Merge branches 'work.namei', 'work.dcache' and 'work.iov_iter' into for-linus

kernel/printk/printk.c

@@ -748,7 +748,7 @@ static ssize_t devkmsg_write(struct kiocb *iocb, struct iov_iter *from)
 		return -ENOMEM;
 
 	buf[len] = '\0';
-	if (copy_from_iter(buf, len, from) != len) {
+	if (!copy_from_iter_full(buf, len, from)) {
 		kfree(buf);
 		return -EFAULT;
 	}