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authorSteven Rostedt <srostedt@redhat.com>2009-04-20 13:24:21 -0400
committerSteven Rostedt <rostedt@goodmis.org>2009-04-20 13:24:21 -0400
commit17487bfeb6cfb05920e6a9d5a54f345f2917b4e7 (patch)
tree23064df0a7814788823484098450cb2924ff9a34 /kernel/trace/ring_buffer.c
parent23de29de2d8b227943be191d59fb6d983996d55e (diff)
downloadop-kernel-dev-17487bfeb6cfb05920e6a9d5a54f345f2917b4e7.zip
op-kernel-dev-17487bfeb6cfb05920e6a9d5a54f345f2917b4e7.tar.gz
tracing: fix recursive test level calculation
The recursive tests to detect same level recursion in the ring buffers did not account for the hard/softirq_counts to be shifted. Thus the numbers could be larger than then mask to be tested. This patch includes the shift for the calculation of the irq depth. [ Impact: stop false positives in trace recursion detection ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/ring_buffer.c')
-rw-r--r--kernel/trace/ring_buffer.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index e145969..aa40ae9 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -1483,7 +1483,9 @@ rb_reserve_next_event(struct ring_buffer_per_cpu *cpu_buffer,
static int trace_irq_level(void)
{
- return hardirq_count() + softirq_count() + in_nmi();
+ return (hardirq_count() >> HARDIRQ_SHIFT) +
+ (softirq_count() >> + SOFTIRQ_SHIFT) +
+ !!in_nmi();
}
static int trace_recursive_lock(void)
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