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

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Message-ID: <5307C553.9040504@linaro.org>
Date:	Fri, 21 Feb 2014 13:29:55 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	Arve Hjønnevåg <arve@...roid.com>
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 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.

?

thanks
-john
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