linux-kernel - Re: [PATCH] Section mismatch contig_page_data and bootmem_node

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Date:	Wed, 20 Aug 2008 23:53:06 +0200
From:	Johannes Weiner <hannes@...urebad.de>
To:	Sean MacLennan <smaclennan@...atech.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Section mismatch contig_page_data and bootmem_node_data

Hi,

Sean MacLennan <smaclennan@...atech.com> writes:

> If CONFIG_NEED_MULTIPLE_NODES is *not* set, then you get a section
> mismatch in reference from the variable contig_page_data to the
> variable __initdata bootmem_node_data.
>
> The simple solution is to just remove the __initdata from
> bootmem_node_data. We could also put an ifdef around the __initdata.
>
> Signed-off-by: Sean MacLennan <smaclennan@...atech.com>
> ---
> diff --git a/mm/bootmem.c b/mm/bootmem.c
> index e023c68..a968ae2 100644
> --- a/mm/bootmem.c
> +++ b/mm/bootmem.c
> @@ -31,7 +31,7 @@ unsigned long max_pfn;
>  unsigned long saved_max_pfn;
>  #endif
>  
> -bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;
> +bootmem_data_t bootmem_node_data[MAX_NUMNODES];

It is totally valid to be init data as it does not get referenced after
bootup and should therefor be freed.

The statically defined pointer from contig_page_data is the problem and
the fix should be on this end rather than worsening code to suppress a
warning.

NAK,

	Hannes
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