[IA64] fix ia64 is_hugepage_only_range

fix is_hugepage_only_range() definition to be "overlaps"
instead of "within architectural restricted hugetlb address
range".  Simplify the ia64 specific code that used to use
is_hugepage_only_range() to just check which region the
address is in.
Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>

arch/ia64/mm/hugetlbpage.c

@@ -112,8 +112,7 @@ void hugetlb_free_pgd_range(struct mmu_gather **tlb,
 			unsigned long floor, unsigned long ceiling)
 {
 	/*
-	 * This is called only when is_hugepage_only_range(addr,),
-	 * and it follows that is_hugepage_only_range(end,) also.
+	 * This is called to free hugetlb page tables.
 	 *
 	 * The offset of these addresses from the base of the hugetlb
 	 * region must be scaled down by HPAGE_SIZE/PAGE_SIZE so that
@@ -125,9 +124,9 @@ void hugetlb_free_pgd_range(struct mmu_gather **tlb,
 
 	addr = htlbpage_to_page(addr);
 	end  = htlbpage_to_page(end);
-	if (is_hugepage_only_range(tlb->mm, floor, HPAGE_SIZE))
+	if (REGION_NUMBER(floor) == RGN_HPAGE)
 		floor = htlbpage_to_page(floor);
-	if (is_hugepage_only_range(tlb->mm, ceiling, HPAGE_SIZE))
+	if (REGION_NUMBER(ceiling) == RGN_HPAGE)
 		ceiling = htlbpage_to_page(ceiling);
 
 	free_pgd_range(tlb, addr, end, floor, ceiling);

include/asm-ia64/page.h

@@ -147,7 +147,7 @@ typedef union ia64_va {
 				 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
 # define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
 # define is_hugepage_only_range(mm, addr, len)		\
-	 (REGION_NUMBER(addr) == RGN_HPAGE &&	\
+	 (REGION_NUMBER(addr) == RGN_HPAGE ||	\
 	  REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE)
 extern unsigned int hpage_shift;
 #endif