/staging/imx-drm/imx-drm-core.c
> @@ -72,6 +72,7 @@ int imx_drm_crtc_id(struct imx_drm_crtc *crtc)
>  {
>  	return crtc->pipe;
>  }
> +EXPORT_SYMBOL_GPL(imx_drm_crtc_id);
>  
>  static void imx_drm_driver_lastclose(struct drm_device *drm)
>  {
> -- 
> 1.8.3.1
> 
> 

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