[PATCH/RFC 0/2] Remove pgdat list

[Yasunori Goto <y-goto@jp.fujitsu.com>]

Hello.

I wrote patches to remove pgdat list in pgdat structure, because
I think it is redundant.

In the current implementation, pgdat structure has this list.
struct pglist_data{
        :
   struct pglist_data *pgdat_next;
        :
}
This is used for searching other zones and nodes by for_each_pgdat and
for_each_zone macros. So, if a node is hot added,
the system has to not only set bit of node_online_map,
but also connect this for new node.
However, all of pgdat list user would like to know just
next (online) node. So, I think node_online_map is enough information
for them to find other nodes. 
By this patch, hot add/remove code for node will be a little simpler.

This patches is for 2.6.12-rc3-mhp1. I tested them on Tiger4 with
node emulation.

Please comment.

Thanks.

-- 
Yasunori Goto 

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