write_msg(netconsole.c:836) calls netpoll_send_udp after a call to
spin_lock_irqsave, which normally disables interrupts; but in PREEMPT_RT
this call just locks an rt_mutex without disabling irqs. In this case,
netpoll_send_udp is called with interrupts enabled.
Signed-off-by: Wander Lairson Costa <wander@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>