+	ret = cpulist_parse(buf, newmask);
+	if (!ret) {
+		spin_lock(&bdi->wb_lock);
+		task = wb->task;
+		get_task_struct(task);
+		spin_unlock(&bdi->wb_lock);
+		if (task)
+			ret = set_cpus_allowed_ptr(task, newmask);
+		put_task_struct(task);

If that test for a non-null task is needed then surely the get and put
need to be similarly protected :).

+		bdi->flusher_cpumask = kmalloc(sizeof(cpumask_t), GFP_KERNEL);
+		if (!bdi->flusher_cpumask)
+			return -ENOMEM;

The bare GFP_KERNEL raises an eyebrow.  Some bdi_init() callers like
blk_alloc_queue_node() look like they'll want to pass in a gfp_t for the
allocation.

And shouldn't this be freed in the error path of bdi_init()?

- z

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