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    SubjectRe: [PATCH v1 01/10] mm: Expose clear_huge_page() unconditionally
    On Mon, Jun 26, 2023 at 11:14 AM Ryan Roberts <ryan.roberts@arm.com> wrote:
    >
    > In preparation for extending vma_alloc_zeroed_movable_folio() to
    > allocate a arbitrary order folio, expose clear_huge_page()
    > unconditionally, so that it can be used to zero the allocated folio in
    > the generic implementation of vma_alloc_zeroed_movable_folio().
    >
    > Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
    > ---
    > include/linux/mm.h | 3 ++-
    > mm/memory.c | 2 +-
    > 2 files changed, 3 insertions(+), 2 deletions(-)
    >
    > diff --git a/include/linux/mm.h b/include/linux/mm.h
    > index 7f1741bd870a..7e3bf45e6491 100644
    > --- a/include/linux/mm.h
    > +++ b/include/linux/mm.h
    > @@ -3684,10 +3684,11 @@ enum mf_action_page_type {
    > */
    > extern const struct attribute_group memory_failure_attr_group;
    >
    > -#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
    > extern void clear_huge_page(struct page *page,
    > unsigned long addr_hint,
    > unsigned int pages_per_huge_page);
    > +
    > +#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)

    We might not want to depend on THP eventually. Right now, we still
    have to, unless splitting is optional, which seems to contradict
    06/10. (deferred_split_folio() is a nop without THP.)

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