Originally from Matt Dobson. I've been running with this for a while
in -dj, with no noticable side-effects.

Matt:

node_zonelists looks like it should really be declared of size
MAX_NR_ZONES, not GFP_ZONEMASK.  GFP_ZONEMASK is currently 15, making
node_zonelists an array of 16 elements.  The extra zonelists are all
just duplicates of the *real* zonelists, namely the first 3 entries.
Again, if anyone can explain to me why I'm wrong in my thinking, I'd
love to know.  There's certainly no way you could bitwise-and something
with any combination of the GFP_DMA and GFP_HIGHMEM flags to refer to
the 12th zonelist or some such!  Or am I crazy?