Merge tag 'stable/for-linus-3.12-rc0-tag-two' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull Xen bug-fixes from Konrad Rzeszutek Wilk:
 "This pull I usually do after rc1 is out but because we have a nice
  amount of fixes, some bootup related fixes for ARM, and it is early in
  the cycle we figured to do it now to help with tracking of potential
  regressions.

  The simple ones are the ARM ones - one of the patches fell through the
  cracks, other fixes a bootup issue (unconditionally using Xen
  functions).  Then a fix for a regression causing preempt count being
  off (patch causing this went in v3.12).

  Lastly are the fixes to make Xen PVHVM guests use PV ticketlocks (Xen
  PV already does).

  The enablement of that was supposed to be part of the x86 spinlock
  merge in commit 816434ec4a67 ("The biggest change here are
  paravirtualized ticket spinlocks (PV spinlocks), which bring a nice
  speedup on various benchmarks...") but unfortunatly it would cause
  hang when booting Xen PVHVM guests.  Yours truly got all of the bugs
  fixed last week and they (six of them) are included in this pull.

  Bug-fixes:
   - Boot on ARM without using Xen unconditionally
   - On Xen ARM don't run cpuidle/cpufreq
   - Fix regression in balloon driver, preempt count warnings
   - Fixes to make PVHVM able to use pv ticketlock.
   - Revert Xen PVHVM disabling pv ticketlock (aka, re-enable pv ticketlocks)"

* tag 'stable/for-linus-3.12-rc0-tag-two' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/spinlock: Don't use __initdate for xen_pv_spin
  Revert "xen/spinlock: Disable IRQ spinlock (PV) allocation on PVHVM"
  xen/spinlock: Don't setup xen spinlock IPI kicker if disabled.
  xen/smp: Update pv_lock_ops functions before alternative code starts under PVHVM
  xen/spinlock: We don't need the old structure anymore
  xen/spinlock: Fix locking path engaging too soon under PVHVM.
  xen/arm: disable cpuidle and cpufreq when linux is running as dom0
  xen/p2m: Don't call get_balloon_scratch_page() twice, keep interrupts disabled for multicalls
  ARM: xen: only set pm function ptrs for Xen guests

1 files changed, 13 insertions, 1 deletions

diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 8a6295c86209..83e4f959ee47 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -21,6 +21,8 @@
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/of_address.h>
+#include <linux/cpuidle.h>
+#include <linux/cpufreq.h>
 
 #include <linux/mm.h>
 
@@ -267,18 +269,28 @@ static int __init xen_guest_init(void)
 	if (!xen_initial_domain())
 		xenbus_probe(NULL);
 
+	/*
+	 * Making sure board specific code will not set up ops for
+	 * cpu idle and cpu freq.
+	 */
+	disable_cpuidle();
+	disable_cpufreq();
+
 	return 0;
 }
 core_initcall(xen_guest_init);
 
 static int __init xen_pm_init(void)
 {
+	if (!xen_domain())
+		return -ENODEV;
+
 	pm_power_off = xen_power_off;
 	arm_pm_restart = xen_restart;
 
 	return 0;
 }
-subsys_initcall(xen_pm_init);
+late_initcall(xen_pm_init);
 
 static irqreturn_t xen_arm_callback(int irq, void *arg)
 {