[PATCH v4] mm: make expand_downwards symmetrical to expand_upwards

[Michal Hocko]

Hi Andrew,
I am sorry to repost this kind of trivial cleanup for the 4th time,
but after recent discussion (https://lkml.org/lkml/2011/5/3/323)
with Hugh I think that it makes sense to keep the original
expand_{upwards,downwards} without being explicit about the stack in the
name. As Hugh pointed out, IA64 uses expand_upwards for something that
is not really a stack (it is a backing storage for registers).
The following patch reworks the original one so it is not incremental.
If you prefer incremental one I can send that one instead. 
Just for record this patch obsoletes:
	mm-make-expand_downwards-symmetrical-with-expand_upwards.patch
	mm-make-expand_downwards-symmetrical-with-expand_upwards-v3.patch
in your current (2011-04-29-16-25) mm tree.

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