[PATCH 05/13] mm: Introduce vma_pgtable_walk_{begin|end}()

[Muchun Song]

> On Dec 19, 2023, at 15:55, peterx at redhat.com wrote:
> 
> From: Peter Xu <peterx at redhat.com>
> 
> Introduce per-vma begin()/end() helpers for pgtable walks.  This is a
> preparation work to merge hugetlb pgtable walkers with generic mm.
> 
> The helpers need to be called before and after a pgtable walk, will start
> to be needed if the pgtable walker code supports hugetlb pages.  It's a
> hook point for any type of VMA, but for now only hugetlb uses it to
> stablize the pgtable pages from getting away (due to possible pmd
> unsharing).
> 
> Reviewed-by: Christoph Hellwig <hch at infradead.org>
> Signed-off-by: Peter Xu <peterx at redhat.com>

Reviewed-by: Muchun Song <songmuchun at bytedance.com>

Thanks.