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

With the other change interrupts can again be enabled.

From 85ae0d56d9f7a6a960c4c0f943b92718a1ee8e98 Mon Sep 17 00:00:00 2001
From: Stefan Bader <stefan.bader@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is superseded by: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@canonical.com>
---
 arch/x86/xen/spinlock.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

On 25/03/13 09:05, Stefan Bader wrote:
> With the other change interrupts can again be enabled.
>
>  From 85ae0d56d9f7a6a960c4c0f943b92718a1ee8e98 Mon Sep 17 00:00:00 2001
> From: Stefan Bader <stefan.bader@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 is superseded by: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@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 */
>

Seems most reasonable to me.

Acked-by: Colin Ian King <colin.king@canonical.com>