sh: Restore bl bit toggling in idle loop.

This fixes up some crashes with IRQs racing the need_resched() test under
QEMU.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/sh/kernel/idle.c b/arch/sh/kernel/idle.c
index aaff0037fcd7..8e47565dcfd1 100644
--- a/arch/sh/kernel/idle.c
+++ b/arch/sh/kernel/idle.c
@@ -92,6 +92,7 @@ void cpu_idle(void)
                         check_pgt_cache();
                         rmb();
 
+                        set_bl_bit();
                         local_irq_disable();
                         /* Don't trace irqs off for idle */
                         stop_critical_timings();
@@ -102,6 +103,7 @@ void cpu_idle(void)
                          */
                         WARN_ON(irqs_disabled());
                         start_critical_timings();
+                        clear_bl_bit();
                 }
 
                 tick_nohz_restart_sched_tick();