From: Paul Mundt <lethal@linux-sh.org>
Date: Fri, 18 Dec 2009 05:19:27 +0000 (+0900)
Subject: sh: Restore bl bit toggling in idle loop.
X-Git-Tag: v2.6.33-rc2~7^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3147093e1de59081e82fb1d815424c3e952caf3e;p=platform%2Fupstream%2Fkernel-adaptation-pc.git

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>
---

diff --git a/arch/sh/kernel/idle.c b/arch/sh/kernel/idle.c
index aaff003..8e47565 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();