[PATCH v2 02/25] mm: Optimise find_subpage for !THP

[Matthew Wilcox <willy@xxxxxxxxxxxxx>]

From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>

If THP is disabled, find_subpage can become a no-op.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 include/linux/pagemap.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 75bdfec49710..0842622cca90 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -340,7 +340,7 @@ static inline struct page *find_subpage(struct page *page, pgoff_t offset)
 
 	VM_BUG_ON_PAGE(PageTail(page), page);
 
-	return page + (offset & (compound_nr(page) - 1));
+	return page + (offset & (hpage_nr_pages(page) - 1));
 }
 
 struct page *find_get_entry(struct address_space *mapping, pgoff_t offset);
-- 
2.25.0