prctl: Add support for PR_SET_THP_DISABLE and PR_GET_THP_DISABLE

Change-Id: I04c5568a9eb78bcac632b734f34bba49cf602c4d
Refs: #1181

test/issues/1181/check_thp.c

@@ -0,0 +1,36 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/prctl.h>
+
+int main(int argc, char *argv[])
+{
+	int rc = 0, ret = 0;
+	int expected_thp = 0;
+
+	if (argc < 2) {
+		printf("err: too few arguments\n");
+		return -1;
+	}
+
+	expected_thp = atoi(argv[1]);
+
+	rc = prctl(PR_GET_THP_DISABLE, 0, 0, 0, 0);
+	if (rc < 0) {
+		perror("err: PR_GET_THP_DISABLE");
+	}
+
+	if (rc == expected_thp) {
+		printf("[ OK ] get thp_disable: %d\n", rc);
+		ret = 0;
+	}
+	else {
+		printf("[ NG ] get thp_disable: %d (expected %d)\n",
+			rc, expected_thp);
+		ret = -1;
+		goto out;
+	}
+
+ out:
+	return ret;
+}