linux-kernel - Re: [PATCH 2/3] staging: binder: Support concurrent 32 bit and 64 bit processes.

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Message-ID: <CAMP5XgciqfYJEML8Rhb0w2pk6gboOciK2rczEc4ZdDC_-pgkNQ@mail.gmail.com>
Date:	Fri, 21 Feb 2014 13:56:04 -0800
From:	Arve Hjønnevåg <arve@...roid.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Colin Cross <ccross@...roid.com>,
	Serban Constantinescu <serban.constantinescu@....com>,
	Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH 2/3] staging: binder: Support concurrent 32 bit and 64 bit processes.

On Fri, Feb 21, 2014 at 1:29 PM, John Stultz <john.stultz@...aro.org> wrote:
> On 02/21/2014 12:59 PM, Arve Hjønnevåg wrote:
>> On Fri, Feb 21, 2014 at 12:43 PM, John Stultz <john.stultz@...aro.org> wrote:
>>> From: Arve Hjønnevåg <arve@...roid.com>
>>>
>>> For 64bit systems we want to use the same binder interface for 32bit and
>>> 64bit processes. Thus the size and the layout of the structures passed
>>> between the kernel and the userspace has to be the same for both 32 and
>>> 64bit processes.
>>>
>>> This change replaces all the uses of void* and size_t with
>>> binder_uintptr_t and binder_size_t. These are then typedefed to specific
>>> sizes depending on the use of the interface, as follows:
>>>        * __u32 - on legacy 32bit only userspace
>>>        * __u64 - on mixed 32/64bit userspace where all processes use the same
>>> interface.
>>>
>>> This change also increments the BINDER_CURRENT_PROTOCOL_VERSION to 8 and
>>> hooks the compat_ioctl entry for the mixed 32/64bit Android userspace.
>>>
>> It only increments the version to 8 if the old 32 bit interface is not selected.
>>
>>> This patch also provides a CONFIG_ANDROID_BINDER_IPC_32BIT option for
>>> compatability, which if set which enables the old protocol on 32 bit
>>> systems.
>
> Ok. I thought that point was covered by the detail on
> CONFIG_ANDROID_BINDER_IPC_32BIT, but maybe its not explicit enough.
>
> Would you be ok with:
>
> This change also increments the BINDER_CURRENT_PROTOCOL_VERSION to 8 and
> hooks the compat_ioctl entry for the mixed 32/64bit Android userspace.
>
> This patch also provides a CONFIG_ANDROID_BINDER_IPC_32BIT option for
> compatability, which if set which enables the old protocol, setting
> BINDER_CURRENT_PROTOCOL_VERSION to 7, on 32 bit systems.
>
> ?
>

Yes, but replacing "This change" with "Selecting the 64 bit interface"
would also work.

-- 
Arve Hjønnevåg
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