[PATCH] perf buildid-cache: Warn --purge-all failures

[Ravi Bangoria]

Warn perf buildid-cache --purge-all failures in non verbose mode.
Ex,

  $ sudo chown root:root /home/ravi/.debug -R
  $ ./perf buildid-cache -P
    Error: Permission denied.

Suggested-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Signed-off-by: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxx>
---
 tools/perf/builtin-buildid-cache.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-buildid-cache.c b/tools/perf/builtin-buildid-cache.c
index 7a7403913b57..ef6b3cc8d57d 100644
--- a/tools/perf/builtin-buildid-cache.c
+++ b/tools/perf/builtin-buildid-cache.c
@@ -488,8 +488,12 @@ int cmd_buildid_cache(int argc, const char **argv)
 		}
 	}
 
-	if (purge_all)
-		ret = build_id_cache__purge_all();
+	if (purge_all) {
+		if (build_id_cache__purge_all()) {
+			pr_warning("Error: %s.\n",
+				str_error_r(errno, sbuf, sizeof(sbuf)));
+		}
+	}
 
 	if (missing_filename)
 		ret = build_id_cache__fprintf_missing(session, stdout);
-- 
2.14.3