Always print panic message on current console

[Bernhard Walle]

The kernel offers with TIOCL_GETKMSGREDIRECT ioctl() the possibility to
redirect the kernel messages to a specific console.

However, since it's not possible to switch to the kernel message console after
a panic(), it would be nice if the kernel would print the panic message on the
current console.

As suggested by Andrew, this patch series adds a new interface to access
the global kmsg_redirect variable by a function to be able to use it in
code where CONFIG_VT_CONSOLE is not set (kernel/panic.c).

The patch series makes kmsg_redirect a static variable and all kernel
code outside of vt.c accesses that variable by the vt_set_kmsg_redirect()
and vt_get_kmsg_redirect() functions.


Signed-off-by: Bernhard Walle <bernhard@xxxxxxxxx>

---
 drivers/char/vt.c      |   41 ++++++++++++++++++++++++++++++++++++++++-
 include/linux/tty.h    |    2 --
 include/linux/vt.h     |   18 ++++++++++++++++++
 kernel/panic.c         |    4 ++++
 kernel/power/console.c |    8 ++++----
 5 files changed, 66 insertions(+), 7 deletions(-)


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