linux-kernel - [PATCH 13/75] mm: Add folio_pincount

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Date:   Fri,  4 Feb 2022 19:57:50 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-mm@...ck.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        John Hubbard <jhubbard@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        William Kucharski <william.kucharski@...cle.com>
Subject: [PATCH 13/75] mm: Add folio_pincount_ptr()

This is the folio equivalent of compound_pincount_ptr().

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: John Hubbard <jhubbard@...dia.com>
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Reviewed-by: William Kucharski <william.kucharski@...cle.com>
---
 include/linux/mm.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index dd7d6e95e43b..d5f0f2cfd552 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -891,6 +891,11 @@ static inline void destroy_compound_page(struct page *page)
 	compound_page_dtors[page[1].compound_dtor](page);
 }
 
+static inline atomic_t *folio_pincount_ptr(struct folio *folio)
+{
+	return &folio_page(folio, 1)->compound_pincount;
+}
+
 static inline int head_compound_pincount(struct page *head)
 {
 	return atomic_read(compound_pincount_ptr(head));
-- 
2.34.1