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Date:   Sat, 18 Nov 2017 00:32:25 -0800
From:   tip-bot for Namhyung Kim <>
Subject: [tip:perf/core] perf help: Fix a bug during strstart() conversion

Commit-ID:  2f0af8600e82e9f950fc32908386b9c639f88d48
Author:     Namhyung Kim <>
AuthorDate: Tue, 14 Nov 2017 09:15:42 +0900
Committer:  Arnaldo Carvalho de Melo <>
CommitDate: Thu, 16 Nov 2017 14:49:59 -0300

perf help: Fix a bug during strstart() conversion

The commit 8e99b6d4533c changed prefixcmp() to strstart() but missed to
change the return value in some place.  It makes perf help print
annoying output even for sane config items like below:

  $ perf help
  '.root': unsupported man viewer sub key.

Reported-by: Arnaldo Carvalho de Melo <>
Signed-off-by: Namhyung Kim <>
Tested-by: Arnaldo Carvalho de Melo <>
Tested-by: Taeung Song <>
Cc: Jiri Olsa <>
Cc: Sihyeon Jang <>
Fixes: 8e99b6d4533c ("tools include: Adopt strstarts() from the kernel")
Signed-off-by: Arnaldo Carvalho de Melo <>
 tools/perf/builtin-help.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c
index bd1fede..a0f7ed2 100644
--- a/tools/perf/builtin-help.c
+++ b/tools/perf/builtin-help.c
@@ -284,7 +284,7 @@ static int perf_help_config(const char *var, const char *value, void *cb)
 		return 0;
-	if (!strstarts(var, "man."))
+	if (strstarts(var, "man."))
 		return add_man_viewer_info(var, value);
 	return 0;
@@ -314,7 +314,7 @@ static const char *cmd_to_page(const char *perf_cmd)
 	if (!perf_cmd)
 		return "perf";
-	else if (!strstarts(perf_cmd, "perf"))
+	else if (strstarts(perf_cmd, "perf"))
 		return perf_cmd;
 	return asprintf(&s, "perf-%s", perf_cmd) < 0 ? NULL : s;

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