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| author | Yin Tirui <yintirui@huawei.com> | 2026-05-26 18:13:55 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-05-31 21:50:25 -0700 |
| commit | 40990c87a26e371594475acdc560c93cfae308a1 (patch) | |
| tree | 5851fe866bc18e533595f67ad226ac3b97ff51b1 /mm | |
| parent | c7bde43f6daf70e05a64fbca7efdf6fa93e057dc (diff) | |
| download | linux-next-40990c87a26e371594475acdc560c93cfae308a1.tar.gz linux-next-40990c87a26e371594475acdc560c93cfae308a1.zip | |
mm/huge_memory: update file PUD counter before folio_put()
__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: dbe54153296d ("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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/huge_memory.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 970e077019b7..1f78b73a0ca4 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -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, |