[Precise SRU] Revert "[PATCH] UBUNTU: SAUCE: xen/pv-spinlock: Never enable interrupts in xen_spin_lock_slow()"

[Stefan Bader]

With the other change interrupts can again be enabled.

>From 85ae0d56d9f7a6a960c4c0f943b92718a1ee8e98 Mon Sep 17 00:00:00 2001
From: Stefan Bader <stefan.bader at canonical.com>
Date: Mon, 25 Mar 2013 10:01:44 +0100
Subject: [PATCH] Revert "[PATCH] UBUNTU: SAUCE: xen/pv-spinlock: Never enable
 interrupts in xen_spin_lock_slow()"

This reverts commit dec8ea944c1a873ccc33680e6155b829d3e129b2 because it
is superseded by:

  commit b140196cc362cffd2add6ed355bd88001b575e16
  Date:   Fri Feb 15 09:48:52 2013 +0100

    xen: Send spinlock IPI to all waiters

Signed-off-by: Stefan Bader <stefan.bader at canonical.com>
---
 arch/x86/xen/spinlock.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
index ca290d0..67bc7ba 100644
--- a/arch/x86/xen/spinlock.c
+++ b/arch/x86/xen/spinlock.c
@@ -242,7 +242,7 @@ static noinline int xen_spin_lock_slow(struct arch_spinlock *lock, bool irq_enab
 		flags = arch_local_save_flags();
 		if (irq_enable) {
 			ADD_STATS(taken_slow_irqenable, 1);
-			/* raw_local_irq_enable(); */
+			raw_local_irq_enable();
 		}
 
 		/*
@@ -256,7 +256,7 @@ static noinline int xen_spin_lock_slow(struct arch_spinlock *lock, bool irq_enab
 		 */
 		xen_poll_irq(irq);
 
-		/* raw_local_irq_restore(flags); */
+		raw_local_irq_restore(flags);
 
 		ADD_STATS(taken_slow_spurious, !xen_test_irq_pending(irq));
 	} while (!xen_test_irq_pending(irq)); /* check for spurious wakeups */
-- 
1.7.9.5