linux-kernel - RE: [PATCH v2 0/2] Simplify mtty driver and mdev core

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Date:   Wed, 14 Aug 2019 05:30:57 +0000
From:   Parav Pandit <parav@...lanox.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christoph Hellwig <hch@...radead.org>
CC:     Kirti Wankhede <kwankhede@...dia.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "cohuck@...hat.com" <cohuck@...hat.com>,
        "cjia@...dia.com" <cjia@...dia.com>
Subject: RE: [PATCH v2 0/2] Simplify mtty driver and mdev core

Hi Christoph, Greg,

> -----Original Message-----
> From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Sent: Tuesday, August 13, 2019 11:10 PM
> To: Christoph Hellwig <hch@...radead.org>; Parav Pandit
> <parav@...lanox.com>
> Cc: Kirti Wankhede <kwankhede@...dia.com>; Alex Williamson
> <alex.williamson@...hat.com>; kvm@...r.kernel.org; linux-
> kernel@...r.kernel.org; cohuck@...hat.com; cjia@...dia.com
> Subject: Re: [PATCH v2 0/2] Simplify mtty driver and mdev core
> 
> On Tue, Aug 13, 2019 at 09:37:21AM -0700, Christoph Hellwig wrote:
> > On Tue, Aug 13, 2019 at 02:40:02PM +0000, Parav Pandit wrote:
> > > We need to ask Greg or Linus on the kernel policy on whether an API should
> exist without in-kernel driver.
> 
> I "love" it when people try to ask a question of me and they don't actually cc:
> me.  That means they really do not want the answer (or they already know it...)
> Thanks Christoph for adding me here.
> 
I pretty much knew your answer and I was just hinting Kirti that if you ask Greg you would get the same answer.
So we better cleanup without reaching out to you. :-)

> The policy is that the api should not exist at all, everyone knows this, why is this
> even a question?
> 
Yes, I am aware of this. Few subsystems in which I worked, it has followed this policy cautiously.
But when I heard different policy for mdev, I asked others wisdom.

> > > We don't add such API in netdev, rdma and possibly other subsystem.
> > > Where can we find this mdev driver in-tree?
> >
> > The clear policy is that we don't keep such symbols around.  Been
> > there done that only recently again.
> 
> Agreed.  If anyone knows of anything else that isn't being used, we will be glad
> to free up the space by cleaning it up.
> 
Ok. so this small patchset makes sense.
Thanks for the ack and direction Christoph, Greg.