Re: [PATCH v2] mm/migrate_device: Cleanup up PMD Checks and warnings

[Zi Yan]

On 19 Apr 2026, at 13:47, Sunny Patel wrote:

> Remove the odd VM_WARN_ON_FOLIO(!folio, folio) usage and replace it
> with a simpler VM_WARN_ON_ONCE(!folio) check.
>
> Drop the redundant VM_WARN_ON_ONCE(!pmd_none(*pmdp) &&
> !is_huge_zero_pmd(*pmdp)).
>
> Refactor the PMD checks, making the control flow
> clearer and avoiding duplicate condition checks.
>
> Signed-off-by: Sunny Patel <nueralspacetech@xxxxxxxxx>
> ---
>
> Changes in v2:
>   - Removed additional check for pmd_present() as is_huge_zero_pmd()
>   already checks for pmd_present().
>
> Missed it in first version of this patch.
>
>  mm/migrate_device.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
>
LGTM.

Acked-by: Zi Yan <ziy@xxxxxxxxxx>

--
Best Regards,
Yan, Zi