linux-kernel - Re: [PATCH v2 01/11] dma-buf/sync_file: de-stage sync

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Date:	Wed, 27 Jan 2016 15:31:03 +0100
From:	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
To:	Gustavo Padovan <gustavo@...ovan.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	dri-devel@...ts.freedesktop.org,
	Daniel Stone <daniels@...labora.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Riley Andrews <riandrews@...roid.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Rob Clark <robdclark@...il.com>,
	Greg Hackmann <ghackmann@...gle.com>,
	John Harrison <John.C.Harrison@...el.com>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Subject: Re: [PATCH v2 01/11] dma-buf/sync_file: de-stage sync_file

Hey,

Op 27-01-16 om 14:30 schreef Gustavo Padovan:
> From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
>
> sync_file is useful to connect one or more fences to the file. The file is
> used by userspace to track fences.
>
> Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
>
Is there a value in keeping the abi unchanged?
If not, then Documentation/ioctl/botching-up-ioctls.txt is worth a read.

Looking at the patch, it seems you kept SYNC_IOC_WAIT, won't it be better to remove it, and only support waiting with polling?
The code for polling should already work.

It's very unclear what format @driver_data has. I kept it for compatibility with android, but it's not clear to me how a userspace consumer would print it.
Is there a usecase for this, or could it be removed from fence and sync_file?

~Maarten