[rfc] disable scheduler warnings during oopses.

[Dave Jones <davej@redhat.com>]

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

Would this (untested) patch be sufficient here, or does the drm
code need rearchitecting to not perform allocations during panic ?

Signed-off-by: Dave Jones <davej@redhat.com>

diff --git a/kernel/sched.c b/kernel/sched.c
index d6b149c..627f788 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4321,6 +4321,9 @@ 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());