From: Daniel Bristot de Oliveira bristot@kernel.org
commit d3cba7f02cd82118c32651c73374d8a5a459d9a6 upstream.
osnoise/timerlat tracers are reporting new max latency on instances where the tracing is off, creating inconsistencies between the max reported values in the trace and in the tracing_max_latency. Thus only report new tracing_max_latency on active tracing instances.
Link: https://lkml.kernel.org/r/ecd109fde4a0c24ab0f00ba1e9a144ac19a91322.168010418...
Cc: stable@vger.kernel.org Fixes: dae181349f1e ("tracing/osnoise: Support a list of trace_array *tr") Signed-off-by: Daniel Bristot de Oliveira bristot@kernel.org Signed-off-by: Steven Rostedt (Google) rostedt@goodmis.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- kernel/trace/trace_osnoise.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/trace/trace_osnoise.c +++ b/kernel/trace/trace_osnoise.c @@ -1270,7 +1270,7 @@ static void notify_new_max_latency(u64 l rcu_read_lock(); list_for_each_entry_rcu(inst, &osnoise_instances, list) { tr = inst->tr; - if (tr->max_latency < latency) { + if (tracer_tracing_is_on(tr) && tr->max_latency < latency) { tr->max_latency = latency; latency_fsnotify(tr); }