linux-kernel - Re: [PATCH] 8250: uniphier: allow modular build with 8250 console

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Date:	Fri, 22 Jan 2016 01:50:01 +0900
From:	Masahiro Yamada <yamada.masahiro@...ionext.com>
To:	Rob Herring <robh+dt@...nel.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Hurley <peter@...leysoftware.com>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Frank Rowand <frowand.list@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH] 8250: uniphier: allow modular build with 8250 console

Hi Rob.


2016-01-21 23:09 GMT+09:00 Rob Herring <robh+dt@...nel.org>:
> On Thu, Jan 21, 2016 at 6:21 AM, Arnd Bergmann <arnd@...db.de> wrote:
>> On Thursday 21 January 2016 20:39:03 Masahiro Yamada wrote:
>>> 2016-01-14 7:33 GMT+09:00 Arnd Bergmann <arnd@...db.de>:
>>> > The recently added uniphier 8250 port driver supports early console
>>> > probing, and it supports being built as a module, but the combination
>>> > of the two fails to link:
>>> >
>>> > ERROR: "early_serial8250_setup" [drivers/tty/serial/8250/8250_uniphier.ko] undefined!
>>> >
>>> > Given that earlycon support in a loadable module makes no sense,
>>> > making that code conditional on 'MODULE' is a correct solution.
>>> >
>>> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
>>> > Fixes: b8d20e06eaad ("serial: 8250_uniphier: add earlycon support")
>>> >
>>> > diff --git a/drivers/tty/serial/8250/8250_uniphier.c b/drivers/tty/serial/8250/8250_uniphier.c
>>> > index bab6b3ae2540..1b7bd26555b7 100644
>>> > --- a/drivers/tty/serial/8250/8250_uniphier.c
>>> > +++ b/drivers/tty/serial/8250/8250_uniphier.c
>>> > @@ -35,7 +35,7 @@ struct uniphier8250_priv {
>>> >         spinlock_t atomic_write_lock;
>>> >  };
>>> >
>>> > -#ifdef CONFIG_SERIAL_8250_CONSOLE
>>> > +#if defined(CONFIG_SERIAL_8250_CONSOLE) && !defined(MODULE)
>>> >  static int __init uniphier_early_console_setup(struct earlycon_device *device,
>>> >                                                const char *options)
>>> >  {
>>> >
>>> >
>>>
>>>
>>> If my patch (https://patchwork.kernel.org/patch/8029331/) is accepted,
>>> this build error will be fixed as well.  But I doubt it is accepted soon...
>>>
>>> So, I am OK with this workaround to fix "make allmodconfig".
>>>
>>> Acked-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
>>>
>>
>> Good point. Adding the DT maintainers to Cc. Guys, any chance of you
>> picking up Masahiro's patch for 4.5?
>
> I will if you can update the commit log with the details here about it
> fixing an actual problem.

I did so in v2.

Thanks!




-- 
Best Regards
Masahiro Yamada