linux-kernel - [PATCH v5 14/27] mm/memcg: Add folio wrappers for various functions

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Date:   Sat, 20 Mar 2021 05:40:51 +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, linux-fsdevel@...r.kernel.org,
        linux-cachefs@...hat.com, linux-afs@...ts.infradead.org
Subject: [PATCH v5 14/27] mm/memcg: Add folio wrappers for various functions

Add new wrapper functions folio_memcg(), lock_folio_memcg(),
unlock_folio_memcg() and mem_cgroup_folio_lruvec().

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 include/linux/memcontrol.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 4064c9dda534..493136f495b6 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -397,6 +397,11 @@ static inline struct mem_cgroup *page_memcg(struct page *page)
 	return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
 }
 
+static inline struct mem_cgroup *folio_memcg(struct folio *folio)
+{
+	return page_memcg(&folio->page);
+}
+
 /*
  * page_memcg_rcu - locklessly get the memory cgroup associated with a page
  * @page: a pointer to the page struct
@@ -1400,6 +1405,22 @@ unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
 }
 #endif /* CONFIG_MEMCG */
 
+static inline void lock_folio_memcg(struct folio *folio)
+{
+	lock_page_memcg(&folio->page);
+}
+
+static inline void unlock_folio_memcg(struct folio *folio)
+{
+	unlock_page_memcg(&folio->page);
+}
+
+static inline struct lruvec *mem_cgroup_folio_lruvec(struct folio *folio,
+						    struct pglist_data *pgdat)
+{
+	return mem_cgroup_page_lruvec(&folio->page, pgdat);
+}
+
 static inline void __inc_lruvec_kmem_state(void *p, enum node_stat_item idx)
 {
 	__mod_lruvec_kmem_state(p, idx, 1);
-- 
2.30.2