linux-kernel - Re: [PATCH 1/2] serial: 8250: fix building mediatek with SERIAL

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Date:	Thu, 11 Feb 2016 14:49:43 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-arm-kernel@...ts.infradead.org,
	Eddie Huang <eddie.huang@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Matt Redfearn <matt.redfearn@...tec.com>,
	Paul Burton <paul.burton@...tec.com>,
	Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
	linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] serial: 8250: fix building mediatek with SERIAL_8250=m

On Monday 08 February 2016 11:55:35 Paul Gortmaker wrote:
> > drivers/tty/built-in.o: In function `mtk8250_set_termios':
> > 8250_ingenic.c:(.text+0x1bee8): undefined reference to `serial8250_do_set_termios'
> > 8250_ingenic.c:(.text+0x1bf10): undefined reference to `uart_get_baud_rate'
> > 8250_ingenic.c:(.text+0x1c09c): undefined reference to `uart_get_divisor'
> > drivers/tty/built-in.o: In function `mtk8250_do_pm':
> > 8250_ingenic.c:(.text+0x1c0d0): undefined reference to `serial8250_do_pm'
> > drivers/tty/built-in.o: In function `mtk8250_probe':
> > 8250_ingenic.c:(.text+0x1c2e4): undefined reference to `serial8250_register_8250_port'
> > serial/8250/8250_mtk.c:287:242: error: data definition has no type or storage class [-Werror]
> > serial/8250/8250_mtk.c:287:122: error: 'mtk8250_platform_driver_init' defined but not used [-Werror=unused-function]
> 
> Probably should drop the ingenic lines above ; assuming they are make -j N
> related and that mtk doesn't depend on or build ingenic.

I looked at these again and noticed that this is just being misreported
by the linker. I don't know exactly what happens here but I see it a lot:
the function names ("mtk8250_set_termios") are all correct, but the file
names ("8250_ingenic.c") are wrong. I normally edit out the file names
manually but forgot that here. I'll fix it up when resending.

	Arnd