linux-kernel - Re: [PATCH v2 1/2] virtio: stop using legacy struct vring

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Date:   Mon, 6 Apr 2020 11:57:43 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Sudeep Dutt <sudeep.dutt@...el.com>,
        Ashutosh Dixit <ashutosh.dixit@...el.com>,
        Arnd Bergmann <arnd@...db.de>,
        Andy Shevchenko <andy@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        Vadim Pasternak <vadimp@...lanox.com>,
        Jason Wang <jasowang@...hat.com>,
        platform-driver-x86@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 1/2] virtio: stop using legacy struct vring

On Mon, Apr 06, 2020 at 05:56:02PM +0200, Greg Kroah-Hartman wrote:
> On Mon, Apr 06, 2020 at 11:35:23AM -0400, Michael S. Tsirkin wrote:
> > struct vring (in the uapi directory) and supporting APIs are kept
> > around to avoid breaking old userspace builds.
> > It's not actually part of the UAPI - it was kept in the UAPI
> > header by mistake, and using it in kernel isn't necessary
> > and prevents us from making changes safely.
> > In particular, the APIs actually assume the legacy layout.
> > 
> > Add struct vring_s (identical ATM) and supporting
> > legacy APIs and switch everyone to use that.
> 
> How are we going to know that "struct vring_s" is what we need/want to
> use?  What does "_s" mean?
> 
> "struct vring_kernel"?
> 
> naming is hard...
> 
> greg k-h

Hmm. I guess I can just add an ifdef so kernel doesn't see the UAPI
version anymore ...

-- 
MST