selftest: intel_pstate: debug support message from aperf.c and return value

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@gmail.com>
Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>

1 files 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);