linux-kernel - Re: [PATCH v2] serial: earlycon: rework common framework for earlycon declarations

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Date:	Tue, 16 Feb 2016 17:31:48 -0800
From:	Peter Hurley <peter@...leysoftware.com>
To:	Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:	linux-serial@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	devicetree@...r.kernel.org, Rob Herring <robh@...nel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-arch@...r.kernel.org, Jiri Slaby <jslaby@...e.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Frank Rowand <frowand.list@...il.com>
Subject: Re: [PATCH v2] serial: earlycon: rework common framework for earlycon
 declarations

On 02/12/2016 08:30 AM, Masahiro Yamada wrote:
> Hi Peter,
> 
> 
> 2016-02-13 0:17 GMT+09:00 Peter Hurley <peter@...leysoftware.com>:
>> On 02/12/2016 02:36 AM, Masahiro Yamada wrote:
>>> Commit 71f50c6d9a22 ("of: drop symbols declared by _OF_DECLARE() from
>>> modules") fixed the link error introduced by commit b8d20e06eaad
>>> ("serial: 8250_uniphier: add earlycon support").
>>>
>>> After commit 2eaa790989e0 ("earlycon: Use common framework for
>>> earlycon declarations") was applied, the link error came back
>>> because the commit reworked OF_EARLYCON_DECLARE() to not use
>>> _OF_DECLARE().
>>
>> What link error are you getting?
> 
> The combination of CONFIG_SERIAL_8250_CONSOLE=y
> and CONFIG_SERIAL_8250_UNIPHIER=m causes a link error.
> 
> 
> 
>>
>>> This commit reworks OF_EARLYCON_DECLARE() again based on
>>> _OF_DECLARE().  My motivations are:
>>>
>>>  - Fix the link error in a generic way (without patching
>>>    drivers/tty/serial/8250/8250_uniphier.c)
>>>
>>>  - Delete struct earlycon_id.  This struct is re-inventing the wheel;
>>>    the fields "name", "compatible", "setup" can be implemented in
>>>    struct of_device_id as other frameworks do.
>>
>> This patch basically reverts the common framework.
>> What happens when not building with OF? Does it still declare the
>> earlycon table?
> 
> Ah, I missed this.  (sigh)
> 
> Earlycon must still work without OF.
> My way only works with OF.
> 
> I really screwed up.  Sorry.

Hi Masahiro,

No big deal.

We need to come up with a better way to enable earlycon builds and
opt-in by driver than the current method. Breaking builds with earlycon
support has happened several times in the last couple of years so
it's not just you.

Regards,
Peter Hurley