linux-kernel - [tip:perf/core] perf tools: Initialize cpu set in pthread_attr_setaffinity

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Date:	Mon, 2 Mar 2015 22:26:28 -0800
From:	tip-bot for Adrian Hunter <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	adrian.hunter@...el.com, mingo@...nel.org, tglx@...utronix.de,
	acme@...hat.com, linux-kernel@...r.kernel.org, eranian@...gle.com,
	hpa@...or.com
Subject: [tip:perf/core] perf tools:
  Initialize cpu set in pthread_attr_setaffinity_np feature test

Commit-ID:  543d976fa2ebf5543bd07b5d487bf3a6144c0886
Gitweb:     http://git.kernel.org/tip/543d976fa2ebf5543bd07b5d487bf3a6144c0886
Author:     Adrian Hunter <adrian.hunter@...el.com>
AuthorDate: Mon, 2 Mar 2015 09:59:05 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 2 Mar 2015 12:48:16 -0300

perf tools: Initialize cpu set in pthread_attr_setaffinity_np feature test

Feature tests are compiled but not executed, however it might avoid a
future uninitialized variable warning, so initialize the cpu set.

Reported-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-tip-commits@...r.kernel.org
Link: http://lkml.kernel.org/r/54F41849.1010906@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/config/feature-checks/test-pthread-attr-setaffinity-np.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/config/feature-checks/test-pthread-attr-setaffinity-np.c b/tools/perf/config/feature-checks/test-pthread-attr-setaffinity-np.c
index 2b81b72..fdada5e 100644
--- a/tools/perf/config/feature-checks/test-pthread-attr-setaffinity-np.c
+++ b/tools/perf/config/feature-checks/test-pthread-attr-setaffinity-np.c
@@ -1,5 +1,6 @@
 #include <stdint.h>
 #include <pthread.h>
+#include <sched.h>
 
 int main(void)
 {
@@ -8,7 +9,8 @@ int main(void)
 	cpu_set_t cs;
 
 	pthread_attr_init(&thread_attr);
-	/* don't care abt exact args, just the API itself in libpthread */
+	CPU_ZERO(&cs);
+
 	ret = pthread_attr_setaffinity_np(&thread_attr, sizeof(cs), &cs);
 
 	return ret;
--
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