From: Matthew Wilcox (Oracle) <willy@infradead.org>
Date: Mon, 17 Jan 2022 19:40:12 +0000 (-0500)
Subject: mm: Add lru_to_folio()
X-Git-Tag: v6.1-rc5~1777^2~54
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=06d20bdb986815a75fb1addf34655756ba922e3a;p=platform%2Fkernel%2Flinux-starfive.git

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@infradead.org>
---

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 2ca10c1..a583b73 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -225,6 +225,10 @@ 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))
+static inline struct folio *lru_to_folio(struct list_head *head)
+{
+	return list_entry((head)->prev, struct folio, lru);
+}
 
 void setup_initial_init_mm(void *start_code, void *end_code,
 			   void *end_data, void *brk);