[PATCH] NUMA memory reporting fix

[PATCH] NUMA memory reporting fix

From: Dave Hansen <haveblue@us.ibm.com>

The current numa meminfo code exports (via sysfs) pgdat->node_size, as
totalram.  This variable is consistently used elsewhere to mean "the number
of physical pages that this particular node spans".  This is _not_ what we
want to see from meminfo, which is: "how much actual memory does this node
have?"

The following patch removes pgdat->node_size, and replaces it with
->node_spanned_pages.  This is to avoid confusion with a new variable,
node_present_pages, which is the _actual_ value that we want to export in
meminfo.  Most of the patch is a simple s/node_size/node_spanned_pages/.
The node_size() macro is also removed, and replaced with new ones for
node_{spanned,present}_pages() to avoid confusion.

We were bitten by this problem in this bug:
	http://bugme.osdl.org/show_bug.cgi?id=818

Compiled and tested on NUMA-Q.