linux-kernel - [PATCH v2 13/28] mm: Add folio_pincount

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Message-Id: <20220110042406.499429-14-willy@infradead.org>
Date:   Mon, 10 Jan 2022 04:23:51 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-mm@...ck.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        John Hubbard <jhubbard@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        William Kucharski <william.kucharski@...cle.com>,
        linux-kernel@...r.kernel.org, Jason Gunthorpe <jgg@...pe.ca>
Subject: [PATCH v2 13/28] mm: Add folio_pincount_ptr()

This is the folio equivalent of compound_pincount_ptr().

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 include/linux/mm_types.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 60e4595eaf63..34c7114ea9e9 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -312,6 +312,12 @@ static inline atomic_t *compound_mapcount_ptr(struct page *page)
 	return &page[1].compound_mapcount;
 }
 
+static inline atomic_t *folio_pincount_ptr(struct folio *folio)
+{
+	struct page *tail = &folio->page + 1;
+	return &tail->compound_pincount;
+}
+
 static inline atomic_t *compound_pincount_ptr(struct page *page)
 {
 	return &page[1].compound_pincount;
-- 
2.33.0