linux-kernel - Re: x86 refuses to build [Re: 2.6.24-rc8-mm1]

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Date:	Fri, 18 Jan 2008 00:14:06 +0530
From:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>, tglx@...utronix.de
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: x86 refuses to build [Re: 2.6.24-rc8-mm1]

On Thu, Jan 17, 2008 at 10:58:57PM +0530, Dhaval Giani wrote:
> On Thu, Jan 17, 2008 at 02:35:14AM -0800, Andrew Morton wrote:
> > 
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.24-rc8/2.6.24-rc8-mm1/
> > 
> 
> Hi Ingo, Thomas,
> 
> x86 fails to build with 
> 
> arch/x86/mm/discontig_32.c:39:23: bios_ebda.h:
> No such file or directory
> make[1]: *** [arch/x86/mm/discontig_32.o] Error 1
> make: *** [arch/x86/mm] Error 2
> 
> Applying a trivial fix like,
> 
> ---
>  arch/x86/mm/discontig_32.c |    2 +-
>  1 files changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-2.6.24-rc8/arch/x86/mm/discontig_32.c
> ===================================================================
> --- linux-2.6.24-rc8.orig/arch/x86/mm/discontig_32.c
> +++ linux-2.6.24-rc8/arch/x86/mm/discontig_32.c
> @@ -36,7 +36,7 @@
>  #include <asm/e820.h>
>  #include <asm/setup.h>
>  #include <asm/mmzone.h>
> -#include <bios_ebda.h>
> +#include <asm/bios_ebda.h>
>  
>  struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
>  EXPORT_SYMBOL(node_data);
> 
> 
> causes,
> 
> kernel/built-in.o(.text+0x5131): In function `move_task_off_dead_cpu':
> include/asm/topology.h:43: undefined reference to
> `x86_cpu_to_node_map_early_ptr'
> kernel/built-in.o(.text+0x5156):include/asm/topology.h:48: undefined
> reference to `per_cpu__x86_cpu_to_node_map'
> kernel/built-in.o(.text+0x5c0d): In function `cpu_to_allnodes_group':
> include/asm/topology.h:43: undefined reference to
> `x86_cpu_to_node_map_early_ptr'
> kernel/built-in.o(.text+0x5c2e):include/asm/topology.h:48: undefined
> reference to `per_cpu__x86_cpu_to_node_map'
> kernel/built-in.o(.text+0x5e84): In function `build_sched_domains':
> include/asm/topology.h:43: undefined reference to
> `x86_cpu_to_node_map_early_ptr'

<snip>

grepping around and looking through the code, I notice it is because
these variables just do not exist for 32 bit NUMA. I am not sure how to
go about it, and will just leave it to folks who know what they are
doing there :).

-- 
regards,
Dhaval
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