linux-kernel - Re: [PATCH] MIPS: ath25: Avoid undefined early_serial_setup() without SERIAL_8250

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Date:   Tue, 14 Nov 2017 15:05:34 +0100
From:   Ralf Baechle <ralf@...ux-mips.org>
To:     Matt Redfearn <matt.redfearn@...s.com>
Cc:     James Hogan <james.hogan@...s.com>, linux-mips@...ux-mips.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] MIPS: ath25: Avoid undefined early_serial_setup()
 without SERIAL_8250_CONSOLE

On Tue, Nov 14, 2017 at 01:29:17PM +0000, Matt Redfearn wrote:

> Currently MIPS allnoconfig with CONFIG_ATH25=y fails to link due to
> missing support for early_serial_setup():
> 
>   LD      vmlinux
> arch/mips/ath25/devices.o: In function ath25_serial_setup':
> devices.c:(.init.text+0x68): undefined reference to 'early_serial_setup'
> 
> Rather than adding dependencies to the platform to force inclusion of
> SERIAL_8250_CONSOLE together with it's dependencies like TTY, HAS_IOMEM,
> etc, just make ath25_serial_setup() a no-op when the dependency is not
> selected in the kernel config.

Looks like arch/mips/rb532/serial.c might be suffering from the same
issue?

  Ralf