linux-kernel - Re: [PATCH v2] davinci: vpif: Fix module build for capture and display

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Date:	Wed, 20 Mar 2013 10:49:40 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
Cc:	LMML <linux-media@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	Sekhar Nori <nsekhar@...com>
Subject: Re: [PATCH v2] davinci: vpif: Fix module build for capture and display

Hi Mauro,

On Wed, Mar 20, 2013 at 12:00 AM, Mauro Carvalho Chehab
<mchehab@...hat.com> wrote:
> Em Fri,  8 Mar 2013 16:19:07 +0530
> Prabhakar lad <prabhakar.csengg@...il.com> escreveu:
>
>> From: Lad, Prabhakar <prabhakar.csengg@...il.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.csengg@...il.com>
>> ---
>>  Changes for v2:
>>  1: use EXPORT_SYMBOL_GPL instead of EXPORT_SYMBOL() as pointed by
>>     Sekhar.
>>
>>  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..42c7eba 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_GPL(vpif_base);
>> +
>>  struct clk *vpif_clk;
>>
>>  /**
>> @@ -220,8 +222,10 @@ const struct vpif_channel_config_params ch_params[] = {
>>               .stdid = V4L2_STD_625_50,
>>       },
>>  };
>> +EXPORT_SYMBOL_GPL(ch_params);
>
> Please don't use simple names like that. It would be very easy that some
> other driver could try to declare the same symbol. Instead, prefix it
> with the driver name (vpif_ch_params).
>
Agreed, I'll respin a new version fixing it.

Cheers,
--Prabhakar

>>
>>  const unsigned int vpif_ch_params_count = ARRAY_SIZE(ch_params);
>> +EXPORT_SYMBOL_GPL(vpif_ch_params_count);
>>
>>  static inline void vpif_wr_bit(u32 reg, u32 bit, u32 val)
>>  {
>
> Regards,
> Mauro
--
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