On Wed, 2006-07-19 at 17:11 -0700, keith mannthey wrote:
> Hello Andrew,
>   This patch converts the i386 summit subarch apicid_to_node to use node
> information provided by the SRAT.  It was discussed a little on LKML a
> few weeks ago and was seen as an acceptable fix.  The current way of
> obtaining the nodeid 
> 
>  static inline int apicid_to_node(int logical_apicid)
>  { 
>    return logical_apicid >> 5;
>  }
> 
> is just not correct for all summit systems/bios.  Assuming the apicid
> matches the Linux node number require a leap of faith that the bios
> mapped out the apicids a set way.  Modern summit HW (IBM x460) does not
> layout its bios in the manner for various reasons and is unable to boot
> i386 numa.
> 
>   The best way to get the correct apicid to node information is from the
> SRAT table during boot.  It lays out what apicid belongs to what node.
> I use this information to create a table for use at run time. 
> 
>   The attached patch was built against 2.6.18-rc1.  It only changes the
> summit subarch.  
> 

Attached updated patch to deal with non-numa Summit config options.   A
build error was reported when booting with numa off and Summit / Genarch
selected.  

Signed-off-by:  Keith Mannthey <kmannth@us.ibm.com>