Hi Adam,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on next-20180517]
[cannot apply to linus/master block/for-next v4.17-rc6 v4.17-rc5 v4.17-rc4 v4.17-rc6]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/adam-manzanares-wdc-com/AIO-add-per-command-iopriority/20180522-232203
config: x86_64-randconfig-s0-05230027 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   fs/aio.o: In function `aio_prep_rw':
>> fs/aio.c:1460: undefined reference to `ioprio_check_cap'

vim +1460 fs/aio.c

  1440	
  1441	static int aio_prep_rw(struct kiocb *req, struct iocb *iocb)
  1442	{
  1443		int ret;
  1444	
  1445		req->ki_filp = fget(iocb->aio_fildes);
  1446		if (unlikely(!req->ki_filp))
  1447			return -EBADF;
  1448		req->ki_complete = aio_complete_rw;
  1449		req->ki_pos = iocb->aio_offset;
  1450		req->ki_flags = iocb_flags(req->ki_filp);
  1451		if (iocb->aio_flags & IOCB_FLAG_RESFD)
  1452			req->ki_flags |= IOCB_EVENTFD;
  1453		req->ki_hint = file_write_hint(req->ki_filp);
  1454		if (iocb->aio_flags & IOCB_FLAG_IOPRIO) {
  1455			/*
  1456			 * If the IOCB_FLAG_IOPRIO flag of aio_flags is set, then
  1457			 * aio_reqprio is interpreted as an I/O scheduling
  1458			 * class and priority.
  1459			 */
> 1460			ret = ioprio_check_cap(iocb->aio_reqprio);
  1461			if (ret) {
  1462				pr_debug("aio ioprio check cap error\n");
  1463				return -EINVAL;
  1464			}
  1465	
  1466			req->ki_ioprio = iocb->aio_reqprio;
  1467		} else
  1468			req->ki_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0);
  1469	
  1470		ret = kiocb_set_rw_flags(req, iocb->aio_rw_flags);
  1471		if (unlikely(ret))
  1472			fput(req->ki_filp);
  1473		return ret;
  1474	}
  1475	

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