Re: [PATCH v5 07/19] selftests/mm: move is_backed_by_folio() into vm_util

[Baolin Wang]

On 9/8/26 8:50 PM, Kiryl Shutsemau wrote:
> From: "Kiryl Shutsemau (Meta)" <kas@xxxxxxxxxx>
>
> Checking that an address range is backed by a folio of a given order is
> useful to any test that builds or collapses large folios.  mTHP collapse
> coverage in the khugepaged selftest needs exactly that.
>
> split_huge_page_test.c already has the building block:
> is_backed_by_folio() reads the compound head and tail flags from
> /proc/kpageflags to classify the folio behind a page.
>
> Move it into vm_util so other tests can use it.  No functional change.
>
> Assisted-by: LLM
> Acked-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
> Acked-by: Lorenzo Stoakes (ARM) <ljs@xxxxxxxxxx>
> Tested-by: Muhammad Usama Anjum <usama.anjum@xxxxxxx>
> Signed-off-by: Kiryl Shutsemau (Meta) <kas@xxxxxxxxxx>
> ---

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