linux-kernel - [tip:perf/urgent] perf top: Fix uninitialized 'counter' variable

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Date:	Wed, 23 Mar 2011 09:43:16 GMT
From:	tip-bot for Akihiro Nagai <akihiro.nagai.hw@...achi.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulus@...ba.org, hpa@...or.com,
	mingo@...hat.com, akihiro.nagai.hw@...achi.com,
	peterz@...radead.org, masami.hiramatsu.pt@...achi.com,
	acme@...radead.org, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/urgent] perf top: Fix uninitialized 'counter' variable

Commit-ID:  ce2d17ca7f85dcade62cd608601a0d52ccdaf0e6
Gitweb:     http://git.kernel.org/tip/ce2d17ca7f85dcade62cd608601a0d52ccdaf0e6
Author:     Akihiro Nagai <akihiro.nagai.hw@...achi.com>
AuthorDate: Wed, 23 Mar 2011 16:29:39 +0900
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 23 Mar 2011 10:38:32 +0100

perf top: Fix uninitialized 'counter' variable

builtin-top.c has an uninitialized variable.
gcc(version 4.5.1) warns about it and it results in build failure:

 builtin-top.c: In function 'display_thread':
 builtin-top.c:518:9: error: 'counter' may be used uninitialized

This situation can indeed trigger, if the getline() call in
prompt_integer() fails.

Signed-off-by: Akihiro Nagai <akihiro.nagai.hw@...achi.com>
Cc: Arnaldo Carvalho de Melo <acme@...radead.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
LKML-Reference: <20110323072939.11638.50173.stgit@...alhost6.localdomain6>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 tools/perf/builtin-top.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 70f1075..676b4fb 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -515,7 +515,9 @@ static void handle_keypress(struct perf_session *session, int c)
 			break;
 		case 'E':
 			if (top.evlist->nr_entries > 1) {
-				int counter;
+				/* Select 0 as the default event: */
+				int counter = 0;
+
 				fprintf(stderr, "\nAvailable events:");
 
 				list_for_each_entry(top.sym_evsel, &top.evlist->entries, node)
--
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