Re: [PATCH v4 0/4] hugetlb: Disable huge pmd unshare for uffd-wp

[Peter Xu]

On Thu, Feb 18, 2021 at 06:06:29PM -0500, Peter Xu wrote:
> v4:
> - fix build for sparc by removing extra line in patch 1 [Mike]
> - pick Mike's r-b for patch 4
> 
> v3:
> - patch 4:
>   - fix build failure for !CMA and/or !HUGETLBFS [Axel]
>   - Fix mmu notifier range to use start/end [Mike]
> - add more r-bs
> 
> v2:
> - patch 4: move hugetlb_unshare_all_pmds() into mm/hugetlb.c, so it can be used
>   even outside userfaultfd.c
> 
> This series tries to disable huge pmd unshare of hugetlbfs backed memory for
> uffd-wp.  Although uffd-wp of hugetlbfs is still during rfc stage, the idea of
> this series may be needed for multiple tasks (Axel's uffd minor fault series,
> and Mike's soft dirty series), so I picked it out from the larger series.
> 
> References works:
> 
> Uffd shmem+hugetlbfs rfc:
> https://lore.kernel.org/lkml/20210115170907.24498-1-peterx@xxxxxxxxxx/
> 
> Uffd minor mode for hugetlbfs:
> https://lore.kernel.org/lkml/20210212215403.3457686-1-axelrasmussen@xxxxxxxxxx/
> 
> Soft dirty for hugetlbfs:
> https://lore.kernel.org/lkml/20210211000322.159437-1-mike.kravetz@xxxxxxxxxx/

Andrew/Mike,

Do you have any further comment on this series?

Thanks,

-- 
Peter Xu