[PATCH v2 11/13] mm: Remove folio_test_transhuge()

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

This function is misleading; people think it means "Is this a THP",
when all it actually does is check whether this is a large folio.
Remove it; the one remaining user should have been checking to see
whether the folio is PMD sized or not.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 include/linux/page-flags.h | 5 -----
 mm/memcontrol.c            | 2 +-
 2 files changed, 1 insertion(+), 6 deletions(-)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 5b466e619f71..e3ca17e95bbf 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -853,11 +853,6 @@ static inline int PageTransHuge(struct page *page)
 	return PageHead(page);
 }
 
-static inline bool folio_test_transhuge(struct folio *folio)
-{
-	return folio_test_head(folio);
-}
-
 /*
  * PageTransCompound returns true for both transparent huge pages
  * and hugetlbfs pages, so it should only be called when it's known
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 35d7e66ab032..67bda1ceedbe 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5765,7 +5765,7 @@ static int mem_cgroup_move_account(struct page *page,
 		if (folio_mapped(folio)) {
 			__mod_lruvec_state(from_vec, NR_ANON_MAPPED, -nr_pages);
 			__mod_lruvec_state(to_vec, NR_ANON_MAPPED, nr_pages);
-			if (folio_test_transhuge(folio)) {
+			if (folio_test_pmd_mappable(folio)) {
 				__mod_lruvec_state(from_vec, NR_ANON_THPS,
 						   -nr_pages);
 				__mod_lruvec_state(to_vec, NR_ANON_THPS,
-- 
2.40.1