linux-kernel - [PATCH] [RESEND] selftest: intel_pstate: debug support message from aperf.c and return value fix.

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Date:   Tue, 29 May 2018 22:54:36 +0530
From:   Jeffrin Jose T <ahiliation@...il.com>
To:     shuah@...nel.org, kstewart@...uxfoundation.org, tglx@...utronix.de,
        pombredanne@...b.com, gregkh@...uxfoundation.org
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jeffrin Jose T <ahiliation@...il.com>
Subject: [PATCH] [RESEND] selftest: intel_pstate: debug support message from aperf.c and return value fix.

Additional message along with an error message which is more
verbose for debug support from aperf.c and updated with the
new return value "KSFT_SKIP".

Signed-off-by: Jeffrin Jose T [Rajagiri SET] <ahiliation@...il.com>
---
 tools/testing/selftests/intel_pstate/aperf.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/intel_pstate/aperf.c b/tools/testing/selftests/intel_pstate/aperf.c
index d21edea9c560..f6cd03a87493 100644
--- a/tools/testing/selftests/intel_pstate/aperf.c
+++ b/tools/testing/selftests/intel_pstate/aperf.c
@@ -9,6 +9,8 @@
 #include <sys/timeb.h>
 #include <sched.h>
 #include <errno.h>
+#include <string.h>
+#include "../kselftest.h"
 
 void usage(char *name) {
 	printf ("Usage: %s cpunum\n", name);
@@ -41,8 +43,8 @@ int main(int argc, char **argv) {
 	fd = open(msr_file_name, O_RDONLY);
 
 	if (fd == -1) {
-		perror("Failed to open");
-		return 1;
+		printf("/dev/cpu/%d/msr: %s\n", cpu, strerror(errno));
+		return KSFT_SKIP;
 	}
 
 	CPU_ZERO(&cpuset);
-- 
2.17.0