This is a note to let you know that I've just added the patch titled
kernel/printk: do not turn off bootconsole in printk_late_init() if
keep_bootcon
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kernel-printk-do-not-turn-off-bootconsole-in-printk_late_init-if-keep_bootcon.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <sta...@kernel.org> know about it.
>From 4c30c6f566c0989ddaee3407da44751e340a63ed Mon Sep 17 00:00:00 2001
From: Nishanth Aravamudan <n...@us.ibm.com>
Date: Thu, 25 Aug 2011 15:59:11 -0700
Subject: kernel/printk: do not turn off bootconsole in printk_late_init() if
keep_bootcon
From: Nishanth Aravamudan <n...@us.ibm.com>
commit 4c30c6f566c0989ddaee3407da44751e340a63ed upstream.
It seems that 7bf693951a8e ("console: allow to retain boot console via
boot option keep_bootcon") doesn't always achieve what it aims, as when
printk_late_init() runs it unconditionally turns off all boot consoles.
With this patch, I am able to see more messages on the boot console in
KVM guests than I can without, when keep_bootcon is specified.
I think it is appropriate for the relevant -stable trees. However, it's
more of an annoyance than a serious bug (ideally you don't need to keep
the boot console around as console handover should be working -- I was
encountering a situation where the console handover wasn't working and
not having the boot console available meant I couldn't see why).
Signed-off-by: Nishanth Aravamudan <n...@us.ibm.com>
Cc: David S. Miller <da...@davemloft.net>
Cc: Alan Cox <a...@lxorguk.ukuu.org.uk>
Cc: Greg KH <gre...@suse.de>
Acked-by: Fabio M. Di Nitto <fdini...@redhat.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>
---
kernel/printk.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -1584,7 +1584,7 @@ static int __init printk_late_init(void)
struct console *con;
for_each_console(con) {
- if (con->flags & CON_BOOT) {
+ if (!keep_bootcon && con->flags & CON_BOOT) {
printk(KERN_INFO "turn off boot console %s%d\n",
con->name, con->index);
unregister_console(con);
Patches currently in stable-queue which might be from n...@us.ibm.com are
queue-3.0/kernel-printk-do-not-turn-off-bootconsole-in-printk_late_init-if-keep_bootcon.patch
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