Re: [PATCH v2] mm/migrate: fix shmem xarray update during migration

[Zi Yan]

On 4 Mar 2025, at 0:30, Greg KH wrote:

> On Mon, Mar 03, 2025 at 09:03:04PM -0500, Zi Yan wrote:
>> On 28 Feb 2025, at 12:49, Zi Yan wrote:
>>
>>> Pagecache uses multi-index entries for large folio, so does shmem. Only
>>> swap cache still stores multiple entries for a single large folio.
>>> Commit fc346d0a70a1 ("mm: migrate high-order folios in swap cache correctly")
>>> fixed swap cache but got shmem wrong by storing multiple entries for
>>> a large shmem folio. Fix it by storing a single entry for a shmem
>>> folio.
>>>
>>> Fixes: fc346d0a70a1 ("mm: migrate high-order folios in swap cache correctly")
>>> Reported-by: Liu Shixin <liushixin2@xxxxxxxxxx>
>>> Closes: https://lore.kernel.org/all/28546fb4-5210-bf75-16d6-43e1f8646080@xxxxxxxxxx/
>>> Signed-off-by: Zi Yan <ziy@xxxxxxxxxx>
>>> Reviewed-by: Shivank Garg <shivankg@xxxxxxx>
>>
>> +Cc:stable
>>
>
> <formletter>
>
> This is not the correct way to submit patches for inclusion in the
> stable kernel tree.  Please read:
>   https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
> for how to do this properly.
>
> </formletter>

Sure. And this is not the right fix. I will resend a new one. Sorry
for the noise.


Best Regards,
Yan, Zi