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tty: goldfish: Enable 'earlycon' only if built-in 

Commit 3840ed9548 ("tty: goldfish: Implement support for kernel
'earlycon' parameter") breaks an allmodconfig config on x86:
|  LD      vmlinux.o
|  MODPOST vmlinux.o
|drivers/tty/serial/earlycon.o: In function `parse_options':
|drivers/tty/serial/earlycon.c:97: undefined reference to `uart_parse_earlycon'
|Makefile:1005: recipe for target 'vmlinux' failed

earlycon.c::parse_options() invokes uart_parse_earlycon() from serial_core.c
which is compiled=m because GOLDFISH_TTY itself (and most others) are =m.
To avoid that, I'm adding the _CONSOLE config option which is selected if the
GOLDFISH module itself is =y since it doesn't need the early bits for the =m
case (other drivers do the same dance).
The alternative would be to move uart_parse_earlycon() from
serial_core.c to earlycon.c (we don't have that many users of that
function).

Fixes: 3840ed9548 ("tty: goldfish: Implement support for kernel
       'earlycon' parameter")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Miodrag Dinic <miodrag.dinic@mips.com>
Acked-by: Miodrag Dinic <miodrag.dinic@mips.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sebastian Andrzej Siewior 2017-11-30 09:16:31 +01:00 committed by Greg Kroah-Hartman
parent 93ad86735d
commit 6a28fd2bbc
2 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/tty/Kconfig
View File

@ -394,10 +394,14 @@ config GOLDFISH_TTY
depends on GOLDFISH
select SERIAL_CORE
select SERIAL_CORE_CONSOLE
select SERIAL_EARLYCON
help
Console and system TTY driver for the Goldfish virtual platform.
config GOLDFISH_TTY_EARLY_CONSOLE
bool
default y if GOLDFISH_TTY=y
select SERIAL_EARLYCON
config DA_TTY
bool "DA TTY"
depends on METAG_DA

2
drivers/tty/goldfish.c
View File

@ -433,6 +433,7 @@ static int goldfish_tty_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_GOLDFISH_TTY_EARLY_CONSOLE
static void gf_early_console_putchar(struct uart_port *port, int ch)
{
__raw_writel(ch, port->membase);
@ -456,6 +457,7 @@ static int __init gf_earlycon_setup(struct earlycon_device *device,
}
OF_EARLYCON_DECLARE(early_gf_tty, "google,goldfish-tty", gf_earlycon_setup);
#endif
static const struct of_device_id goldfish_tty_of_match[] = {
{ .compatible = "google,goldfish-tty", },