[tip:smp/hotplug] ia64: Make sure interrupts enabled when we "safe_halt()"

[tip-bot for Luck, Tony]

Commit-ID:  2412aa1293a4159c610616305c17efd237c8208d
Gitweb:     http://git.kernel.org/tip/2412aa1293a4159c610616305c17efd237c8208d
Author:     Luck, Tony <tony.luck@xxxxxxxxx>
AuthorDate: Tue, 16 Apr 2013 11:35:56 -0700
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Wed, 17 Apr 2013 10:39:37 +0200

ia64: Make sure interrupts enabled when we "safe_halt()"

In commit d166991234347215dc23fc9dc15a63a83a1a54e1
   idle: Implement generic idle function
Thomas Gleixner cleaned up many things but perturbed some
fragile code that was keeping ia64 alive. So we started
seeing:
   WARNING: at kernel/cpu/idle.c:94 cpu_idle_loop+0x360/0x380()
and other unpleasantness like system hangs during boot.

We really shouldn't ever halt with interrupts disabled.

Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
Cc: Paul McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: magnus.damm@xxxxxxxxx
Link: http://lkml.kernel.org/r/516d9a0c26048eae9c@xxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

---
 arch/ia64/include/asm/irqflags.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/ia64/include/asm/irqflags.h b/arch/ia64/include/asm/irqflags.h
index 2b68d85..1bf2cf2 100644
--- a/arch/ia64/include/asm/irqflags.h
+++ b/arch/ia64/include/asm/irqflags.h
@@ -89,6 +89,7 @@ static inline bool arch_irqs_disabled(void)
 
 static inline void arch_safe_halt(void)
 {
+	arch_local_irq_enable();
 	ia64_pal_halt_light();	/* PAL_HALT_LIGHT */
 }
 
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