linux-kernel - Re: Drop support for x86-32

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Message-ID: <5037AAB0.6040102@genband.com>
Date:	Fri, 24 Aug 2012 10:24:16 -0600
From:	Chris Friesen <chris.friesen@...band.com>
To:	Martin Nybo Andersen <tweek@...ek.dk>
CC:	wbrana <wbrana@...il.com>,
	Bernd Petrovitsch <bernd@...rovitsch.priv.at>,
	Ondrej Zary <linux@...nbow-software.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Drop support for x86-32

On 08/24/2012 10:14 AM, Martin Nybo Andersen wrote:
> (And I'm still not sure why one would run 32-bit applications on a 64-bit
> architecture...)

There are several architectures (powerpc comes to mind) where 32-bit 
userspace on 64-bit kernel is the norm because it offers performance 
advantages due to the smaller pointer size if the process doesn' t need 
the larger address space.  This is the rationale behind the new x32 ABI 
for x86-64 kernels.

You might also want to run legacy apps (which can't be recompiled) on 
new hardware.

Chris

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