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Subject[PATCH tip 1/1] tracing: handle unregistering the current tracer
Impact: simplification

Instead of requiring that plugins have the sequence:

my_tracer_stop(my_trace_array);
unregister_tracer(my_tracer);

it should be possible just do a:

unregister_tracer(my_tracer);

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
kernel/trace/trace.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ef4dbac..d247555 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -559,6 +559,15 @@ void unregister_tracer(struct tracer *type)

found:
*t = (*t)->next;
+
+ if (type == current_trace && tracer_enabled) {
+ tracer_enabled = 0;
+ tracing_stop();
+ if (current_trace->stop)
+ current_trace->stop(&global_trace);
+ current_trace = &nop_trace;
+ }
+
if (strlen(type->name) != max_tracer_type_len)
goto out;

--
1.6.0.6


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