linux-kernel - [PATCH 17/20] perf tools: Initialize cpu set in pthread_attr_setaffinity

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Date:	Tue,  3 Mar 2015 00:26:06 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Stephane Eranian <eranian@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-tip-commits@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 17/20] perf tools: Initialize cpu set in pthread_attr_setaffinity_np feature test

From: Adrian Hunter <adrian.hunter@...el.com>

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 2b81b72eca23..fdada5e8d454 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;
-- 
1.9.3

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