linux-kernel - Re: [PATCH] staging/android: change IOCTLs opcode after ABI change

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Message-ID: <CAF6AEGvRniVzadtOrss4NQV40=he1gmkPZGtk8t18__eFYDodg@mail.gmail.com>
Date:	Sat, 12 Mar 2016 12:34:33 -0500
From:	Rob Clark <robdclark@...il.com>
To:	Gustavo Padovan <gustavo@...ovan.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org,
	"dri-devel@...ts.freedesktop.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>,
	Greg Hackmann <ghackmann@...gle.com>,
	John Harrison <John.C.Harrison@...el.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	John Stultz <john.stultz@...aro.org>,
	Rob Herring <robh@...nel.org>
Subject: Re: [PATCH] staging/android: change IOCTLs opcode after ABI change

On Fri, Mar 11, 2016 at 5:00 PM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> On Thu, Mar 03, 2016 at 07:42:43PM -0300, Gustavo Padovan wrote:
>> From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
>>
>> Burn the old opcode to avoid any potential old userspace running the old
>> API to get weird errors. Changing the opcodes will make them fail right
>> away.
>>
>> This is just a precaution, there no upstream users of these interfaces
>> yet and the only user is Android, but we don't expect anyone trying to
>> run android userspace and all it dependencies on top of upstream kernels.
>>
>> Moreover Android should be converted to use upstream sync_files.
>>
>> Suggested-by: Rob Clark <robdclark@...il.com>
>> Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
>> ---
>>  drivers/staging/android/uapi/sync.h | 11 +++++++++--
>>  1 file changed, 9 insertions(+), 2 deletions(-)
>
> Where does this belong in this patch series?  Before it?  After it?  In
> the middle?

Not sure if overkill, but if we wanted to be pedantic about
bisectability put all the uabi struct changes plus ioctl # changes
into a single patch (with the following patches starting to use the
new fields)?

Either way, I think the only two people in the world effected by this
(ie. who are playing with AOSP on an upstream (plus a few patches)
kernel) are Rob Herring and John Stultz.  (Adding them to CC so they
are aware).

BR,
-R

> Please resend the whole series, gather up all of the reviewed and
> signed-off-by markings from everyone involved, and I'll be glad to apply
> them.
>
> thanks,
>
> greg k-h