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

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Message-ID: <CAL_JsqKCnxenDN-5OP1yqAyyW1-cuhs47CeosAj12hr89e6CrA@mail.gmail.com>
Date:	Thu, 21 Jan 2016 08:09:13 -0600
From:	Rob Herring <robh+dt@...nel.org>
To:	Arnd Bergmann <arnd@...db.de>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:	"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

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.

Rob