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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-03-10 19:03:43 +0100
committerIngo Molnar <mingo@elte.hu>2009-03-10 20:03:01 +0100
commit6cc3c6e12bb039047974ad2e7e2d46d15a1b762f (patch)
tree1c3ff8b51757674ead536a3220c0da14608ee267 /kernel/trace/trace_clock.c
parent2395037e5dd6841a6fa23afbb31e79d92e549cd1 (diff)
downloadop-kernel-dev-6cc3c6e12bb039047974ad2e7e2d46d15a1b762f.zip
op-kernel-dev-6cc3c6e12bb039047974ad2e7e2d46d15a1b762f.tar.gz
trace_clock: fix preemption bug
Using the function_graph tracer in recent kernels generates a spew of preemption BUGs. Fix this by not requiring trace_clock_local() users to disable preemption themselves. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace_clock.c')
-rw-r--r--kernel/trace/trace_clock.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/kernel/trace/trace_clock.c b/kernel/trace/trace_clock.c
index 2d4953f..05b176a 100644
--- a/kernel/trace/trace_clock.c
+++ b/kernel/trace/trace_clock.c
@@ -27,12 +27,19 @@
*/
u64 notrace trace_clock_local(void)
{
+ unsigned long flags;
+ u64 clock;
+
/*
* sched_clock() is an architecture implemented, fast, scalable,
* lockless clock. It is not guaranteed to be coherent across
* CPUs, nor across CPU idle events.
*/
- return sched_clock();
+ raw_local_irq_save(flags);
+ clock = sched_clock();
+ raw_local_irq_restore(flags);
+
+ return clock;
}
/*
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