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From 77b8b33c220d948edbe743181a3df705becddab9 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 3 Jul 2009 13:16:25 -0500
Subject: [PATCH] sched: enable irqs in fire_sched_in_preempt_notifier
commit 54afe8908e5645ae6d5d8a8a3ea0b7e81076d2d5 in tip.
KVM expects the notifier call with irqs enabled. It's necessary due
to a possible IPI call. Make the preempt-rt version behave the same
way as mainline.
Signed-off-by: Thomas Gleixner <tgxl@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
kernel/sched.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index a194f62..a39592e 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2833,8 +2833,17 @@ static void fire_sched_in_preempt_notifiers(struct task_struct *curr)
struct preempt_notifier *notifier;
struct hlist_node *node;
+ if (hlist_empty(&curr->preempt_notifiers))
+ return;
+
+ /*
+ * The KVM sched in notifier expects to be called with
+ * interrupts enabled.
+ */
+ local_irq_enable();
hlist_for_each_entry(notifier, node, &curr->preempt_notifiers, link)
notifier->ops->sched_in(notifier, raw_smp_processor_id());
+ local_irq_disable();
}
static void
--
1.7.0.4
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