perf config: Show the configuration when no arguments are provided

More convenient thah having to recall what letter is about
showing/listing/dumping the configuration, i.e. no arguments means
-l/--list:

  # perf config
  llvm.dump-obj=true
  trace.default_events=/home/acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.o
  trace.show_zeros=yes
  trace.show_duration=no
  # perf config -l
  llvm.dump-obj=true
  trace.default_events=/home/acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.o
  trace.show_zeros=yes
  trace.show_duration=no
  # perf config -h

   Usage: perf config [<file-option>] [options] [section.name[=value] ...]

      -l, --list            show current config variables
          --system          use system config file
          --user            use user config file

  #

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Taeung Song <treeze.taeung@gmail.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-z2n63avz6tliqb5gmu4l1dti@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index 514f70f..d76f831 100644 (file)
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -196,6 +196,7 @@ int cmd_config(int argc, const char **argv)
                        pr_err("Error: takes no arguments\n");
                        parse_options_usage(config_usage, config_options, "l", 1);
                } else {
+do_action_list:
                        if (show_config(set) < 0) {
                                pr_err("Nothing configured, "
                                       "please check your %s \n", config_filename);
@@ -204,10 +205,8 @@ int cmd_config(int argc, const char **argv)
                }
                break;
        default:
-               if (!argc) {
-                       usage_with_options(config_usage, config_options);
-                       break;
-               }
+               if (!argc)
+                       goto do_action_list;
 
                for (i = 0; argv[i]; i++) {
                        char *var, *value;