From: Akihiro Nagai <akihiro.nagai.hw@hitachi.com>
Date: Wed, 23 Mar 2011 07:29:39 +0000 (+0900)
Subject: perf top: Fix uninitialized 'counter' variable
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=ce2d17ca7f85dcade62cd608601a0d52ccdaf0e6;p=openwrt%2Fstaging%2Fblogic.git

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@hitachi.com>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <20110323072939.11638.50173.stgit@localhost6.localdomain6>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 70f1075cc5b0..676b4fb0070f 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)