linux-kernel - 0001-mm-rmap-Correct-stats-calulation-in-__folio_remove

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Message-Id: <7369acecbf91db58e8c539678867170b5eef13e3.f5a34363.12c5.4c20.b839.0ef7c6407444@feishu.cn>
Date: Fri, 14 Jun 2024 15:52:32 +0800
From: 史思远 <shisiyuan@...iang.com>
To: "Andrew Morton" <akpm@...ux-foundation.org>, 
	"linux-mm@...ck.org" <linux-mm@...ck.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: 0001-mm-rmap-Correct-stats-calulation-in-__folio_remove_r

Dear mm maintainers,

This patch fixes wrong stats calulation in __folio_remove_rmap().

diff --git a/mm/rmap.c b/mm/rmap.c
index 52357d79917c..f9aeabd691fa 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1567,7 +1567,7 @@ static __always_inline void __folio_remove_rmap(struct folio *folio,
                    list_empty(&folio->_deferred_list))
                        deferred_split_folio(folio);
        }
-       __folio_mod_stat(folio, nr, nr_pmdmapped);
+       __folio_mod_stat(folio, -nr, -nr_pmdmapped);

        /*
         * It would be tidy to reset folio_test_anon mapping when fully

BRs,
Stephen

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