[PATCH] discontigmem fixes and cleanups
From Martin Bligh This patch fixes a nasty bug that wli found in buffer.c which cause an oops - we were using contig_page_data on a discontigmem machine. It's a slightly modified version of the fix wli suggested, tested on NUMA-Q. I've also added code to not define contig_page_data for discontigmem systems, to stop this from happening again. I wrapped a couple of bootmem functions that were using it in #ifndef CONFIG_DISCONTIGMEM. I suppose it's possible (though unlikely) that some other discontig arch might need to wrap a couple of functions in their tree similarly, but any borkage will just give a simple clear compiler error telling them exactly where the problem is.
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