linux-kernel - [PATCH unstable] mm: rmap: abstract updating per-node and per-memcg stats fix

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Date: Tue, 11 Jun 2024 22:10:43 -0700 (PDT)
From: Hugh Dickins <hughd@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
cc: Yosry Ahmed <yosryahmed@...gle.com>, David Hildenbrand <david@...hat.com>, 
    linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH unstable] mm: rmap: abstract updating per-node and per-memcg
 stats fix

/proc/meminfo is showing ridiculously large numbers on some lines:
__folio_remove_rmap()'s __folio_mod_stat() should be subtracting!

Signed-off-by: Hugh Dickins <hughd@...gle.com>
---
A fix for folding into mm-unstable, not needed for 6.10-rc.

 mm/rmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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
-- 
2.35.3