linux-kernel - Re: [PATCH -next] tty: serial: imx: fix link error with CONFIG_SERIAL_CORE

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Date:   Sat, 19 Sep 2020 07:41:16 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] tty: serial: imx: fix link error with
 CONFIG_SERIAL_CORE_CONSOLE=n

On Sat, Sep 19, 2020 at 10:26:38AM +0800, Yang Yingliang wrote:
> Hi,
> 
> On 2020/9/18 19:16, Greg KH wrote:
> > On Fri, Sep 18, 2020 at 05:13:05PM +0800, Yang Yingliang wrote:
> > > Fix the link error by selecting SERIAL_CORE_CONSOLE.
> > > 
> > > aarch64-linux-gnu-ld: drivers/tty/serial/imx_earlycon.o: in function `imx_uart_console_early_write':
> > > imx_earlycon.c:(.text+0x84): undefined reference to `uart_console_write'
> > > 
> > > Reported-by: Hulk Robot <hulkci@...wei.com>
> > > Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> > > ---
> > >   drivers/tty/serial/Kconfig | 1 +
> > >   1 file changed, 1 insertion(+)
> > > 
> > > diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> > > index 9631ccf43378..1044fc387691 100644
> > > --- a/drivers/tty/serial/Kconfig
> > > +++ b/drivers/tty/serial/Kconfig
> > > @@ -521,6 +521,7 @@ config SERIAL_IMX_EARLYCON
> > >   	depends on ARCH_MXC || COMPILE_TEST
> > >   	depends on OF
> > >   	select SERIAL_EARLYCON
> > > +	select SERIAL_CORE_CONSOLE
> > >   	help
> > >   	  If you have enabled the earlycon on the Freescale IMX
> > >   	  CPU you can make it the earlycon by answering Y to this option.
> > > -- 
> > > 2.25.1
> > > 
> > What caused this build error to start happening?  Any pointers to the
> > specific commit?
> 
> It's start from 699cc4dfd140 ("tty: serial: imx: add imx earlycon driver"),
> the driver
> 
> uses the uart_console_write(), but SERIAL_CORE_CONSOLE is not selected, so
> uart_console_write
> 
> is not defined, then we get the error.

Great, can you add a Fixes: line to the patch and resend it with this
information added to the changelog text?

Always include this type of information if at all possible.

thanks,

greg k-h