[tip:sched/core] sched: Disable scheduler warnings during oopses

[tip-bot for Dave Jones <davej@redhat.com>]

Commit-ID:  664dfa65e84429d0b68694483e1de7365c7c56fb
Gitweb:     http://git.kernel.org/tip/664dfa65e84429d0b68694483e1de7365c7c56fb
Author:     Dave Jones <davej@redhat.com>
AuthorDate: Thu, 22 Dec 2011 16:39:30 -0500
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Fri, 23 Dec 2011 11:20:50 +0100

sched: Disable scheduler warnings during oopses

The panic-on-framebuffer code seems to cause a schedule
to occur during an oops. This causes a bunch of extra
spew as can be seen in:

   https://bugzilla.redhat.com/attachment.cgi?id=549230

Don't do scheduler debug checks when we are oopsing already.

Signed-off-by: Dave Jones <davej@redhat.com>
Link: http://lkml.kernel.org/r/20111222213929.GA4722@redhat.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 kernel/sched/core.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 081ece2..8ffe523 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3077,6 +3077,9 @@ static noinline void __schedule_bug(struct task_struct *prev)
 {
 	struct pt_regs *regs = get_irq_regs();
 
+	if (oops_in_progress)
+		return;
+
 	printk(KERN_ERR "BUG: scheduling while atomic: %s/%d/0x%08x\n",
 		prev->comm, prev->pid, preempt_count());