Add a cpuset exit function

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.c b/fio.c
index a11f2bb..2a468b1 100644
--- a/fio.c
+++ b/fio.c
@@ -970,10 +970,6 @@
 	 * thread from this job
 	 */
 	if (td->o.gtod_cpu) {
-		if (fio_getaffinity(td->pid, &td->o.cpumask) == -1) {
-			td_verror(td, errno, "cpu_get_affinity");
-			goto err;
-		}
 		fio_cpu_clear(&td->o.cpumask, td->o.gtod_cpu);
 		if (fio_setaffinity(td) == -1) {
 			td_verror(td, errno, "cpu_set_affinity");
@@ -1120,6 +1116,9 @@
 	close_ioengine(td);
 	cleanup_io_u(td);
 
+	if (td->o.cpumask_set)
+		fio_cpuset_exit(td);
+
 	/*
 	 * do this very late, it will log file closing as well
 	 */
diff --git a/os/os-linux.h b/os/os-linux.h
index ea2db9b..3338046 100644
--- a/os/os-linux.h
+++ b/os/os-linux.h
@@ -35,11 +35,8 @@
 #define CLOCK_MONOTONIC 1
 #endif
 
-#ifdef FIO_HAVE_CPU_AFFINITY
 typedef cpu_set_t os_cpu_mask_t;
-#else
-typedef int os_cpu_mask_t;
-#endif
+
 typedef struct drand48_data os_random_state_t;
 
 /*
@@ -69,6 +66,7 @@
 #define fio_cpu_clear(mask, cpu)	CPU_CLR((cpu), (mask))
 #define fio_cpu_set(mask, cpu)		CPU_SET((cpu), (mask))
 #define fio_cpuset_init(td)		CPU_ZERO(&(td)->o.cpumask)
+#define fio_cpuset_exit(td)		do { } while (0)
 
 #define FIO_MAX_CPUS			CPU_SETSIZE