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sched_clock: delay using sched_clock()

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Some arch's can't handle sched_clock() being called too early - delay
this until sched_clock_init() has been called.

Reported-by: Bill Gatliff <bgat@billgatliff.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Tested-by: Nishanth Aravamudan <nacc@us.ibm.com>
CC: Russell King - ARM Linux <linux@arm.linux.org.uk>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2008-08-11 08:59:03 +02:00
committed by Ingo Molnar
parent 4a273f209c
commit c1955a3d47
2 changed files with 20 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/sched_clock.c
+17 -2
View File
@@ -42,6 +42,8 @@ unsigned long long __attribute__((weak)) sched_clock(void)
return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ);
}
static __read_mostly int sched_clock_running;
#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
struct sched_clock_data {
@@ -70,8 +72,6 @@ static inline struct sched_clock_data *cpu_sdc(int cpu)
return &per_cpu(sched_clock_data, cpu);
}
static __read_mostly int sched_clock_running;
void sched_clock_init(void)
{
u64 ktime_now = ktime_to_ns(ktime_get());
@@ -248,6 +248,21 @@ void sched_clock_idle_wakeup_event(u64 delta_ns)
}
EXPORT_SYMBOL_GPL(sched_clock_idle_wakeup_event);
#else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
void sched_clock_init(void)
{
sched_clock_running = 1;
}
u64 sched_clock_cpu(int cpu)
{
if (unlikely(!sched_clock_running))
return 0;
return sched_clock();
}
#endif
unsigned long long cpu_clock(int cpu)