From: Ingo Molnar <mingo@elte.hu>
Date: Thu, 26 Feb 2009 20:21:59 +0000 (+0100)
Subject: Merge branch 'sched/clock' into tracing/ftrace
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5d0859cef29167d45dc6cf89d19712145e6005d6;p=linux-beck.git

Merge branch 'sched/clock' into tracing/ftrace

Conflicts:
	kernel/sched_clock.c
---

5d0859cef29167d45dc6cf89d19712145e6005d6
diff --cc kernel/sched_clock.c
index db69174b1178,a755d023805a..f7602da84c40
--- a/kernel/sched_clock.c
+++ b/kernel/sched_clock.c
@@@ -24,12 -24,11 +24,12 @@@
   * The clock: sched_clock_cpu() is monotonic per cpu, and should be somewhat
   * consistent between cpus (never more than 2 jiffies difference).
   */
- #include <linux/sched.h>
- #include <linux/percpu.h>
  #include <linux/spinlock.h>
- #include <linux/ktime.h>
- #include <linux/module.h>
 +#include <linux/hardirq.h>
+ #include <linux/module.h>
+ #include <linux/percpu.h>
+ #include <linux/ktime.h>
+ #include <linux/sched.h>
  
  /*
   * Scheduler clock - returns current time in nanosec units.
@@@ -149,19 -155,13 +156,23 @@@ static void lock_double_clock(struct sc
  
  u64 sched_clock_cpu(int cpu)
  {
- 	struct sched_clock_data *scd = cpu_sdc(cpu);
  	u64 now, clock, this_clock, remote_clock;
+ 	struct sched_clock_data *scd;
+ 
+ 	if (sched_clock_stable)
+ 		return sched_clock();
  
 +	/*
 +	 * Normally this is not called in NMI context - but if it is,
 +	 * trying to do any locking here is totally lethal.
 +	 */
 +	if (unlikely(in_nmi()))
 +		return scd->clock;
 +
 +	if (unlikely(!sched_clock_running))
 +		return 0ull;
 +
+ 	scd = cpu_sdc(cpu);
  	WARN_ON_ONCE(!irqs_disabled());
  	now = sched_clock();