[PATCH] hugetlbfs mmap ENOMEM failure

2.6.15's hugepage faulting introduced huge_pages_needed accounting into
hugetlbfs: to count how many pages are already in cache, for spot check
on how far a new mapping may be allowed to extend the file.  But it's
muddled: each hugepage found covers HPAGE_SIZE, not PAGE_SIZE.  Once
pages were already in cache, it would overshoot, wrap its hugepages
count backwards, and so fail a harmless repeat mapping with -ENOMEM.
Fixes the problem found by Don Dupuis.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Acked-By: Adam Litke <agl@us.ibm.com>
Acked-by: William Irwin <wli@us.ibm.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>