linux-kernel - Re: [PATCH v3 0/6] Android Binder IPC Fixes

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Message-ID: <517F985E.7040100@arm.com>
Date:	Tue, 30 Apr 2013 11:09:34 +0100
From:	Serban Constantinescu <Serban.Constantinescu@....com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"kernel-team@...roid.com" <kernel-team@...roid.com>,
	"arve@...roid.com" <arve@...roid.com>,
	"john.stultz@...aro.org" <john.stultz@...aro.org>,
	Dave Butcher <Dave.Butcher@....com>
Subject: Re: [PATCH v3 0/6] Android Binder IPC Fixes

On 30/04/13 11:04, Kirill A. Shutemov wrote:
> On Tue, Apr 30, 2013 at 09:52:34AM +0100, Serban Constantinescu wrote:
>> Hi Kirill,
>>
>> On 30/04/13 08:31, Kirill A. Shutemov wrote:
>>> On Fri, Apr 12, 2013 at 01:25:49PM +0100, Serban Constantinescu wrote:
>>>> The patch set has been successfully tested with a 64bit Linux userspace and
>>>> 64bit binder unit-tests.
>>>>
>>>> This patch set has been successfully tested on 32bit platforms(ARMv7 VExpress)
>>>> and 64bit platforms(ARMv8 RTSM) running a 32bit Android userspace and an in
>>>> kernel binder compat layer.
>>>
>>> I've tried to replace ugly hack with your patches to be able to boot
>>> 32-bit userspace on x86-64. It fails. :(
>>>
>>
>> This patch set fixes the binder interface so that it works on 32/32
>> or 64/64 systems and preps the driver for the compat layer - 64bit
>> kernel/32bit userspace. As discussed with the Android developers the
>> binder compat will live in the userspace.
>
> Does the compat layer already exist or it's a plan?
We were working with a kernel compat layer. However this wasn't 
encouraged by the Android developers who would prefer a userspace binder 
compat.

The changes in this patch set fix the kernel interface so that it will 
work with the yet to be developed userspace wrapper.

Some support for 64/32 systems has already been integrated - see ashmem.

Thanks,
Serban

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