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Date:	Wed, 02 Nov 2005 16:45:40 -0800
From:	David Daney <ddaney@avtrex.com>
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To:	sjhill@realitydiluted.com
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	MIPS Linux List <linux-mips@linux-mips.org>
Subject: Re: linux kernel building for mips malta target board
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sjhill@realitydiluted.com wrote:
>>>I would like to build latest kernel (ie kernel 2.6.13) for mips malta
>>>board. Can any one advise me the cross-compiler tools version to be 
>>>used for building the linux kernel.
>>>
>>
>>I use both gcc-3.3.1 and gcc-3.4.3 to build 2.6.x mips linux kernels.  I 
>>think for the 2.6.13 kernel any of the latest released versions of 
>>3.3.x, 3.4.x, or 4.0.x would work.  Use the latest binutils (2.16.91 
>>20050817 is what I am using).
>>
> 
> Also, make sure to NOT use any of the 4.1 GCC stuff with Linux/MIPS
> kernels. I am still tracking down errors with it.
> 

Is this the problem you are seeing?:
In file included from include/linux/nfs_fs.h:15,
                  from init/do_mounts.c:12:
include/linux/pagemap.h: In function ‘fault_in_pages_readable’:
include/linux/pagemap.h:236: error: read-only variable ‘__gu_val’ used 
as ‘asm’ output
include/linux/pagemap.h:236: error: read-only variable ‘__gu_val’ used 
as ‘asm’ output
include/linux/pagemap.h:236: error: read-only variable ‘__gu_val’ used 
as ‘asm’ output
include/linux/pagemap.h:236: error: read-only variable ‘__gu_val’ used 
as ‘asm’ output

The compiler behavior has changed since 4.0.1, but I think the new 
behavior is correct.  I am blaming the __get_user macro in 
include/asm-mips/uaccess.h.  It should be possible to fix it there.  The 
alternative is to hack up include/linux/pagemap.h.

David Daney