linux-kernel - Re: [PATCH] [RFC] irqchip or mfd/tps65217: fix link error

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Date:   Wed, 14 Sep 2016 17:09:35 +0200
From:   Marcin Niestroj <m.niestroj@...nn-global.com>
To:     Arnd Bergmann <arnd@...db.de>, Thomas Gleixner <tglx@...utronix.de>
Cc:     Lee Jones <lee.jones@...aro.org>, "Andrew F. Davis" <afd@...com>,
        Marc Zyngier <marc.zyngier@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-kernel@...r.kernel.org,
        Grygorii Strashko <grygorii.strashko@...com>,
        Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH] [RFC] irqchip or mfd/tps65217: fix link error

On 14.09.2016 15:56, Arnd Bergmann wrote:
> On Wednesday, September 14, 2016 11:31:17 AM CEST Thomas Gleixner wrote:
>> On Wed, 14 Sep 2016, Arnd Bergmann wrote:
>>> Building tps65217 as a loadable module (as done in allmodconfig)
>>> now fails after we started calling irq_set_parent():
>>>
>>>   ERROR: "irq_set_parent" [drivers/mfd/tps65217.ko] undefined!
>>>
>>> The two obvious workarounds are either to force the driver
>>> to be built-in, or to make that symbol exported to modules.
>>>
>>> As it's not clear to me if either of them would be acceptable,
>>> I'm sending both of them here, please comment on which one
>>> you want to have, or whether the driver should handle this
>>> differently and not call irq_set_parent() at all.
>>
>> The question is why it needs to call that. But if it's justified, then I'm
>> not opposed to export it.
>
> Ok. I just noticed that I forgot to put the right people on Cc
> that worked on the patch originally, fixed that now.
>
> My other approach of making the symbol "bool" in the meantime has
> caused another problem when CONFIG_I2C=m:
>
> drivers/mfd/tps65217.o: In function `tps65217_init':
> tps65217.c:(.init.text+0x8): undefined reference to `i2c_register_driver'
> drivers/mfd/tps65217.o: In function `tps65217_probe':
> tps65217.c:(.text.tps65217_probe+0x94): undefined reference to `__devm_regmap_init_i2c'
>
> so the dependency would be "depends on I2C=y", getting increasingly
> ugly. I'll let Marcin or Grygorii reply on why the call is needed,
> we can then either export the symbol or change the code.
>
> 	Arnd
>

I have added irq_set_parent() similarly as in 
drivers/base/regmap/regmap-irq.c

But to be honest I am not sure what it really does in case of tps65217.

-- 
Marcin Niestroj