mm: Add folio_pincount_ptr()

This is the folio equivalent of compound_pincount_ptr().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>

diff --git a/include/linux/mm.h b/include/linux/mm.h
index c64bd0b..c45739d 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1544,6 +1544,11 @@ static inline unsigned long folio_pfn(struct folio *folio)
        return page_to_pfn(&folio->page);
 }
 
+static inline atomic_t *folio_pincount_ptr(struct folio *folio)
+{
+       return &folio_page(folio, 1)->compound_pincount;
+}
+
 /* MIGRATE_CMA and ZONE_MOVABLE do not allow pin pages */
 #ifdef CONFIG_MIGRATION
 static inline bool is_pinnable_page(struct page *page)