virtio: console as a config option

I also added a small Kconfig change that allows the user to specify the
virtio console in menuconfig.

(Fixes to export symbols from Stephen Rothwell <sfr@canb.auug.org.au>)
(Fixes for CONFIG_VIRTIO_CONSOLE=y vs CONFIG_VIRTIO=m from Christian himself)

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index d825361a6baf..6c070dc5f2d4 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -624,8 +624,12 @@ config HVC_XEN
           Xen virtual console device driver
 
 config VIRTIO_CONSOLE
-        bool
+        tristate "Virtio console"
+        depends on VIRTIO
         select HVC_DRIVER
+        help
+          Virtio console for use with lguest and other hypervisors.
+
 
 config HVCS
         tristate "IBM Hypervisor Virtual Console Server support"