This is a note to let you know that I've just added the patch titled
printk: Fix scheduling-while-atomic problem in console_cpu_notify()
to the 3.4-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:
printk-fix-scheduling-while-atomic-problem-in-console_cpu_notify.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 85eae82a0855d49852b87deac8653e4ebc8b291f Mon Sep 17 00:00:00 2001
From: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
Date: Mon, 15 Oct 2012 21:35:59 -0700
Subject: printk: Fix scheduling-while-atomic problem in console_cpu_notify()
From: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
commit 85eae82a0855d49852b87deac8653e4ebc8b291f upstream.
The console_cpu_notify() function runs with interrupts disabled in the
CPU_DYING case. It therefore cannot block, for example, as will happen
when it calls console_lock(). Therefore, remove the CPU_DYING leg of
the switch statement to avoid this problem.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Guillaume Morin <guillaume@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/printk.c | 1 -
1 file changed, 1 deletion(-)
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -1172,7 +1172,6 @@ static int __cpuinit console_cpu_notify(
switch (action) {
case CPU_ONLINE:
case CPU_DEAD:
- case CPU_DYING:
case CPU_DOWN_FAILED:
case CPU_UP_CANCELED:
console_lock();
Patches currently in stable-queue which might be from paulmck@xxxxxxxxxxxxxxxxxx are
queue-3.4/printk-fix-scheduling-while-atomic-problem-in-console_cpu_notify.patch
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