linux-kernel - [PATCH v2 8/9] mm: shmem: drop folio reference count using 'nr_pages' in shmem_delete_from_page

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Message-Id: <a11634487d3d3dfb4e69e07f5575de18a27ee67a.1718690645.git.baolin.wang@linux.alibaba.com>
Date: Tue, 18 Jun 2024 14:54:20 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: akpm@...ux-foundation.org,
	hughd@...gle.com
Cc: willy@...radead.org,
	david@...hat.com,
	wangkefeng.wang@...wei.com,
	chrisl@...nel.org,
	ying.huang@...el.com,
	21cnbao@...il.com,
	ryan.roberts@....com,
	shy828301@...il.com,
	ziy@...dia.com,
	ioworker0@...il.com,
	da.gomez@...sung.com,
	p.raghav@...sung.com,
	baolin.wang@...ux.alibaba.com,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 8/9] mm: shmem: drop folio reference count using 'nr_pages' in shmem_delete_from_page_cache()

To support large folio swapin/swapout for shmem in the following patches,
drop the folio's reference count by the number of pages contained in the
folio when a shmem folio is deleted from shmem pagecache after adding
into swap cache.

Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 mm/shmem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index c0a9253f3a99..9a35ee7e7f40 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -831,7 +831,7 @@ static void shmem_delete_from_page_cache(struct folio *folio, void *radswap)
 	__lruvec_stat_mod_folio(folio, NR_FILE_PAGES, -nr);
 	__lruvec_stat_mod_folio(folio, NR_SHMEM, -nr);
 	xa_unlock_irq(&mapping->i_pages);
-	folio_put(folio);
+	folio_put_refs(folio, nr);
 	BUG_ON(error);
 }
 
-- 
2.39.3