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Re: [PATCH -queue v0 1/6] [loongson] add basic loongson-2f support

To: Wu Zhangjin <wuzhangjin@gmail.com>
Subject: Re: [PATCH -queue v0 1/6] [loongson] add basic loongson-2f support
From: Ralf Baechle <ralf@linux-mips.org>
Date: Wed, 4 Nov 2009 12:19:57 +0100
Cc: Arnaud Patard <apatard@mandriva.com>, linux-mips@linux-mips.org, LKML <linux-kernel@vger.kernel.org>, huhb@lemote.com, yanh@lemote.com, Zhang Le <r0bertz@gentoo.org>, Thomas Gleixner <tglx@linutronix.de>, Nicholas Mc Guire <der.herr@hofr.at>, zhangfx@lemote.com, liujl@lemote.com
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On Wed, Nov 04, 2009 at 07:04:12PM +0800, Wu Zhangjin wrote:

> > Small question : Why don't you restrict to 64bit kernels only ? From
> > what I remember from some discussions with ST, trying to use a 32-bit
> > kernel on 2f is a nice way to get troubles. It would be better imho to
> > forbid such a configuration. As a side effect, this will remove all
> > 'defined(CONFIG_64BIT)' parts of your #ifdef tests. 
> > 
> 
> It's hard to make such a decision ;) Perhaps some guys want to play with
> the 32bit version.

We have other systems where 32-bit kernel support is just remarkably ugly.
We've dropped 32-bit support for the SGI IP32 aka O2 - nobody seems to even
have really noticed that.  The Sibyte systems would be good candidates to do
the same as accesses to outside the 32-bit address space are needed very
frequently.

  Ralf

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