cgroups: use simple_malloc()/simple_free()

index 358e775..349ec9a 100644
@@ -2167,7 +2167,7 @@ static void release_cgroup_pid_array(struct cgroup *cgrp)
 	down_write(&cgrp->pids_mutex);
 	BUG_ON(!cgrp->pids_use_count);
 	if (!--cgrp->pids_use_count) {
-		kfree(cgrp->tasks_pids);
+		simple_free(cgrp->tasks_pids);
 		cgrp->tasks_pids = NULL;
 		cgrp->pids_length = 0;
 	}

@@ -2215,7 +2215,7 @@ static int cgroup_tasks_open(struct inode *unused, struct file *file)
 	 * show up until sometime later on.
 	 */
 	npids = cgroup_task_count(cgrp);
-	pidarray = kmalloc(npids * sizeof(pid_t), GFP_KERNEL);
+	pidarray = simple_malloc(npids * sizeof(pid_t));
 	if (!pidarray)
 		return -ENOMEM;
 	npids = pid_array_load(pidarray, npids, cgrp);