linux-kernel - Always print panic message on current console

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Message-Id: <1255295071-13664-1-git-send-email-bernhard@bwalle.de>
Date:	Sun, 11 Oct 2009 23:04:29 +0200
From:	Bernhard Walle <bernhard@...lle.de>
To:	akpm@...uxfoundation.org
Cc:	alan@...rguk.ukuu.org.uk, linux-kernel@...r.kernel.org,
	Bernhard Walle <bernhard@...lle.de>
Subject: Always print panic message on current console

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.

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).

Signed-off-by: Bernhard Walle <bernhard@...lle.de>

---
 drivers/char/vt.c      |   43 +++++++++++++++++++++++++++++++++++++------
 include/linux/tty.h    |    2 --
 include/linux/vt.h     |   15 +++++++++++++++
 kernel/panic.c         |    4 ++++
 kernel/power/console.c |    7 +++----
 5 files changed, 59 insertions(+), 12 deletions(-)

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