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From:   Parav Pandit <parav@mellanox.com>
To:     Cornelia Huck <cohuck@redhat.com>
CC:     "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
        "wankhede@nvidia.com" <wankhede@nvidia.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "alex.williamson@redhat.com" <alex.williamson@redhat.com>,
        "cjia@nvidia.com" <cjia@nvidia.com>
Subject: RE: [PATCH v1 2/2] vfio/mdev: Removed unused and redundant API for
 mdev UUID
Thread-Topic: [PATCH v1 2/2] vfio/mdev: Removed unused and redundant API for
 mdev UUID
Thread-Index: AQHVTGHewj+1neBmdkuk/1V2f0BrWKbvbAyAgAB0EUA=
Date:   Wed, 7 Aug 2019 16:33:11 +0000
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        <20190806141826.52712-1-parav@mellanox.com>
        <20190806141826.52712-3-parav@mellanox.com>
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> -----Original Message-----
> From: Cornelia Huck <cohuck@redhat.com>
> Sent: Wednesday, August 7, 2019 2:58 PM
> To: Parav Pandit <parav@mellanox.com>
> Cc: kvm@vger.kernel.org; wankhede@nvidia.com; linux-
> kernel@vger.kernel.org; alex.williamson@redhat.com; cjia@nvidia.com
> Subject: Re: [PATCH v1 2/2] vfio/mdev: Removed unused and redundant API f=
or
> mdev UUID
>=20
> On Tue,  6 Aug 2019 09:18:26 -0500
> Parav Pandit <parav@mellanox.com> wrote:
>=20
> > There is no single production driver who is interested in mdev device
> > uuid. Currently UUID is mainly used to derive a device name.
> > Additionally mdev device name is already available using core kernel
> > API dev_name().
>=20
> Well, the mdev code actually uses the uuid to check for duplicates before
> registration with the driver core would fail... I'd just drop the two sen=
tences
Yes, it does the check. But its mainly used to derive a device name.
And to ensure that there are no two devices with duplicate name, it compare=
s with the uuid.

Even this 16 bytes storage is redundant.
Subsequently, I will submit a patch to get rid of storing this 16 bytes of =
UUID too.
Because for duplicate name check, device name itself is pretty good enough.

Since I ran out of time and rc-4 is going on, I differed the 3rd simplifica=
tion patch.

Commit message actually came from the thoughts of 3rd patch, but I see that=
 without it, its not so intuitive.

> talking about the device name, IMHO they don't really add useful informat=
ion;
> but I'll leave that decision to the maintainers.
>=20
> >
> > Hence removed unused exported symbol.
> >
> > Signed-off-by: Parav Pandit <parav@mellanox.com>
> > ---
> > Changelog:
> > v0->v1:
> >  - Updated commit log to address comments from Cornelia
> > ---
> >  drivers/vfio/mdev/mdev_core.c | 6 ------
> >  include/linux/mdev.h          | 1 -
> >  2 files changed, 7 deletions(-)
>=20
> Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Thanks for the review.