Re: [PATCH v3 3/7] mm: use enum migrate_reason instead of int for migration reason parameters

[Vlastimil Babka (SUSE)]

On 6/30/26 03:53, Ye Liu wrote:
> Replace all 'int reason' function parameters that carry migrate_reason
> values with the proper 'enum migrate_reason' type.  This makes the
> intent explicit and leverages compiler type checking.  The affected
> subsystems are:
> 
>   - page_owner: __folio_set_owner_migrate_reason(),
>                 folio_set_owner_migrate_reason()
>   - migrate: migrate_pages(), migrate_pages_sync(),
>              migrate_pages_batch(), migrate_folios_move(),
>              migrate_hugetlbs(), unmap_and_move_huge_page()
>   - hugetlb: move_hugetlb_state(), htlb_allow_alloc_fallback()
>   - trace: mm_migrate_pages and mm_migrate_pages_start events
> 
> The 'short last_migrate_reason' struct field and internal helper
> parameter in page_owner are intentionally left as 'short' since they
> store per-page metadata where size matters.
> 
> No functional change.
> 
> Signed-off-by: Ye Liu <ye.liu@xxxxxxxxx>

Reviewed-by: Vlastimil Babka (SUSE) <vbabka@xxxxxxxxxx>