# Re: \[PATCH v7 3/3\] kselftest: mm: remove check\_huge\_shmem()

- From: Zi Yan \<ziy@nvidia.com\>
- Date: 2026-09-22 01:31:56 
- List: linux-mm
- Page: https://ratatoskr.run/linux-mm/2026/09/17618805
- Thread: https://ratatoskr.run/linux-mm/2026/09/17614581/t.md

```text
On Mon Sep 21, 2026 at 6:40 AM EDT, Yeoreum Yun wrote:
> check_huge_shmem() was required to distinguish shmem huge pages because
> /proc/self/smaps reports them using a dedicated “ShmemPmdMapped” entry,
> as opposed to “FilePmdMapped” for file-backed huge pages.
>
> Now that /proc/self/smaps is no longer used to detect huge pages and
> /proc/kpageflags is used instead, it is sufficient to distinguish
> between file-backed and anonymous pages since the ShmemPmdMapped is also
> kind of file-backed.
>
> Therefore, remove check_huge_shmem() and use check_huge_file() instead
> and cleanup khugepaged's check_huge operation in mem_ops.
>
> Suggested-by: David Hildenbrand (Arm) <david@kernel.org>
> Signed-off-by: Yeoreum Yun <redacted>
> ---
>  tools/testing/selftests/mm/folio_split_race_test.c |  2 +-
>  tools/testing/selftests/mm/khugepaged.c            | 38 ++++------------------
>  tools/testing/selftests/mm/uffd-common.c           |  4 +--
>  tools/testing/selftests/mm/vm_util.c               |  5 ---
>  tools/testing/selftests/mm/vm_util.h               |  1 -
>  5 files changed, 9 insertions(+), 41 deletions(-)
>
Makes sense.

Acked-by: Zi Yan <ziy@nvidia.com>

-- 
Best Regards,
Yan, Zi


```