On Sat, May 30, 2026 at 08:54:11AM +0000, Dev Jain wrote:
> pagemap_pmd_range_thp() warns if a non-present PMD is not a migration
> entry. This became false once device-private entries at the PMD level were
> added.
>
> Therefore, remove the stale migration-only assertion.
>
> Fixes: a30b48bf1b24 ("mm/migrate_device: implement THP migration of zone
> device pages")
> Cc: [email protected]
> Signed-off-by: Dev Jain <[email protected]>
LGTM so:
Reviewed-by: Lorenzo Stoakes <[email protected]>
I also verified that I could trigger this locally with your test, so feel free
to add:
Tested-by: Lorenzo Stoakes <[email protected]>
Cheers, Lorenzo
> ---
> fs/proc/task_mmu.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 1e3a15bf46f4e..58938e62154d9 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -2129,7 +2129,6 @@ static int pagemap_pmd_range_thp(pmd_t *pmdp, unsigned
> long addr,
> flags |= PM_SOFT_DIRTY;
> if (pmd_swp_uffd_wp(pmd))
> flags |= PM_UFFD_WP;
> - VM_WARN_ON_ONCE(!pmd_is_migration_entry(pmd));
> page = softleaf_to_page(entry);
> }
>
> --
> 2.43.0
>
