linux-kernel - RE: [PATCH 2/2] vfio/mdev: Removed unused and redundant API for mdev name

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Date:   Tue, 6 Aug 2019 13:12:35 +0000
From:   Parav Pandit <parav@...lanox.com>
To:     Cornelia Huck <cohuck@...hat.com>
CC:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "wankhede@...dia.com" <wankhede@...dia.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "cjia@...dia.com" <cjia@...dia.com>
Subject: RE: [PATCH 2/2] vfio/mdev: Removed unused and redundant API for mdev
 name



> -----Original Message-----
> From: Cornelia Huck <cohuck@...hat.com>
> Sent: Tuesday, August 6, 2019 1:59 PM
> To: Parav Pandit <parav@...lanox.com>
> Cc: kvm@...r.kernel.org; wankhede@...dia.com; linux-
> kernel@...r.kernel.org; alex.williamson@...hat.com; cjia@...dia.com
> Subject: Re: [PATCH 2/2] vfio/mdev: Removed unused and redundant API for
> mdev name
> 
> On Fri,  2 Aug 2019 01:59:05 -0500
> Parav Pandit <parav@...lanox.com> wrote:
> 
> > There is no single production driver who is interested in mdev device
> > name.
> > Additionally mdev device name is already available using core kernel
> > API dev_name().
> 
> The patch description is a bit confusing: You talk about removing an api to
> access the device name, but what you are actually removing is the api to access
> the device's uuid. That uuid is, of course, used to generate the device name, but
> the two are not the same. Using
> dev_name() gives you a string containing the uuid, not the uuid.
> 
> >
> > Hence removed unused exported symbol.
> 
> I'm not really against removing this api if no driver has interest in the device's
> uuid (and I'm currently not seeing why they would need it; we can easily add it
> back, should the need arise); but this needs a different description.
> 

Ok. I understand that uuid and dev_name() are not same.
I will update the commit description.
Sending v1.

> >
> > Signed-off-by: Parav Pandit <parav@...lanox.com>
> > ---
> >  drivers/vfio/mdev/mdev_core.c | 6 ------
> >  include/linux/mdev.h          | 1 -
> >  2 files changed, 7 deletions(-)
> >
> > diff --git a/drivers/vfio/mdev/mdev_core.c
> > b/drivers/vfio/mdev/mdev_core.c index b558d4cfd082..c2b809cbe59f
> > 100644
> > --- a/drivers/vfio/mdev/mdev_core.c
> > +++ b/drivers/vfio/mdev/mdev_core.c
> > @@ -57,12 +57,6 @@ struct mdev_device *mdev_from_dev(struct device
> > *dev)  }  EXPORT_SYMBOL(mdev_from_dev);
> >
> > -const guid_t *mdev_uuid(struct mdev_device *mdev) -{
> > -	return &mdev->uuid;
> > -}
> > -EXPORT_SYMBOL(mdev_uuid);
> > -
> >  /* Should be called holding parent_list_lock */  static struct
> > mdev_parent *__find_parent_device(struct device *dev)  { diff --git
> > a/include/linux/mdev.h b/include/linux/mdev.h index
> > 0ce30ca78db0..375a5830c3d8 100644
> > --- a/include/linux/mdev.h
> > +++ b/include/linux/mdev.h
> > @@ -131,7 +131,6 @@ struct mdev_driver {
> >
> >  void *mdev_get_drvdata(struct mdev_device *mdev);  void
> > mdev_set_drvdata(struct mdev_device *mdev, void *data); -const guid_t
> > *mdev_uuid(struct mdev_device *mdev);
> >
> >  extern struct bus_type mdev_bus_type;
> >