Add new perf_buildid_config() into perf_default_config,
bring set_buildid_dir() next to perf_default_config,
rename some variable name as more readable name and etc
in order to clean up code about buildid dir.

Cc: Jiri Olsa <jo...@kernel.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Wang Nan <wangn...@huawei.com>
Signed-off-by: Taeung Song <treeze.tae...@gmail.com>
---
 tools/perf/perf.c        |  3 +--
 tools/perf/util/config.c | 57 +++++++++++++++++++-----------------------------
 2 files changed, 23 insertions(+), 37 deletions(-)

diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index aaee0a7..7b2df2b 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -549,6 +549,7 @@ int main(int argc, const char **argv)
        srandom(time(NULL));
 
        perf_config(perf_default_config, NULL);
+       set_buildid_dir(NULL);
 
        /* get debugfs/tracefs mount point from /proc/mounts */
        tracing_path_mount();
@@ -572,7 +573,6 @@ int main(int argc, const char **argv)
        }
        if (!prefixcmp(cmd, "trace")) {
 #ifdef HAVE_LIBAUDIT_SUPPORT
-               set_buildid_dir(NULL);
                setup_path();
                argv[0] = "trace";
                return cmd_trace(argc, argv, NULL);
@@ -587,7 +587,6 @@ int main(int argc, const char **argv)
        argc--;
        handle_options(&argv, &argc, NULL);
        commit_pager_choice();
-       set_buildid_dir(NULL);
 
        if (argc > 0) {
                if (!prefixcmp(argv[0], "--"))
diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index 4e72763..5c20d78 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -377,6 +377,21 @@ const char *perf_config_dirname(const char *name, const 
char *value)
        return value;
 }
 
+static int perf_buildid_config(const char *var, const char *value)
+{
+       /* same dir for all commands */
+       if (!strcmp(var, "buildid.dir")) {
+               const char *dirname = perf_config_dirname(var, value);
+
+               if (!dirname)
+                       return -1;
+               strncpy(buildid_dir, dirname, MAXPATHLEN-1);
+               buildid_dir[MAXPATHLEN-1] = '\0';
+       }
+
+       return 0;
+}
+
 static int perf_default_core_config(const char *var __maybe_unused,
                                    const char *value __maybe_unused)
 {
@@ -412,6 +427,9 @@ int perf_default_config(const char *var, const char *value,
        if (!prefixcmp(var, "llvm."))
                return perf_llvm_config(var, value);
 
+       if (!prefixcmp(var, "buildid."))
+               return perf_buildid_config(var, value);
+
        /* Add other config variables here. */
        return 0;
 }
@@ -515,49 +533,18 @@ int config_error_nonbool(const char *var)
        return error("Missing value for '%s'", var);
 }
 
-struct buildid_dir_config {
-       char *dir;
-};
-
-static int buildid_dir_command_config(const char *var, const char *value,
-                                     void *data)
-{
-       struct buildid_dir_config *c = data;
-       const char *v;
-
-       /* same dir for all commands */
-       if (!strcmp(var, "buildid.dir")) {
-               v = perf_config_dirname(var, value);
-               if (!v)
-                       return -1;
-               strncpy(c->dir, v, MAXPATHLEN-1);
-               c->dir[MAXPATHLEN-1] = '\0';
-       }
-       return 0;
-}
-
-static void check_buildid_dir_config(void)
-{
-       struct buildid_dir_config c;
-       c.dir = buildid_dir;
-       perf_config(buildid_dir_command_config, &c);
-}
-
 void set_buildid_dir(const char *dir)
 {
        if (dir)
                scnprintf(buildid_dir, MAXPATHLEN-1, "%s", dir);
 
-       /* try config file */
-       if (buildid_dir[0] == '\0')
-               check_buildid_dir_config();
-
        /* default to $HOME/.debug */
        if (buildid_dir[0] == '\0') {
-               char *v = getenv("HOME");
-               if (v) {
+               char *home = getenv("HOME");
+
+               if (home) {
                        snprintf(buildid_dir, MAXPATHLEN-1, "%s/%s",
-                                v, DEBUG_CACHE_DIR);
+                                home, DEBUG_CACHE_DIR);
                } else {
                        strncpy(buildid_dir, DEBUG_CACHE_DIR, MAXPATHLEN-1);
                }
-- 
2.5.0

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