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

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Date:	Fri, 21 Feb 2014 12:59:07 -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 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.
>
> Please note that all 64bit kernels will use the 64bit Binder ABI.
>


-- 
Arve Hjønnevåg
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