perf trace: Fix show_arg_names not working for tp arg names

trace__fprintf_tp_fields() will always print arg names because when
implemented it is forced to print arg_names with:

  (1 || trace->show_arg_names)

So the printing looks like:

> cat ~/.perfconfig
    [trace]
        show_arg_names = no

> perf trace -e syscalls:*mmap sleep 1
    0.000 sleep/1119 syscalls:sys_enter_mmap(NULL, 8192, READ|WRITE, PRIVATE|ANONYMOUS)
    0.179 sleep/1119 syscalls:sys_exit_mmap(__syscall_nr: 9, ret: 140535426170880)
    ...

Although the comment said that perhaps we need a show_tp_arg_names.

I don't think it's necessary to control them separately because it's not
so clean that part of the log shows arg names but other not.

Also when we are tracing functions it's rare to especially distinguish
syscalls and tp trace.

Only use one option to control arg names printing is more resonable and
simple. So remove the force condition and commit.

After fix:

> perf trace -e syscalls:*mmap sleep 1
    0.000 sleep/1121 syscalls:sys_enter_mmap(NULL, 8192, READ|WRITE, PRIVATE|ANONYMOUS)
    0.163 sleep/1121 syscalls:sys_exit_mmap(9, 140454467661824)
    ...

Fixes: f11b2803bb88655d ("perf trace: Allow choosing how to augment the tracepoint arguments")
Signed-off-by: Chen Zhongjin <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Florian Fischer <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

1 files changed, 1 insertions, 5 deletions

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 3ecc31375f90..99e23e6e6a67 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -2759,11 +2759,7 @@ static size_t trace__fprintf_tp_fields(struct trace *trace, struct evsel *evsel,
 
 		printed += scnprintf(bf + printed, size - printed, "%s", printed ? ", " : "");
 
-		/*
-		 * XXX Perhaps we should have a show_tp_arg_names,
-		 * leaving show_arg_names just for syscalls?
-		 */
-		if (1 || trace->show_arg_names)
+		if (trace->show_arg_names)
 			printed += scnprintf(bf + printed, size - printed, "%s: ", field->name);
 
 		printed += syscall_arg_fmt__scnprintf_val(arg, bf + printed, size - printed, &syscall_arg, val);