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

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Date:	Mon, 02 Mar 2015 09:59:05 +0200
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	acme@...hat.com
CC:	Ingo Molnar <mingo@...nel.org>, hpa@...or.com, eranian@...gle.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de, jolsa@...hat.com,
	linux-tip-commits@...r.kernel.org
Subject: [PATCH] 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>
---
 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;
-- 
1.9.1


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