mm/hugetlb.c: simplify PageHeadHuge() and PageHuge()

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Pravin Shelar <pshelar@nicira.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Ben Hutchings <bhutchings@solarflare.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Johannes Weiner <jweiner@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/hugetlb.c

@@ -690,15 +690,11 @@ static void prep_compound_gigantic_page(struct page *page, unsigned long order)
  */
 int PageHuge(struct page *page)
 {
-	compound_page_dtor *dtor;
-
 	if (!PageCompound(page))
 		return 0;
 
 	page = compound_head(page);
-	dtor = get_compound_page_dtor(page);
-
-	return dtor == free_huge_page;
+	return get_compound_page_dtor(page) == free_huge_page;
 }
 EXPORT_SYMBOL_GPL(PageHuge);
 
@@ -708,14 +704,10 @@ EXPORT_SYMBOL_GPL(PageHuge);
  */
 int PageHeadHuge(struct page *page_head)
 {
-	compound_page_dtor *dtor;
-
 	if (!PageHead(page_head))
 		return 0;
 
-	dtor = get_compound_page_dtor(page_head);
-
-	return dtor == free_huge_page;
+	return get_compound_page_dtor(page_head) == free_huge_page;
 }
 EXPORT_SYMBOL_GPL(PageHeadHuge);