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authorSteven Rostedt <srostedt@redhat.com>2011-08-22 09:41:46 -0400
committerSteven Rostedt <rostedt@goodmis.org>2011-08-30 12:27:07 -0400
commit86b6ef21b80ac6565d172cdab4384404de007eea (patch)
tree5156d0d78b4cb0fbbd58ce2281c19f9bba6864f6 /kernel/trace
parent1d0e78e380cd2802aa603a50e08220dfc681141c (diff)
downloadlinux-86b6ef21b80ac6565d172cdab4384404de007eea.tar.bz2
tracing: Add preempt disable for filter self test
The self testing for event filters does not really need preemption disabled as there are no races at the time of testing, but the functions it calls uses rcu_dereference_sched() which will complain if preemption is not disabled. Cc: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace_events_filter.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 6a642e278241..816d3d074979 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -2101,6 +2101,11 @@ static __init int ftrace_test_event_filter(void)
break;
}
+ /*
+ * The preemption disabling is not really needed for self
+ * tests, but the rcu dereference will complain without it.
+ */
+ preempt_disable();
if (*d->not_visited)
walk_pred_tree(filter->preds, filter->root,
test_walk_pred_cb,
@@ -2108,6 +2113,7 @@ static __init int ftrace_test_event_filter(void)
test_pred_visited = 0;
err = filter_match_preds(filter, &d->rec);
+ preempt_enable();
__free_filter(filter);