From: Feng Tang <feng.tang@intel.com>
Date: Tue, 22 Mar 2011 23:34:21 +0000 (-0700)
Subject: console: prevent registered consoles from dumping old kernel message over again
X-Git-Tag: v2.6.39-rc1~255
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fe3d8ad31cf51b062bbb8a9609eeb1d0c41a7f30;p=pandora-kernel.git

console: prevent registered consoles from dumping old kernel message over again

For a platform with many consoles like:
 "console=tty1 console=ttyMFD2 console=ttyS0 earlyprintk=mrst"

Each time when the non "selected_console" (tty1 and ttyMFD2 here) get
registered, the existing kernel message will be printed out on registered
consoles again, the "mrst" early console will get some same message for 3
times, and "tty1" will get some for twice.

As suggested by Andrew Morton, every time a new console is registered, it
will be set as the "exclusive" console which will dump the already
existing kernel messages.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Cc: Greg KH <gregkh@suse.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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