Re: [PATCH v8 14/14] mm: thp: always enable mTHP support

[Baolin Wang]

On 9/18/26 9:45 AM, Luiz Capitulino wrote:
> If PMD-sized pages are not supported on an architecture (ie. the
> arch implements arch_has_pmd_leaves() and it returns false) then the
> current code disables all THP, including mTHP.
>
> This commit fixes this by allowing mTHP to be always enabled for all
> archs. When PMD-sized pages are not supported, its sysfs entry won't be
> created and their mapping will be disallowed at page-fault time.
>
> Similarly, this commit implements the following changes for shmem in
> shmem_allowable_huge_orders():
>
>   - Drop the pgtable_has_pmd_leaves() check so that mTHP sizes are
>     considered
>   - Filter out PMD and PUD orders from allowable orders when
>     PMD-sized pages are not supported by the CPU
>
> Signed-off-by: Luiz Capitulino <luizcap@xxxxxxxxxx>
> ---

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