linux-kernel - Re: [PATCH] davinci: vpif: Fix module build for capture and display

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Date:	Fri, 8 Mar 2013 14:53:01 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Prabhakar lad <prabhakar.csengg@...il.com>
CC:	LMML <linux-media@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	"Lad, Prabhakar" <prabhakar.lad@...com>
Subject: Re: [PATCH] davinci: vpif: Fix module build for capture and display

Hi Prabhakar,

On 3/7/2013 12:44 PM, Prabhakar lad wrote:
> From: Lad, Prabhakar <prabhakar.lad@...com>
> 
> export the symbols which are used by two modules vpif_capture and
> vpif_display.
> 
> This patch fixes following error:
> ERROR: "ch_params" [drivers/media/platform/davinci/vpif_display.ko] undefined!
> ERROR: "vpif_ch_params_count" [drivers/media/platform/davinci/vpif_display.ko] undefined!
> ERROR: "vpif_base" [drivers/media/platform/davinci/vpif_display.ko] undefined!
> ERROR: "ch_params" [drivers/media/platform/davinci/vpif_capture.ko] undefined!
> ERROR: "vpif_ch_params_count" [drivers/media/platform/davinci/vpif_capture.ko] undefined!
> ERROR: "vpif_base" [drivers/media/platform/davinci/vpif_capture.ko] undefined!
> make[1]: *** [__modpost] Error 1
> 
> Reported-by: Sekhar Nori <nsekhar@...com>
> Signed-off-by: Lad, Prabhakar <prabhakar.lad@...com>
> ---
>  drivers/media/platform/davinci/vpif.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
> index 28638a8..8fbb4a2 100644
> --- a/drivers/media/platform/davinci/vpif.c
> +++ b/drivers/media/platform/davinci/vpif.c
> @@ -44,6 +44,8 @@ static struct resource	*res;
>  spinlock_t vpif_lock;
>  
>  void __iomem *vpif_base;
> +EXPORT_SYMBOL(vpif_base);

Should be EXPORT_SYMBOL_GPL() as nothing except GPL code would be
needing this internal symbol.

Also exporting this shows that the driver is written for only one
instance. It seems to me that the driver modules can use much better
abstractions so all these exports wont be needed but having broken
module build is bad as well.

Thanks,
Sekhar
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