linux-kernel - Re: [PATCH v2] powerpc: booke_wdt: Fix build error as a module

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Message-ID: <CAJhHMCAnda9rL6zrK2a7w1vjx_TbtFCab_C25jYf+XYAPGxJeg@mail.gmail.com>
Date:	Wed, 20 Aug 2014 16:19:44 -0400
From:	Pranith Kumar <bobby.prani@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Wim Van Sebroeck <wim@...ana.be>,
	"open list:WATCHDOG DEVICE D..." <linux-watchdog@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] powerpc: booke_wdt: Fix build error as a module

On Wed, Aug 20, 2014 at 4:10 PM, Guenter Roeck <linux@...ck-us.net> wrote:
> On Wed, Aug 20, 2014 at 03:26:46PM -0400, Pranith Kumar wrote:
>> Building booke_wdt fails when trying to build as a module as there is no
>> early_param() in module. Fix by using module_param() instead of early_param().
>>
>> Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
>> CC: Guenter Roeck <linux@...ck-us.net>
>
> Looks good as far as I can see. One question though:
>
>> +MODULE_ALIAS("booke_wdt");
>
> Is this necessary ? If yes, shouldn't it be a separate patch to be applied
> to -stable ?

Suppose this was actually built as a module. How do you pass the
module parameters to this module? Only ways I know of are

./insmod booke_wdt booke_wdt_enabled=1 booke_wdt_period=3

or pass booke_wdt.booke_wdt_enabled=1 on the kernel boot params list.

So the alias is necessary to refer to this module to pass params.

About separate patch, I think it is only with conversion to
module_param() that we need this alias.

Am I missing something?

-- 
Pranith
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