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tracing: use nowakeup version of commit for function event trace tests

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The startup tests for the event tracer also runs with the function
tracer enabled. The "wakeup" version of the trace commit was used
which can grab spinlocks. If a task was preempted by an NMI
that called a function being traced, it could deadlock due to the
function tracer trying to grab the same lock.

Thanks to Frederic Weisbecker for pointing out where the bug was.

Reported-by: Ingo Molnar <mingo@elte.hu>
Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2009-04-20 18:16:44 -04:00 committed by Steven Rostedt
parent aa18efb2a2
commit cb4764a6db
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace_events.c
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@ -1164,7 +1164,7 @@ function_test_events_call(unsigned long ip, unsigned long parent_ip)
entry->ip = ip;
entry->parent_ip = parent_ip;
trace_current_buffer_unlock_commit(event, flags, pc);
trace_nowake_buffer_unlock_commit(event, flags, pc);
out:
atomic_dec(&per_cpu(test_event_disable, cpu));