1 files changed, 5 insertions, 14 deletions

diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index b923d13e2fad..3aa7eaa2114c 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -129,15 +129,10 @@ check_critical_timing(struct trace_array *tr,
                       unsigned long parent_ip,
                       int cpu)
 {
-        unsigned long latency, t0, t1;
         cycle_t T0, T1, delta;
         unsigned long flags;
         int pc;
 
-        /*
-         * usecs conversion is slow so we try to delay the conversion
-         * as long as possible:
-         */
         T0 = data->preempt_timestamp;
         T1 = ftrace_now(cpu);
         delta = T1-T0;
@@ -157,18 +152,15 @@ check_critical_timing(struct trace_array *tr,
 
         trace_function(tr, CALLER_ADDR0, parent_ip, flags, pc);
 
-        latency = nsecs_to_usecs(delta);
-
         if (data->critical_sequence != max_sequence)
                 goto out_unlock;
 
-        tracing_max_latency = delta;
-        t0 = nsecs_to_usecs(T0);
-        t1 = nsecs_to_usecs(T1);
-
         data->critical_end = parent_ip;
 
-        update_max_tr_single(tr, current, cpu);
+        if (likely(!is_tracing_stopped())) {
+                tracing_max_latency = delta;
+                update_max_tr_single(tr, current, cpu);
+        }
 
         max_sequence++;
 
@@ -178,7 +170,6 @@ out_unlock:
 out:
         data->critical_sequence = max_sequence;
         data->preempt_timestamp = ftrace_now(cpu);
-        tracing_reset(tr, cpu);
         trace_function(tr, CALLER_ADDR0, parent_ip, flags, pc);
 }
 
@@ -208,7 +199,6 @@ start_critical_timing(unsigned long ip, unsigned long parent_ip)
         data->critical_sequence = max_sequence;
         data->preempt_timestamp = ftrace_now(cpu);
         data->critical_start = parent_ip ? : ip;
-        tracing_reset(tr, cpu);
 
         local_save_flags(flags);
 
@@ -379,6 +369,7 @@ static void __irqsoff_tracer_init(struct trace_array *tr)
         irqsoff_trace = tr;
         /* make sure that the tracer is visible */
         smp_wmb();
+        tracing_reset_online_cpus(tr);
         start_irqsoff_tracer(tr);
 }