khugepage: replace lru_cache_add() with folio_add_lru()

Replaces some calls with their folio equivalents.  This is in preparation
for the removal of lru_cache_add().  This replaces 3 calls to
compound_head() with 1.

Link: https://lkml.kernel.org/r/20221101175326.13265-5-vishal.moola@gmail.comSigned-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/khugepaged.c

@@ -2013,6 +2013,7 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr,
 
 	if (result == SCAN_SUCCEED) {
 		struct page *page, *tmp;
+		struct folio *folio;
 
 		/*
 		 * Replacing old pages with new one has succeeded, now we
@@ -2040,11 +2041,13 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr,
 			index++;
 		}
 
-		SetPageUptodate(hpage);
-		page_ref_add(hpage, HPAGE_PMD_NR - 1);
+		folio = page_folio(hpage);
+		folio_mark_uptodate(folio);
+		folio_ref_add(folio, HPAGE_PMD_NR - 1);
+
 		if (is_shmem)
-			set_page_dirty(hpage);
-		lru_cache_add(hpage);
+			folio_mark_dirty(folio);
+		folio_add_lru(folio);
 
 		/*
 		 * Remove pte page tables, so we can re-fault the page as huge.