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Date: Thu, 05 Mar 2015 14:38:01 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Brian Gerst <brgerst@gmail.com>, Ingo Molnar <mingo@kernel.org>
CC: the arch/x86 maintainers <x86@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Borislav Petkov <bp@alien8.de>,
        Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 0/5] x86: IA32 emulation cleanups
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On 03/03/2015 10:22 PM, Brian Gerst wrote:
> 
> It looks like most cases can simply be replaced.  There are some
> subtle relations with the x32 ABI though, and that will take some time
> to sort out.
> 

Yes, some aspects of CONFIG_COMPAT is used also by x32.

Overall the current Linux kernel handles the case of *more* than two
ABIs extremely poorly.  It is not the only case of more than two ABIs,
either; consider ARM for example.

	-hpa