On Wed, Apr 15, 2020 at 10:28:23AM -0700, Ralph Campbell wrote:
>
> On 4/15/20 7:41 AM, Jason Gunthorpe wrote:
> > On Fri, Mar 20, 2020 at 05:31:05PM -0700, Ralph Campbell wrote:
> > > This series adds basic self tests for HMM and are intended for Jason
> > > Gunthorpe's rdma tree which has a number of HMM patches applied.
> >
> > Here are some hunks I noticed while testing this:
> >
> > --- a/lib/Kconfig.debug
> > +++ b/lib/Kconfig.debug
> > @@ -2201,7 +2201,8 @@ config TEST_MEMINIT
> > config TEST_HMM
> > tristate "Test HMM (Heterogeneous Memory Management)"
> > - depends on DEVICE_PRIVATE
> > + depends on TRANSPARENT_HUGEPAGE
> > + select DEVICE_PRIVATE
> > select HMM_MIRROR
> > select MMU_NOTIFIER
> > help
> >
> > It fails testing if TRANSPARENT_HUGEPAGE is not on
> >
> > @@ -1097,6 +1071,7 @@ static int dmirror_device_init(struct dmirror_device *mdevice, int id)
> > spin_lock_init(&mdevice->lock);
> > cdev_init(&mdevice->cdevice, &dmirror_fops);
> > + mdevice->cdevice.owner = THIS_MODULE;
> > ret = cdev_add(&mdevice->cdevice, dev, 1);
> > if (ret)
> > return ret;
> >
> > The use of cdev without a struct device is super weird, but it still
> > needs this
> >
> > diff --git a/tools/testing/selftests/vm/test_hmm.sh b/tools/testing/selftests/vm/test_hmm.sh
> > index 461e4a99a362cf..0647b525a62564 100755
> > --- a/tools/testing/selftests/vm/test_hmm.sh
> > +++ b/tools/testing/selftests/vm/test_hmm.sh
> > @@ -59,7 +59,7 @@ run_smoke()
> > echo "Running smoke test. Note, this test provides basic coverage."
> > load_driver
> > - ./hmm-tests
> > + $(dirname "${BASH_SOURCE[0]}")/hmm-tests
> > unload_driver
> > }
> >
> > Make it runnably reliably
> >
> > Jason
>
> Thanks for the fixes. I'll apply these and send a v9.
> I will also add missing calls to release_mem_region() to free the reserved device private
> addresses.
If you decide to ignore my request to avoid addition of special header
file to UAPI, at least don't copy and install that file without some
special CONFIG option (TEST_HMM ???) requested by the users. It also
will be good to get Acked-by on this change from HMM people.
However, I still think that include/uapi/linux/test_hmm.h opens
pandora box of having UAPI files without real promise to keep it
backward compatible.
Thanks
>
