linux-kernel - [tip:perf/urgent] perf tools: Bool functions shouldn't return -1

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Date:	Thu, 17 Sep 2015 22:49:51 -0700
From:	tip-bot for Peter Senna Tschudin <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	kan.liang@...el.com, namhyung@...nel.org, hpa@...or.com,
	linux-kernel@...r.kernel.org, milos@...hat.com, acme@...hat.com,
	peter.senna@...il.com, matt.fleming@...el.com, tglx@...utronix.de,
	rostedt@...dmis.org, a.p.zijlstra@...llo.nl, mingo@...nel.org,
	jolsa@...nel.org
Subject: [tip:perf/urgent] perf tools: Bool functions shouldn't return -1

Commit-ID:  bf6445631c6f00882b25516a174d5073ce0c6f81
Gitweb:     http://git.kernel.org/tip/bf6445631c6f00882b25516a174d5073ce0c6f81
Author:     Peter Senna Tschudin <peter.senna@...il.com>
AuthorDate: Thu, 17 Sep 2015 12:08:53 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 17 Sep 2015 15:31:52 -0300

perf tools: Bool functions shouldn't return -1

Returning a negative value for a boolean function seem to have the
undesired effect of returning true. Replace -1 by false in a
bool-returning function.

The diff of the .s file before and after the change (for x86_64):

  3907c3907
  < 	movl	$1, %ebx
  ---
  > 	xorl	%ebx, %ebx

while if -1 is replaced by true, the diff is empty.

This issue was found by the following Coccinelle semantic patch:

  <smpl>
  @@
  identifier f;
  constant C;
  typedef bool;
  @@
  bool f (...){
  <+...
  * return -C;
  ...+>
  }
  </smpl>

Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Kan Liang <kan.liang@...el.com>
Cc: Matt Fleming <matt.fleming@...el.com>
Cc: Milos Vyletel <milos@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Steven Rostedt <rostedt@...dmis.org>
Link: http://lkml.kernel.org/r/1442484533-19742-1-git-send-email-peter.senna@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 7acafb3..c2cd9bf2 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -709,7 +709,7 @@ bool find_process(const char *name)
 
 	dir = opendir(procfs__mountpoint());
 	if (!dir)
-		return -1;
+		return false;
 
 	/* Walk through the directory. */
 	while (ret && (d = readdir(dir)) != NULL) {
--
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