[PATCH v3 7/7] perf config: Reset the config set at only 'config' sub-command

[Taeung Song]

When first calling perf_config(), config set is
initialized collecting both user and system config files
(i.e. user config ~/.perfconfig and system config
$(sysconfdir)/perfconfig) so config set contains
not only user config but also system config key-value pairs.
(User config has higher priority than system config.)

But 'config' sub-command have '--user' or '--system' options.
The options is to select a particular config file location
so the config set should be reset before 'config' sub-command work.

User config file:

    # cat ~/.perfconfig
    [annotate]
        hide_src_code = false
    [tui]
        report = on

System config file:

    # cat /usr/local/etc/perfconfig
    [annotate]
        hide_src_code = true

Before:

    # perf config --user --list
    annotate.hide_src_code=false
    ui.report=on

    # perf config --system --list
    annotate.hide_src_code=false
    tui.report=on

After:

    # perf config --user --list
    annotate.hide_src_code=false
    tui.report=on

    # perf config --system --list
    annotate.hide_src_code=true

Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Signed-off-by: Taeung Song <treeze.taeung@xxxxxxxxx>
---
 tools/perf/builtin-config.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index 412c725..5615631 100644
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -64,6 +64,12 @@ int cmd_config(int argc, const char **argv, const char *prefix __maybe_unused)
 	else if (use_user_config)
 		config_exclusive_filename = user_config;
 
+	/*
+	 * Reset the config set at only 'config' sub-command
+	 * because of options config file location.
+	 */
+	perf_config_set__delete();
+
 	switch (actions) {
 	case ACTION_LIST:
 		if (argc) {
-- 
2.5.0