From 17487bfeb6cfb05920e6a9d5a54f345f2917b4e7 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Mon, 20 Apr 2009 13:24:21 -0400 Subject: [PATCH] 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 --- kernel/trace/ring_buffer.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) 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) -- 2.7.4