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

From: Dave Hansen
Date: Fri Dec 12 2014 - 15:27:47 EST

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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