[PATCH] kgdb: depends on VT

[Jiri Slaby]

With VT=n, the kernel build fails with:
drivers/built-in.o: In function `kgdboc_pre_exp_handler':
kgdboc.c:(.text+0x7b5aa): undefined reference to `fg_console'
kgdboc.c:(.text+0x7b5ce): undefined reference to `vc_cons'
kgdboc.c:(.text+0x7b5d5): undefined reference to `vc_cons'

kgdboc.o is built when KGDB_SERIAL_CONSOLE is set. So make
KGDB_SERIAL_CONSOLE depend on HW_CONSOLE which includes those symbols.

Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
Reported-by: "Jim Davis" <jim.epost@xxxxxxxxx>
Cc: Jason Wessel <jason.wessel@xxxxxxxxxxxxx>
Cc: <kgdb-bugreport@xxxxxxxxxxxxxxxxxxxxx>
Cc: <linux-serial@xxxxxxxxxxxxxxx>
---
 lib/Kconfig.kgdb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb
index c635a107a7de..533f912638ed 100644
--- a/lib/Kconfig.kgdb
+++ b/lib/Kconfig.kgdb
@@ -22,7 +22,7 @@ config KGDB_SERIAL_CONSOLE
 	tristate "KGDB: use kgdb over the serial console"
 	select CONSOLE_POLL
 	select MAGIC_SYSRQ
-	depends on TTY
+	depends on TTY && HW_CONSOLE
 	default y
 	help
 	  Share a serial console with kgdb. Sysrq-g must be used
-- 
2.7.0