[PATCH V2 1/2] mm: Update generic gup implementation to handle hugepage directory

[David Miller]

From: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Date: Fri, 24 Oct 2014 10:40:35 +1100

> Another option would be to make the generic code use something defined
> by the arch to decide whether to use speculative get or
> not. I like the idea of keeping the bulk of that code generic...

Me too.  We could have inlines that do either speculative or
non-speculative gets on the pages in some header file and hide
the ifdefs in there.