selftests/ftrace: Use loopback address instead of localhost

Use raw loopback address instead of localhost, because
"localhost" can depend on nsswitch and in some case
we can not resolve the localhost.
Signed-off-by: NMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: NShuah Khan (Samsung OSG) <shuah@kernel.org>

tools/testing/selftests/ftrace/test.d/event/event-enable.tc

@@ -13,10 +13,6 @@ fail() { #msg
     exit_fail
 }
 
-yield() {
-    ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1
-}
-
 if [ ! -f set_event -o ! -d events/sched ]; then
     echo "event tracing is not supported"
     exit_unsupported

tools/testing/selftests/ftrace/test.d/event/event-pid.tc

@@ -16,10 +16,6 @@ fail() { #msg
     exit_fail
 }
 
-yield() {
-    ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1
-}
-
 if [ ! -f set_event -o ! -d events/sched ]; then
     echo "event tracing is not supported"
     exit_unsupported

tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc

@@ -13,10 +13,6 @@ fail() { #msg
     exit_fail
 }
 
-yield() {
-    ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1
-}
-
 if [ ! -f set_event -o ! -d events/sched ]; then
     echo "event tracing is not supported"
     exit_unsupported

tools/testing/selftests/ftrace/test.d/event/toplevel-enable.tc

@@ -12,10 +12,6 @@ fail() { #msg
     exit_fail
 }
 
-yield() {
-    ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1
-}
-
 if [ ! -f available_events -o ! -f set_event -o ! -d events ]; then
     echo "event tracing is not supported"
     exit_unsupported

tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc

@@ -48,10 +48,6 @@ fail() { # msg
     exit_fail
 }
 
-yield() {
-    ping localhost -c 1 || sleep .001 || usleep 1 || sleep 1
-}
-
 do_test() {
     disable_tracing
 

tools/testing/selftests/ftrace/test.d/functions

@@ -103,3 +103,9 @@ initialize_ftrace() { # Reset ftrace to initial-state
     clear_trace
     enable_tracing
 }
+
+LOCALHOST=127.0.0.1
+
+yield() {
+    ping $LOCALHOST -c 1 || sleep .001 || usleep 1 || sleep 1
+}

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-field-variable-support.tc

@@ -23,7 +23,7 @@ echo 'hist:keys=comm:ts0=common_timestamp.usecs if comm=="ping"' > events/sched/
 echo 'hist:keys=next_comm:wakeup_lat=common_timestamp.usecs-$ts0:onmatch(sched.sched_waking).wakeup_latency($wakeup_lat,next_pid,sched.sched_waking.prio,next_comm) if next_comm=="ping"' > events/sched/sched_switch/trigger
 echo 'hist:keys=pid,prio,comm:vals=lat:sort=pid,prio' > events/synthetic/wakeup_latency/trigger
 
-ping localhost -c 3
+ping $LOCALHOST -c 3
 if ! grep -q "ping" events/synthetic/wakeup_latency/hist; then
     fail "Failed to create inter-event histogram"
 fi

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-inter-event-combined-hist.tc

@@ -37,7 +37,7 @@ echo 'waking+wakeup_latency u64 lat; pid_t pid' >> synthetic_events
 echo 'hist:keys=pid,lat:sort=pid,lat:ww_lat=$waking_lat+$wakeup_lat:onmatch(synthetic.wakeup_latency).waking+wakeup_latency($ww_lat,pid)' >> events/synthetic/wakeup_latency/trigger
 echo 'hist:keys=pid,lat:sort=pid,lat' >> events/synthetic/waking+wakeup_latency/trigger
 
-ping localhost -c 3
+ping $LOCALHOST -c 3
 if ! grep -q "pid:" events/synthetic/waking+wakeup_latency/hist; then
     fail "Failed to create combined histogram"
 fi

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-onmatch-action-hist.tc

@@ -29,7 +29,8 @@ echo "Test histogram variables,simple expression support and onmatch action"
 echo 'hist:keys=pid:ts0=common_timestamp.usecs if comm=="ping"' > events/sched/sched_wakeup/trigger
 echo 'hist:keys=next_pid:wakeup_lat=common_timestamp.usecs-$ts0:onmatch(sched.sched_wakeup).wakeup_latency($wakeup_lat,next_pid,next_comm) if next_comm=="ping"' > events/sched/sched_switch/trigger
 echo 'hist:keys=comm,pid,lat:wakeup_lat=lat:sort=lat' > events/synthetic/wakeup_latency/trigger
-ping localhost -c 5
+
+ping $LOCALHOST -c 5
 if ! grep -q "ping" events/synthetic/wakeup_latency/hist; then
     fail "Failed to create onmatch action inter-event histogram"
 fi

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-onmatch-onmax-action-hist.tc

@@ -29,7 +29,8 @@ echo "Test histogram variables,simple expression support and onmatch-onmax actio
 echo 'hist:keys=pid:ts0=common_timestamp.usecs if comm=="ping"' > events/sched/sched_wakeup/trigger
 echo 'hist:keys=next_pid:wakeup_lat=common_timestamp.usecs-$ts0:onmatch(sched.sched_wakeup).wakeup_latency($wakeup_lat,next_pid,next_comm):onmax($wakeup_lat).save(next_comm,prev_pid,prev_prio,prev_comm) if next_comm=="ping"' >> events/sched/sched_switch/trigger
 echo 'hist:keys=comm,pid,lat:wakeup_lat=lat:sort=lat' > events/synthetic/wakeup_latency/trigger
-ping localhost -c 5
+
+ping $LOCALHOST -c 5
 if [ ! grep -q "ping" events/synthetic/wakeup_latency/hist -o ! grep -q "max:" events/sched/sched_switch/hist]; then
     fail "Failed to create onmatch-onmax action inter-event histogram"
 fi

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-onmax-action-hist.tc

@@ -27,7 +27,8 @@ echo "Test onmax action"
 
 echo 'hist:keys=pid:ts0=common_timestamp.usecs if comm=="ping"' >> events/sched/sched_waking/trigger
 echo 'hist:keys=next_pid:wakeup_lat=common_timestamp.usecs-$ts0:onmax($wakeup_lat).save(next_comm,prev_pid,prev_prio,prev_comm) if next_comm=="ping"' >> events/sched/sched_switch/trigger
-ping localhost -c 3
+
+ping $LOCALHOST -c 3
 if ! grep -q "max:" events/sched/sched_switch/hist; then
     fail "Failed to create onmax action inter-event histogram"
 fi