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authorSteven Rostedt <rostedt@goodmis.org>2008-07-15 09:53:37 -0400
committerIngo Molnar <mingo@elte.hu>2008-07-18 18:57:34 +0200
commit1e01cb0c6ff7e9ddb6547551794c6aa82785a7cb (patch)
tree791ecc834a169f6e3d7322a0c285dd95e9cd0c31 /kernel
parente59494f441c834ca7aaa0e6fa6678ddbd3d72743 (diff)
downloadop-kernel-dev-1e01cb0c6ff7e9ddb6547551794c6aa82785a7cb.zip
op-kernel-dev-1e01cb0c6ff7e9ddb6547551794c6aa82785a7cb.tar.gz
ftrace: only trace preempt off with preempt tracer
When PREEMPT_TRACER and IRQSOFF_TRACER are both configured and irqsoff tracer is running, the preempt_off sections might also be traced. Thanks to Andrew Morton for pointing out my mistake of spin_lock disabling interrupts while he was reviewing ftrace.txt. Seems that my example I used actually hit this bug. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_irqsoff.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 421d6fe..b1e4a89 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -337,12 +337,14 @@ EXPORT_SYMBOL(trace_hardirqs_off_caller);
#ifdef CONFIG_PREEMPT_TRACER
void trace_preempt_on(unsigned long a0, unsigned long a1)
{
- stop_critical_timing(a0, a1);
+ if (preempt_trace())
+ stop_critical_timing(a0, a1);
}
void trace_preempt_off(unsigned long a0, unsigned long a1)
{
- start_critical_timing(a0, a1);
+ if (preempt_trace())
+ start_critical_timing(a0, a1);
}
#endif /* CONFIG_PREEMPT_TRACER */
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