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>

diff --git a/tools/testing/selftests/intel_pstate/aperf.c b/tools/testing/selftests/intel_pstate/aperf.c
index d21edea..f6cd03a 100644 (file)
--- 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);