Re: [External Sender] Re: [PATCH] selftests/mm: add folio_split() and filemap_get_entry() race test

[Adam Bratschi-Kaye]

On 13 Mar 2026, at 7:40, Zi Yan wrote:
> The added folio_split_race_test is a modified C port of the race condition
> test from [1]. The test creates shmem huge pages shared by both a parent
> and a child processes, where the parent process punches holes in the shmem
> to cause folio_split() in the kernel and the child process reads the shmem
> in 16 threads to cause filemap_get_entry() in the kernel.

Note that the fork isn't actually necessary to reproduce the issue. I
had it working as
well with the reading and punching in the same process, but just with
two separate
mappings. Not that it makes much of a difference - just in case you
wanted to simplify
the test.

On 14 Mar 2026, at 18:27, Andrew Morton wrote:
> I couldn't immediately find any licensing info there.  Bas and Adam,
> please advise?

GPL-2.0 license is fine by me.

> And sending your Signed-off-by's would be appropriate.

No problem:

Signed-off-by: Adam Bratschi-Kaye <adam.bratschikaye@xxxxxxxxxxx>

Thanks,
Adam