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

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Date:	Fri, 8 Mar 2013 14:56:49 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Sekhar Nori <nsekhar@...com>
Cc:	LMML <linux-media@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>
Subject: Re: [PATCH] davinci: vpif: Fix module build for capture and display

Sekhar,

On Fri, Mar 8, 2013 at 2:53 PM, Sekhar Nori <nsekhar@...com> wrote:
> 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.
>
OK as of now I'll go with EXPORT_SYMBOL_GPL() and revisit this at later
point of time.

Regards,
--Prabhakar

> Thanks,
> Sekhar
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