linux-kernel - Re: [PATCH] clk: export __clk_get

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Date:	Sun, 19 Jan 2014 23:47:01 -0800
From:	Mike Turquette <mturquette@...aro.org>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	SeongJae Park <sj38.park@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: export __clk_get_hw for re-use in others

On Sun, Jan 19, 2014 at 9:37 AM, Greg KH <gregkh@...uxfoundation.org> wrote:
> On Sun, Jan 19, 2014 at 02:55:07PM +0900, SeongJae Park wrote:
>> Following build comes while modprobe process:
>> > ERROR: "__clk_get_hw" [drivers/clk/clk-max77686.ko] undefined!
>> > make[2]: *** [__modpost] Error 1
>> > make[1]: *** [modules] Error 2
>>
>> Export the symbol to fix it and for other part's usecase.
>>
>> Signed-off-by: SeongJae Park <sj38.park@...il.com>
>> ---
>>  drivers/clk/clk.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
>> index 2b38dc9..3883fba 100644
>> --- a/drivers/clk/clk.c
>> +++ b/drivers/clk/clk.c
>> @@ -575,6 +575,7 @@ struct clk_hw *__clk_get_hw(struct clk *clk)
>>  {
>>       return !clk ? NULL : clk->hw;
>>  }
>> +EXPORT_SYMBOL_GPL(__clk_get_hw);
>
> __ functions should usually only be for "internal" use, why does this
> get exported to modules?  Why not just put it in a .h file?

It was originally used only within the clock core but it is sensible
for hardware-specific clock drivers to use this as well. I plan to
audit all of the double-underscore functions in
include/linux/clk-provider.h for 3.15.

Regards,
Mike

>
> greg k-h
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