[PATCH v2 2/2] arm64: hugetlb: enable __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE

[Muchun Song]

> On Aug 1, 2023, at 10:31, Kefeng Wang <wangkefeng.wang at huawei.com> wrote:
> 
> It is better to use huge page size instead of PAGE_SIZE
> for stride when flush hugepage, which reduces the loop
> in __flush_tlb_range().
> 
> Let's support arch's flush_hugetlb_tlb_range(), which is
> used in hugetlb_unshare_all_pmds(), move_hugetlb_page_tables()
> and hugetlb_change_protection() for now.
> 
> Note, for hugepages based on contiguous bit, it has to be
> invalidated individually since the contiguous PTE bit is
> just a hint, the hardware may or may not take it into account.
> 
> Signed-off-by: Kefeng Wang <wangkefeng.wang at huawei.com>

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