linux-kernel - Re: [PATCH] vhost: make msg padding explicit

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Message-ID: <20180502144015.GA18389@la.guarana.org>
Date:   Wed, 2 May 2018 10:40:15 -0400
From:   Kevin Easton <kevin@...rana.org>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
        jasowang@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH] vhost: make msg padding explicit

On Wed, May 02, 2018 at 05:19:27PM +0300, Michael S. Tsirkin wrote:
> On Wed, May 02, 2018 at 10:04:46AM -0400, David Miller wrote:
> > From: "Michael S. Tsirkin" <mst@...hat.com>
> > Date: Wed, 2 May 2018 16:36:37 +0300
> > 
> > > Ouch.  True - and in particular the 32 bit ABI on 64 bit kernels doesn't
> > > work at all. Hmm. It's relatively new and maybe there aren't any 32 bit
> > > users yet. Thoughts?
> > 
> > If it's been in a released kernel version, we really aren't at liberty
> > to play "maybe nobody uses this" UAPI changing games.
> > 
> > Please send me a revert.
> 
> Sent. Looking at compat mess now.

Just naming the padding field isn't sufficient anyway, there also needs to
be code in vhost_new_msg() to initialise it using the name.

    - Kevin