linux-kernel - Re: [RFC][PATCH 0/8] x86, mpx: Support 32-bit binaries on 64-bit kernels

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Date:	Fri, 12 Dec 2014 12:27:42 -0800
From:	Dave Hansen <dave@...1.net>
To:	Andy Lutomirski <luto@...capital.net>, linux-kernel@...r.kernel.org
CC:	tglx@...utronix.de, x86@...nel.org
Subject: Re: [RFC][PATCH 0/8] x86, mpx: Support 32-bit binaries on 64-bit
 kernels

On 12/12/2014 12:22 PM, Andy Lutomirski wrote:
> On 12/12/2014 11:12 AM, Dave Hansen wrote:
>> This is 3.20 material.  I'm hoping to get some comments early
>> in case folks have some issues with the way it's being done.
>>
>> The MPX hardware structures differ in layout in 32 and 64-bit
>> mode.  A 32-bit binary running on a 64-bit kernel needs the
>> 32-bit structures, so we need code which switches between
>> the two modes.
> 
> The OS community figured out years ago that you aren't supposed to do
> this.  Did everyone forget to tell the hardware people?

What is your concern with it, exactly?

You want the same size structures with the same format for 32-bit and
64-bit modes?
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