From: Ian Pratt This patch enables the VT console to be disabled at runtime even if it is built into the kernel. Arch xen needs this to avoid trying to initialise a VT in virtual machine that doesn't have access to the console hardware. Signed-off-by: Ian Pratt Signed-off-by: Andrew Morton --- 25-akpm/drivers/char/tty_io.c | 21 ++++++++++++++------- 1 files changed, 14 insertions(+), 7 deletions(-) diff -puN drivers/char/tty_io.c~xen-vmm-4-runtime-disable-of-vt-console drivers/char/tty_io.c --- 25/drivers/char/tty_io.c~xen-vmm-4-runtime-disable-of-vt-console 2005-01-10 21:14:27.010468752 -0800 +++ 25-akpm/drivers/char/tty_io.c 2005-01-10 21:14:27.015467992 -0800 @@ -131,6 +131,8 @@ LIST_HEAD(tty_drivers); /* linked list vt.c for deeply disgusting hack reasons */ DECLARE_MUTEX(tty_sem); +int console_use_vt = 1; + #ifdef CONFIG_UNIX98_PTYS extern struct tty_driver *ptm_driver; /* Unix98 pty masters; for /dev/ptmx */ extern int pty_limit; /* Config limit on Unix98 ptys */ @@ -2962,14 +2964,19 @@ static int __init tty_init(void) #endif #ifdef CONFIG_VT - cdev_init(&vc0_cdev, &console_fops); - if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) || - register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0) - panic("Couldn't register /dev/tty0 driver\n"); - devfs_mk_cdev(MKDEV(TTY_MAJOR, 0), S_IFCHR|S_IRUSR|S_IWUSR, "vc/0"); - class_simple_device_add(tty_class, MKDEV(TTY_MAJOR, 0), NULL, "tty0"); + if (console_use_vt) { + cdev_init(&vc0_cdev, &console_fops); + if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) || + register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, + "/dev/vc/0") < 0) + panic("Couldn't register /dev/tty0 driver\n"); + devfs_mk_cdev(MKDEV(TTY_MAJOR, 0), S_IFCHR|S_IRUSR|S_IWUSR, + "vc/0"); + class_simple_device_add(tty_class, MKDEV(TTY_MAJOR, 0), NULL, + "tty0"); - vty_init(); + vty_init(); + } #endif return 0; } _