mm: hugetlbfs: use __compound_tail_refcounted in __get_page_tail too

Also remove hugetlb.h which isn't needed anymore as PageHeadHuge is
handled in mm.h.

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/swap.c

@@ -31,7 +31,6 @@
 #include <linux/memcontrol.h>
 #include <linux/gfp.h>
 #include <linux/uio.h>
-#include <linux/hugetlb.h>
 
 #include "internal.h"
 
@@ -261,7 +260,7 @@ bool __get_page_tail(struct page *page)
 	struct page *page_head = compound_trans_head(page);
 
 	/* Ref to put_compound_page() comment. */
-	if (PageSlab(page_head) || PageHeadHuge(page_head)) {
+	if (!__compound_tail_refcounted(page_head)) {
 		smp_rmb();
 		if (likely(PageTail(page))) {
 			/*