From d3b0aaa092abb1bf18606aeb0306425aa5e7e446 Mon Sep 17 00:00:00 2001
From: Marcus Ma <maminghui5@xiaomi.corp-partner.google.com>
Date: Mon, 17 Mar 2025 11:28:22 +0800
Subject: [PATCH] ANDROID: Add EXPORT_SYMBOL_GPL for folio_mapcount

We need to get the number of folio mappings through folio_mapcount. Later, pages with mapcount higher than a certain threshold will be skipped for reverse mapping to reduce the high load caused by
reverse mapping during the recycling process.

Bug: 404067677

Change-Id: I21dd847a07fb4e7bb616a3bc01b7d1cdf46e9b0b
Signed-off-by: Marcus Ma <maminghui5@xiaomi.corp-partner.google.com>
---
 mm/util.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/util.c b/mm/util.c
index 36b78dac0706..98771d2bdc67 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -847,6 +847,7 @@ int folio_mapcount(struct folio *folio)
 		ret -= nr;
 	return ret;
 }
+EXPORT_SYMBOL_GPL(folio_mapcount);
 
 /**
  * folio_copy - Copy the contents of one folio to another.