patches/timers-prepare-for-full-preemption-improve.patch

From a57194f115acfc967aa0907bc130e95b68723121 Mon Sep 17 00:00:00 2001
From: Zhao Hongjiang <zhaohongjiang@huawei.com>
Date: Wed, 17 Apr 2013 17:44:16 +0800
Subject: [PATCH] timers: prepare for full preemption improve

wake_up should do nothing on the nort, so we should use wakeup_timer_waiters,
also fix a spell mistake.

Cc: stable-rt@vger.kernel.org
Signed-off-by: Zhao Hongjiang <zhaohongjiang@huawei.com>
[bigeasy: s/CONFIG_PREEMPT_RT_BASE/CONFIG_PREEMPT_RT_FULL/]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 kernel/timer.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -78,7 +78,9 @@ struct tvec_root {
 struct tvec_base {
 	spinlock_t lock;
 	struct timer_list *running_timer;
+#ifdef CONFIG_PREEMPT_RT_FULL
 	wait_queue_head_t wait_for_running_timer;
+#endif
 	unsigned long timer_jiffies;
 	unsigned long next_timer;
 	unsigned long active_timers;
@@ -962,7 +964,7 @@ static void wait_for_running_timer(struc
 			   base->running_timer != timer);
 }
 
-# define wakeup_timer_waiters(b)	wake_up(&(b)->wait_for_tunning_timer)
+# define wakeup_timer_waiters(b)	wake_up(&(b)->wait_for_running_timer)
 #else
 static inline void wait_for_running_timer(struct timer_list *timer)
 {
@@ -1216,7 +1218,7 @@ static inline void __run_timers(struct t
 			}
 		}
 	}
-	wake_up(&base->wait_for_running_timer);
+	wakeup_timer_waiters(base);
 	spin_unlock_irq(&base->lock);
 }
 
@@ -1576,7 +1578,9 @@ static int __cpuinit init_timers_cpu(int
 		base = per_cpu(tvec_bases, cpu);
 	}
 
+#ifdef CONFIG_PREEMPT_RT_FULL
 	init_waitqueue_head(&base->wait_for_running_timer);
+#endif
 
 	for (j = 0; j < TVN_SIZE; j++) {
 		INIT_LIST_HEAD(base->tv5.vec + j);