From 89815ec1031273755865c5573840b86a3dd1b03c Mon Sep 17 00:00:00 2001
From: Zichun Zheng <zhengzichun@oppo.com>
Date: Wed, 27 Sep 2023 14:08:55 +0800
Subject: [PATCH] ANDROID: GKI: export symbols to do reverse mapping within
 memcg and modify lru stats

Export the symbols below to modify LRU state:
  root_mem_cgroup
  __mod_lruvec_state
  mem_cgroup_update_lru_size
  folio_referenced

Bug: 302230539
Change-Id: I27ac888f0fa09981ef4497bc04e4254318af7077
Signed-off-by: Zichun Zheng <zhengzichun@oppo.com>
---
 mm/memcontrol.c | 3 +++
 mm/rmap.c       | 1 +
 2 files changed, 4 insertions(+)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 5879b5d6b483..cb9289925915 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -78,6 +78,7 @@ struct cgroup_subsys memory_cgrp_subsys __read_mostly;
 EXPORT_SYMBOL(memory_cgrp_subsys);
 
 struct mem_cgroup *root_mem_cgroup __read_mostly;
+EXPORT_SYMBOL_GPL(root_mem_cgroup);
 
 /* Active memory cgroup to use from an interrupt context */
 DEFINE_PER_CPU(struct mem_cgroup *, int_active_memcg);
@@ -827,6 +828,7 @@ void __mod_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
 	if (!mem_cgroup_disabled())
 		__mod_memcg_lruvec_state(lruvec, idx, val);
 }
+EXPORT_SYMBOL_GPL(__mod_lruvec_state);
 
 void __mod_lruvec_page_state(struct page *page, enum node_stat_item idx,
 			     int val)
@@ -1392,6 +1394,7 @@ void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
 	if (nr_pages > 0)
 		*lru_size += nr_pages;
 }
+EXPORT_SYMBOL_GPL(mem_cgroup_update_lru_size);
 
 /**
  * mem_cgroup_margin - calculate chargeable space of a memory cgroup
diff --git a/mm/rmap.c b/mm/rmap.c
index d1603eb79818..707de1aa3ceb 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -936,6 +936,7 @@ int folio_referenced(struct folio *folio, int is_locked,
 
 	return rwc.contended ? -1 : pra.referenced;
 }
+EXPORT_SYMBOL_GPL(folio_referenced);
 
 static int page_vma_mkclean_one(struct page_vma_mapped_walk *pvmw)
 {