linux-kernel - [PATCH 31/75] mm: Add lru_to

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Message-Id: <20220204195852.1751729-32-willy@infradead.org>
Date:   Fri,  4 Feb 2022 19:58:08 +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
Subject: [PATCH 31/75] mm: Add lru_to_folio()

Since page->lru occupies the same bytes as compound_head, any page
on the LRU list must be a folio.

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

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3ca6dea4fe4a..6cb2651eccbe 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -229,6 +229,7 @@ int overcommit_policy_handler(struct ctl_table *, int, void *, size_t *,
 #define PAGE_ALIGNED(addr)	IS_ALIGNED((unsigned long)(addr), PAGE_SIZE)
 
 #define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
+#define lru_to_folio(head) (list_entry((head)->prev, struct folio, lru))
 
 void setup_initial_init_mm(void *start_code, void *end_code,
 			   void *end_data, void *brk);
-- 
2.34.1