linux-kernel - Re: [PATCH v3 02/15] [media] vb2: add explicit fence user API

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Date:   Wed, 04 Oct 2017 17:12:25 -0300
From:   Gustavo Padovan <gustavo.padovan@...labora.com>
To:     Brian Starkey <brian.starkey@....com>,
        Gustavo Padovan <gustavo@...ovan.org>
Cc:     linux-media@...r.kernel.org, Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@....samsung.com>,
        Shuah Khan <shuahkh@....samsung.com>,
        linux-kernel@...r.kernel.org, Jonathan.Chai@....com
Subject: Re: [PATCH v3 02/15] [media] vb2: add explicit fence user API

On Mon, 2017-10-02 at 14:42 +0100, Brian Starkey wrote:
> Hi,
> 
> On Thu, Sep 07, 2017 at 03:42:13PM -0300, Gustavo Padovan wrote:
> > From: Gustavo Padovan <gustavo.padovan@...labora.com>
> > 
> > Turn the reserved2 field into fence_fd that we will use to send
> > an in-fence to the kernel and return an out-fence from the kernel
> > to
> > userspace.
> > 
> > Two new flags were added, V4L2_BUF_FLAG_IN_FENCE, that should be
> > used
> > when sending a fence to the kernel to be waited on, and
> > V4L2_BUF_FLAG_OUT_FENCE, to ask the kernel to give back an out-
> > fence.
> 
> It seems a bit off to me to add this to the uapi, and document it,
> before any of the implementation is present in the kernel.
> 
> Wouldn't it be better to move this patch to be the last one, after
> all
> of the implementation is done?

Yes, that seems a better idea.

Gustavo