tracing: remove unused local variables in tracer probe functions

When the nsecs_to_usecs() conversion in probe_wakeup_sched_switch() and
check_critical_timing() was moved to a later stage in order to avoid
unnecessary computing, it was overlooked to remove the original
variables, assignments and comments..

Signed-off-by: Carsten Emde <C.Emde@osadl.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

2 files changed, 1 insertions, 21 deletions

diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 5555b75a0d12..06f8ea9e4b9d 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;
@@ -157,17 +152,12 @@ 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;
 
+        tracing_max_latency = delta;
         update_max_tr_single(tr, current, cpu);
 
         max_sequence++;
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index cf43bdb1763a..6e1529bc6172 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -110,7 +110,6 @@ static void notrace
 probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev,
         struct task_struct *next)
 {
-        unsigned long latency = 0, t0 = 0, t1 = 0;
         struct trace_array_cpu *data;
         cycle_t T0, T1, delta;
         unsigned long flags;
@@ -156,10 +155,6 @@ probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev,
         trace_function(wakeup_trace, CALLER_ADDR0, CALLER_ADDR1, flags, pc);
         tracing_sched_switch_trace(wakeup_trace, prev, next, flags, 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;
@@ -167,12 +162,7 @@ probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev,
         if (!report_latency(delta))
                 goto out_unlock;
 
-        latency = nsecs_to_usecs(delta);
-
         tracing_max_latency = delta;
-        t0 = nsecs_to_usecs(T0);
-        t1 = nsecs_to_usecs(T1);
-
         update_max_tr(wakeup_trace, wakeup_task, wakeup_cpu);
 
 out_unlock: