thp: gup_fast s390/sparc tail refcounting [was Re: [PATCH] thp: tail page refcounting fix #6]

[Andrea Arcangeli]

Hello everyone,

These last three patches are incremental with the ones sent yesterday
(that in turn are incremental with the hugepage mapcount tail
refcounting race fix in -mm).

These should complete the gup_fast arch updates to support the
tail page mapcount refcounting.

sh is the only other one supporting gup_fast and hugetlbfs, but it
looked ok already so it requires no changes (it uses get_page). The
arch requiring updates can easily be found by searching:

	find arch/ -name hugetlbpage.c -or -name gup.c

I'm still uncertain why all these page_cache_get/add_speculative in
various gup.c and the pte change checks are needed there but I didn't
alter those, so if it worked before it'll still work the same.
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