linux-kernel - [tip:perf/urgent] perf evlist: Explicititely initialize input

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Message-ID: <tip-5e8wolcjs3rgd5i6yi995gfh@git.kernel.org>
Date:	Thu, 24 May 2012 03:37:35 -0700
From:	tip-bot for Arnaldo Carvalho de Melo <acme@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, paulus@...ba.org,
	acme@...hat.com, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, efault@....de, namhyung@...il.com,
	fweisbec@...il.com, dsahern@...il.com, tglx@...utronix.de
Subject: [tip:perf/urgent] perf evlist: Explicititely initialize input_name

Commit-ID:  a1d44b9acdf7b2820ef762846150b4d13b84e075
Gitweb:     http://git.kernel.org/tip/a1d44b9acdf7b2820ef762846150b4d13b84e075
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Wed, 23 May 2012 21:47:51 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 23 May 2012 21:47:51 -0300

perf evlist: Explicititely initialize input_name

It was a global variable, so it was initialized, implicitely, to zero by
being placed in the bss.

Now it is just a local variable that is then passed to the __cmd_evlist
routine, so it must be explicitely set to NULL.

The problem manifested on a Fedora 17 system, using:

 gcc version 4.7.0 20120507 (Red Hat 4.7.0-5) (GCC)

But not on several other systems, by luck.

Reported-by: Ingo Molnar <mingo@...nel.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Mike Galbraith <efault@....de>
Cc: Namhyung Kim <namhyung@...il.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-5e8wolcjs3rgd5i6yi995gfh@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-evlist.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-evlist.c b/tools/perf/builtin-evlist.c
index e52d77e..acd78dc 100644
--- a/tools/perf/builtin-evlist.c
+++ b/tools/perf/builtin-evlist.c
@@ -116,7 +116,7 @@ static const char * const evlist_usage[] = {
 int cmd_evlist(int argc, const char **argv, const char *prefix __used)
 {
 	struct perf_attr_details details = { .verbose = false, };
-	const char *input_name;
+	const char *input_name = NULL;
 	const struct option options[] = {
 		OPT_STRING('i', "input", &input_name, "file",
 			    "Input file name"),
--
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