[PATCH 11/22] mm: Use entire_mapcount in __page_dup_rmap()

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Remove the use of the compound_mapcount_ptr() wrapper, and add an
assertion that we're not passing a tail page if we're duplicating a PMD.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 include/linux/rmap.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index aa682a2a93ce..a6bd1f0a183d 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -208,7 +208,14 @@ void hugepage_add_new_anon_rmap(struct page *, struct vm_area_struct *,
 
 static inline void __page_dup_rmap(struct page *page, bool compound)
 {
-	atomic_inc(compound ? compound_mapcount_ptr(page) : &page->_mapcount);
+	if (compound) {
+		struct folio *folio = (struct folio *)page;
+
+		VM_BUG_ON_PAGE(compound && !PageHead(page), page);
+		atomic_inc(&folio->_entire_mapcount);
+	} else {
+		atomic_inc(&page->_mapcount);
+	}
 }
 
 static inline void page_dup_file_rmap(struct page *page, bool compound)
-- 
2.35.1





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