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mm/huge_memory: update file PMD counter before folio_put()

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[ Upstream commit 8d878059924f12c1bc24556a92ec56add74de3c8 ]

__split_huge_pmd_locked() updates the file/shmem RSS counter after
dropping the PMD mapping's folio reference.  If folio_put() drops the last
reference, mm_counter_file() can later read freed folio state via
folio_test_swapbacked().

Move the counter update before folio_put().

Link: https://lore.kernel.org/20260526101337.1984081-1-yintirui@huawei.com
Fixes: fadae29530 ("thp: use mm_file_counter to determine update which rss counter")
Signed-off-by: Yin Tirui <yintirui@huawei.com>
Reviewed-by: Lorenzo Stoakes <ljs@kernel.org>
Acked-by: David Hildenbrand (arm) <david@kernel.org>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Chen Jun <chenjun102@huawei.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Nico Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Yang Shi <yang.shi@linux.alibaba.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ulrich Hecht <uli@kernel.org>
This commit is contained in:
Yin Tirui
2026-06-15 23:17:12 -04:00
committed by Ulrich Hecht
parent 34079adb5b
commit fc6f0355e9
1 changed files with 2 additions and 0 deletions
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2
mm/huge_memory.c
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@ -2149,7 +2149,9 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,
if (!PageReferenced(page) && pmd_young(old_pmd))
SetPageReferenced(page);
page_remove_rmap(page, true);
add_mm_counter(mm, mm_counter_file(page), -HPAGE_PMD_NR);
put_page(page);
return;
}
add_mm_counter(mm, mm_counter_file(page), -HPAGE_PMD_NR);
return;