Re: [PATCH v3 02/12] mm: hugetlb_vmemmap: unify VMEMMAP_{SPLIT,REMAP}_NO_TLB_FLUSH

[Mike Rapoport]

On Wed, 04 Nov 2026 10:35:00 +0800, Muchun Song <songmuchun@xxxxxxxxxxxxx> wrote:
> VMEMMAP_SPLIT_NO_TLB_FLUSH and VMEMMAP_REMAP_NO_TLB_FLUSH do not
> describe fully independent choices. A split-only walk can defer the
> PMD-split flush to a later global flush, and a remap-only walk can
> defer the final remap flush. However, when a PMD split is followed
> by PTE remapping, the split flush must happen before the PTEs are
> changed, because stale large-page translations must not overlap with
> new small-page translations that map different physical pages.
> 
> [...]

Reviewed-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>

-- 
Sincerely yours,
Mike.