--- old_rt-tests/src/cyclictest/cyclictest.c	2019-08-14 20:28:48.547725419 +0200
+++ new_rt-tests/src/cyclictest/cyclictest.c	2019-08-14 20:20:58.415297592 +0200
@@ -985,6 +985,7 @@
 	cpu_set_t mask;
 	pthread_t thread;
 	unsigned long smi_now, smi_old;
+        int status;
 
 	/* if we're running in numa mode, set our memory node */
 	if (par->node != -1)
@@ -994,9 +995,9 @@
 		CPU_ZERO(&mask);
 		CPU_SET(par->cpu, &mask);
 		thread = pthread_self();
-		if (pthread_setaffinity_np(thread, sizeof(mask), &mask) == -1)
-			warn("Could not set CPU affinity to CPU #%d\n",
-			     par->cpu);
+		if ((status = pthread_setaffinity_np(thread, sizeof(mask), &mask)) != 0)
+			warn("Could not set CPU affinity to CPU #%d: %s (%d)\n",
+			     par->cpu, strerror(status), status);
 	}
 
 	interval.tv_sec = par->interval / USEC_PER_SEC;