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

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Date:	Wed, 04 Nov 2009 23:23:46 +0800
From:	Wu Zhangjin <wuzhangjin@...il.com>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	Arnaud Patard <apatard@...driva.com>, linux-mips@...ux-mips.org,
	LKML <linux-kernel@...r.kernel.org>, huhb@...ote.com,
	yanh@...ote.com, Zhang Le <r0bertz@...too.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nicholas Mc Guire <der.herr@...r.at>, zhangfx@...ote.com,
	liujl@...ote.com
Subject: Re: [PATCH -queue v0 1/6] [loongson] add basic loongson-2f support

Hi,

On Wed, 2009-11-04 at 12:19 +0100, Ralf Baechle wrote:
> 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.
> 

So, we really remove the 32bit support?

1312 config CPU_LOONGSON2
1313         bool
1314         select CPU_SUPPORTS_32BIT_KERNEL  --> remove it?
1315         select CPU_SUPPORTS_64BIT_KERNEL
1316         select CPU_SUPPORTS_HIGHMEM

If you all agree, I will send a new patch to remove the above line and
resend the corresponding patches without 32bit support, and removed the
relative CONFIG_64BIT lines in the patches too.

Regards,
	Wu Zhangjin

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