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    Subject[PATCH 22/46] mm: rmap: provide pte_order in page_vma_mapped_walk
    From
    page_vma_mapped_walk callers will need this information to know how
    HugeTLB pages are mapped. pte_order only applies if pte is not NULL.

    Signed-off-by: James Houghton <jthoughton@google.com>
    ---
    include/linux/rmap.h | 1 +
    mm/page_vma_mapped.c | 3 +++
    2 files changed, 4 insertions(+)

    diff --git a/include/linux/rmap.h b/include/linux/rmap.h
    index bd3504d11b15..e0557ede2951 100644
    --- a/include/linux/rmap.h
    +++ b/include/linux/rmap.h
    @@ -378,6 +378,7 @@ struct page_vma_mapped_walk {
    pmd_t *pmd;
    pte_t *pte;
    spinlock_t *ptl;
    + unsigned int pte_order;
    unsigned int flags;
    };

    diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c
    index 4e448cfbc6ef..08295b122ad6 100644
    --- a/mm/page_vma_mapped.c
    +++ b/mm/page_vma_mapped.c
    @@ -16,6 +16,7 @@ static inline bool not_found(struct page_vma_mapped_walk *pvmw)
    static bool map_pte(struct page_vma_mapped_walk *pvmw)
    {
    pvmw->pte = pte_offset_map(pvmw->pmd, pvmw->address);
    + pvmw->pte_order = 0;
    if (!(pvmw->flags & PVMW_SYNC)) {
    if (pvmw->flags & PVMW_MIGRATION) {
    if (!is_swap_pte(*pvmw->pte))
    @@ -177,6 +178,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
    if (!pvmw->pte)
    return false;

    + pvmw->pte_order = huge_page_order(hstate);
    pvmw->ptl = huge_pte_lock(hstate, mm, pvmw->pte);
    if (!check_pte(pvmw))
    return not_found(pvmw);
    @@ -272,6 +274,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
    }
    pte_unmap(pvmw->pte);
    pvmw->pte = NULL;
    + pvmw->pte_order = 0;
    goto restart;
    }
    pvmw->pte++;
    --
    2.39.0.314.g84b9a713c41-goog
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