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

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Date:   Tue, 13 Aug 2019 09:37:21 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Parav Pandit <parav@...lanox.com>
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>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v2 0/2] Simplify mtty driver and mdev core

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.
> 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.

The other interesting thing is the amount of code nvidia and partner 
developers have pushed into the kernel tree for exclusive use of their
driver it should be clearly established by now that it is a derived
work, but that is for a different discussion.