Revert "perf test 6: Fix missing kvm module load for s390"

This reverts commit 9a501cdb.

Which was upstream commit 53fe307d.

Ben Hutchings reports that this commit depends on new code added in
v4.18, and so is irrelevant on older kernels, and breaks the build.
Signed-off-by: Sasha Levin <sashal@kernel.org>

tools/perf/tests/parse-events.c

@@ -12,32 +12,6 @@
 #define PERF_TP_SAMPLE_TYPE (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | \
 			     PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD)
 
-#if defined(__s390x__)
-/* Return true if kvm module is available and loaded. Test this
- * and retun success when trace point kvm_s390_create_vm
- * exists. Otherwise this test always fails.
- */
-static bool kvm_s390_create_vm_valid(void)
-{
-	char *eventfile;
-	bool rc = false;
-
-	eventfile = get_events_file("kvm-s390");
-
-	if (eventfile) {
-		DIR *mydir = opendir(eventfile);
-
-		if (mydir) {
-			rc = true;
-			closedir(mydir);
-		}
-		put_events_file(eventfile);
-	}
-
-	return rc;
-}
-#endif
-
 static int test__checkevent_tracepoint(struct perf_evlist *evlist)
 {
 	struct perf_evsel *evsel = perf_evlist__first(evlist);
@@ -1619,7 +1593,6 @@ static struct evlist_test test__events[] = {
 	{
 		.name  = "kvm-s390:kvm_s390_create_vm",
 		.check = test__checkevent_tracepoint,
-		.valid = kvm_s390_create_vm_valid,
 		.id    = 100,
 	},
 #endif