linux-kernel - Re: page_to_nid not linked in on PAE

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Date:	Wed, 10 Mar 2010 11:30:32 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
cc:	suresh.b.siddha@...el.com, hpa@...or.com
Subject: Re: page_to_nid not linked in on PAE

On Tuesday 2010-03-09 13:32, Jan Engelhardt wrote:
>
>I have here a compile error with 2.6.33 related to some change in
>page flags. The offending commit, according to bisect, is
>
>commit 46cf98cdaef5471926010b5bddf84c44ec177fdd
>
>    x86, pat: Generalize the use of page flag PG_uncached
>    
>$ make ARCH=i386 vmlinux
> ...
>  LD      .tmp_vmlinux1
>arch/x86/built-in.o: In function `dma_generic_alloc_coherent':
>(.text+0x42b2): undefined reference to `page_to_nid'
...

Due to the addition of page flags (like in the commit above),
there are less bits to encode the node.
In other words, reducing CONFIG_NODES_SHIFT works around the problem.
But that can't really be a terminal solution.

>CONFIG_NODES_SHIFT=7
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