[tip:perf/urgent] perf stat: Fix CVS output format for non-supported counters

[tip-bot for Ilya Pronin]

Commit-ID:  40c21898ba5372c14ef71717040529794a91ccc2
Gitweb:     https://git.kernel.org/tip/40c21898ba5372c14ef71717040529794a91ccc2
Author:     Ilya Pronin <ipronin@xxxxxxxxxxx>
AuthorDate: Mon, 5 Mar 2018 22:43:53 -0800
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 6 Mar 2018 10:53:52 -0300

perf stat: Fix CVS output format for non-supported counters

When printing stats in CSV mode, 'perf stat' appends extra separators
when a counter is not supported:

<not supported>,,L1-dcache-store-misses,mesos/bd442f34-2b4a-47df-b966-9b281f9f56fc,0,100.00,,,,

Which causes a failure when parsing fields. The numbers of separators
should be the same for each line, no matter if the counter is or not
supported.

Signed-off-by: Ilya Pronin <ipronin@xxxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20180306064353.31930-1-xiyou.wangcong@xxxxxxxxx
Fixes: 92a61f6412d3 ("perf stat: Implement CSV metrics output")
Signed-off-by: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/builtin-stat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 98bf9d32f222..54a4c152edb3 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -917,7 +917,7 @@ static void print_metric_csv(void *ctx,
 	char buf[64], *vals, *ends;
 
 	if (unit == NULL || fmt == NULL) {
-		fprintf(out, "%s%s%s%s", csv_sep, csv_sep, csv_sep, csv_sep);
+		fprintf(out, "%s%s", csv_sep, csv_sep);
 		return;
 	}
 	snprintf(buf, sizeof(buf), fmt, val);