[PATCH 18/21] tracing: Fix preemptirqsoff tracer to not stop at preempt off

Steven Rostedt
2011-09-22T22:11:41Z

[-- Attachment #1: 0018-tracing-Fix-preemptirqsoff-tracer-to-not-stop-at-pre.patch --]
[-- Type: text/plain, Size: 1065 bytes --]

From: Steven Rostedt <srostedt@redhat.com>

If irqs are disabled when preemption count reaches zero, the
preemptirqsoff tracer should not flag that as the end.

When interrupts are enabled and preemption count is not zero
the preemptirqsoff correctly continues its tracing.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
kernel/trace/trace_irqsoff.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 667aa8c..a1a3359 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -505,13 +505,13 @@ EXPORT_SYMBOL(trace_hardirqs_off_caller);
#ifdef CONFIG_PREEMPT_TRACER
void trace_preempt_on(unsigned long a0, unsigned long a1)
{
- if (preempt_trace())
+ if (preempt_trace() && !irq_trace())
stop_critical_timing(a0, a1);
}

void trace_preempt_off(unsigned long a0, unsigned long a1)
{
- if (preempt_trace())
+ if (preempt_trace() && !irq_trace())
start_critical_timing(a0, a1);
}
#endif /* CONFIG_PREEMPT_TRACER */
--
1.7.5.4