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

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__split_huge_pud_locked() updates the file/shmem RSS counter after
dropping the PUD 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/20260526101355.1984244-1-yintirui@huawei.com
Fixes: dbe5415329 ("mm/huge_memory: add vmf_insert_folio_pud()")
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: Alistair Popple <apopple@nvidia.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: Zi Yan <ziy@nvidia.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Yin Tirui 2026-05-26 18:13:55 +08:00 committed by Andrew Morton
parent c7bde43f6d
commit 40990c87a2
1 changed files with 1 additions and 1 deletions
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2
mm/huge_memory.c
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@ -3015,9 +3015,9 @@ static void __split_huge_pud_locked(struct vm_area_struct *vma, pud_t *pud,
if (!folio_test_referenced(folio) && pud_young(old_pud))
folio_set_referenced(folio);
folio_remove_rmap_pud(folio, page, vma);
folio_put(folio);
add_mm_counter(vma->vm_mm, mm_counter_file(folio),
-HPAGE_PUD_NR);
folio_put(folio);
}
void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,