Hi Greg,

After merging the tty tree, today's linux-next build (x86_64 allmodconfig)
failed like this:

drivers/usb/misc/sisusbvga/sisusb_con.c: In function 'sisusb_console_init':
drivers/usb/misc/sisusbvga/sisusb_con.c:1493:2: error: implicit declaration of function 'take_over_console' [-Werror=implicit-function-declaration]
  ret = take_over_console(&sisusb_con, first - 1, last - 1, 0);
  ^
cc1: some warnings being treated as errors

Caused by commit dc9641895abb ("vt: delete unneeded functions
register_con_driver|take_over_console").  Grep is your friend!  There is
more to clean up here:

Documentation/console/console.txt:call take_over_console() will succeed in the takeover regardless of the type
Documentation/console/console.txt:	 take_over_console() - load and bind driver to console layer
Documentation/console/console.txt:take_over_console() is now broken up into:
Documentation/console/console.txt:   or take_over_console(). register_con_driver() will just add the driver to
Documentation/console/console.txt:   console. take_over_console(), as it name implies, will also take over (or
arch/alpha/kernel/console.c:	take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1);
arch/alpha/kernel/process.c:		take_over_console(&dummy_con, 0, MAX_NR_CONSOLES-1, 1);
arch/mips/pci/pci-bcm1480.c:	take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1);
arch/mips/pci/pci-sb1250.c:	take_over_console(&vga_con, 0, MAX_NR_CONSOLES - 1, 1);
arch/parisc/kernel/setup.c:	conswitchp = &dummy_con;	/* we use take_over_console() later ! */
drivers/tty/vt/vt.c: *	take_over_console is basically a register followed by unbind
drivers/usb/misc/sisusbvga/sisusb_con.c:	/* This is called by take_over_console(),
drivers/usb/misc/sisusbvga/sisusb_con.c:	/* This is called by take_over_console()
drivers/usb/misc/sisusbvga/sisusb_con.c:	ret = take_over_console(&sisusb_con, first - 1, last - 1, 0);
drivers/usb/misc/sisusbvga/sisusb_con.c:				take_over_console(&sisusb_dummy_con, i, i, 0);
drivers/usb/misc/sisusbvga/sisusb_con.c:				 * consoles is executed by take_over_console().
drivers/video/console/fbcon.c:/* NOTE: fbcon cannot be __init: it may be called from take_over_console later */
drivers/video/console/mdacon.c:	return take_over_console(&mda_con, mda_first_vc-1, mda_last_vc-1, 0);
drivers/video/console/newport_con.c:/* Can't be __init, take_over_console may call it later */
drivers/video/console/newport_con.c:	return take_over_console(&newport_con, 0, MAX_NR_CONSOLES - 1, 1);
drivers/video/console/sticon.c:	return take_over_console(&sti_con, 0, MAX_NR_CONSOLES - 1, 1);

Documentation/console/console.txt:	 register_con_driver()
Documentation/console/console.txt:     register_con_driver()
Documentation/console/console.txt:1. All drivers, except system drivers, must call either register_con_driver()
Documentation/console/console.txt:   or take_over_console(). register_con_driver() will just add the driver to

I have used the version of the tty tree from next-20130520 for today.
-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au