linux-kernel - Re: [PATCH 02/10] mach-u300: rewrite gpio driver, move to drivers/gpio

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Message-ID: <BANLkTinABWucqESqSRYJV+-frm6vDmpxFQ@mail.gmail.com>
Date:	Thu, 19 May 2011 15:17:35 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Barry Song <21cnbao@...il.com>
Cc:	Linus Walleij <linus.walleij@...ricsson.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Lee Jones <lee.jones@...aro.org>,
	Jonas Aaberg <jonas.aberg@...ricsson.com>
Subject: Re: [PATCH 02/10] mach-u300: rewrite gpio driver, move to drivers/gpio

On Thu, May 19, 2011 at 2:35 PM, Barry Song <21cnbao@...il.com> wrote:
> 2011/5/19 Linus Walleij <linus.walleij@...aro.org>:
>> On Thu, May 19, 2011 at 1:38 PM, Barry Song <21cnbao@...il.com> wrote:
>>>
>>> looks like the driver can't be a real module, is the module_exit
>>> suitable? it looks strange module_exit plays together with
>>> arch_initcall.
>>
>> It's a rather common design pattern in the kernel for early
>> platform drivers. Either the dependencies are resolved by the
>> different initlevels or they are resolved in probe order with
>> loadable modules. Module load will call all initlevels in order.
>>
>> It is not elegant but it is common.
>
> Linus, thanks for your reply. module_exit and related functions are
> really useless codes. but people have done that before, then we have
> no way except following.
> u300_gpio_exit never gets chance to run and when we disassemble
> vmlinux, u300_gpio_exit()  function should be not in the final binary
> at all, just a symbol name is left.

I know. I can make the Kconfig options tristate if it makes you feel
better...

Linus Walleij
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