From 74782137f12dad1f1914d6c5cde4fb096584196d Mon Sep 17 00:00:00 2001
From: Steven Rostedt <rostedt@goodmis.org>
Date: Thu, 3 Jul 2008 14:31:26 -0400
Subject: [PATCH] --- yaml --- r: 98644 b: refs/heads/master c:
 ee3ece830f6db9837f7ac67008f532a8c1e755f4 h: refs/heads/master v: v3

---
 [refs]                 | 2 +-
 trunk/kernel/hrtimer.c | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 3aa9f4f8661b..1c23a347ea9d 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6beef7eb0c16b5216814148b04838cfa963d2cb4
+refs/heads/master: ee3ece830f6db9837f7ac67008f532a8c1e755f4
diff --git a/trunk/kernel/hrtimer.c b/trunk/kernel/hrtimer.c
index 421be5fe5cc7..ab80515008f4 100644
--- a/trunk/kernel/hrtimer.c
+++ b/trunk/kernel/hrtimer.c
@@ -1003,10 +1003,18 @@ hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
 	 */
 	raise = timer->state == HRTIMER_STATE_PENDING;
 
+	/*
+	 * We use preempt_disable to prevent this task from migrating after
+	 * setting up the softirq and raising it. Otherwise, if me migrate
+	 * we will raise the softirq on the wrong CPU.
+	 */
+	preempt_disable();
+
 	unlock_hrtimer_base(timer, &flags);
 
 	if (raise)
 		hrtimer_raise_softirq();
+	preempt_enable();
 
 	return ret;
 }