Re: [PATCH v3] mm/shmem: fix THP allocation and fallback loop

[Baolin Wang]

On 2025/10/23 14:59, Kairui Song wrote:
> From: Kairui Song <kasong@xxxxxxxxxxx>
>
> The order check and fallback loop is updating the index value on every
> loop, this will cause the index to be wrongly aligned by a larger value
> while the loop shrinks the order.
>
> This may result in inserting and returning a folio of the wrong index
> and cause data corruption with some userspace workloads [1].
>
> Cc: stable@xxxxxxxxxxxxxxx
> Link: https://lore.kernel.org/linux-mm/CAMgjq7DqgAmj25nDUwwu1U2cSGSn8n4-Hqpgottedy0S6YYeUw@xxxxxxxxxxxxxx/ [1]
> Fixes: e7a2ab7b3bb5d ("mm: shmem: add mTHP support for anonymous shmem")
> Signed-off-by: Kairui Song <kasong@xxxxxxxxxxx>
>
> ---

LGTM. Thanks.
Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>