[PATCH 1/3] tracing: Restore proper field flag printing when displaying triggers

[Tom Zanussi]

The flag-printing code used when displaying hist triggers somehow got
dropped during refactoring of the inter-event patchset.  This restores
it.

Below are a couple examples - in the first case, .usecs wasn't being
displayed properly for common_timestamps and the second illustrates
the same for other flags such as .execname.

Before:

  # echo 'hist:key=common_pid.execname:val=count:sort=count' > 
/sys/kernel/debug/tracing/events/syscalls/sys_enter_read/trigger
  # cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/trigger
  hist:keys=common_pid:vals=hitcount,count:sort=count:size=2048 [active]

  # echo 'hist:keys=pid:ts0=common_timestamp.usecs if comm=="cyclictest"' >> 
/sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger
  # cat /sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger
  
hist:keys=pid:vals=hitcount:ts0=common_timestamp:sort=hitcount:size=2048:clock=global
 if comm=="cyclictest" [active]

After:

  # echo 'hist:key=common_pid.execname:val=count:sort=count' > 
/sys/kernel/debug/tracing/events/syscalls/sys_enter_read/trigger
  # cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/trigger
  hist:keys=common_pid.execname:vals=hitcount,count:sort=count:size=2048 
[active]

  # echo 'hist:keys=pid:ts0=common_timestamp.usecs if comm=="cyclictest"' >> 
/sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger
  # cat /sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger
  
hist:keys=pid:vals=hitcount:ts0=common_timestamp.usecs:sort=hitcount:size=2048:clock=global
 if comm=="cyclictest" [active]

Signed-off-by: Tom Zanussi <tom.zanu...@linux.intel.com>
---
 kernel/trace/trace_events_hist.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 0d7b3ff..66c87be 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -4913,6 +4913,16 @@ static void hist_field_print(struct seq_file *m, struct 
hist_field *hist_field)
                seq_printf(m, "%s", field_name);
        } else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
                seq_puts(m, "common_timestamp");
+
+       if (hist_field->flags) {
+               if (!(hist_field->flags & HIST_FIELD_FL_VAR_REF) &&
+                   !(hist_field->flags & HIST_FIELD_FL_EXPR)) {
+                       const char *flags = get_hist_field_flags(hist_field);
+
+                       if (flags)
+                               seq_printf(m, ".%s", flags);
+               }
+       }
 }
 
 static int event_hist_trigger_print(struct seq_file *m,
-- 
1.9.3