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Re: Another problem with compiling Linux kernel

To: David Daney <ddaney@avtrex.com>
Subject: Re: Another problem with compiling Linux kernel
From: Ralf Baechle <ralf@linux-mips.org>
Date: Wed, 16 Nov 2005 15:19:56 +0000
Cc: Jonathan Day <imipak@yahoo.com>, linux-mips@linux-mips.org
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On Tue, Nov 15, 2005 at 01:37:21PM -0800, David Daney wrote:

> >what happens". When trying GCC 4.1.0 (snapshot from
> >20051017), I get the following error:
> >
> >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:237: error: read-only variable
> >'__gu_val' used as 'asm' output
> >include/linux/pagemap.h:237: error: read-only variable
> >'__gu_val' used as 'asm' output
> >include/linux/pagemap.h:237: error: read-only variable
> >'__gu_val' used as 'asm' output
> >include/linux/pagemap.h:237: error: read-only variable
> >'__gu_val' used as 'asm' output
> >include/linux/pagemap.h:243: error: read-only variable
> >'__gu_val' used as 'asm' output
> >include/linux/pagemap.h:243: error: read-only variable
> >'__gu_val' used as 'asm' output
> >include/linux/pagemap.h:243: error: read-only variable
> >'__gu_val' used as 'asm' output
> >include/linux/pagemap.h:243: error: read-only variable
> >'__gu_val' used as 'asm' output
> >make[1]: *** [init/do_mounts.o] Error 1
> >make: *** [init] Error 2
> >
> >This one may be a compiler bug (experimental GCCs are,
> >well, experimental!) but it makes it somewhat harder
> >to know if the later issue is resolved by using a
> >different toolchain.
> >
> 
> This is not a GCC bug, but a change in GCC behavior.  One patch was 
> posted here:
> 
> http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=Pine.LNX.4.61.0511022057140.3511%40trantor.stuart.netsweng.com
> 
> I don't know if the change made it into the linux-mips git repository or 
> not.

That patch has a few shortcomings, so I didn't apply it yet.  Unfortunately
a proper solution turns out to be a pretty hard nut.

  Ralf

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