Re: [PATCH 05/12] mm: hugetlb_vmemmap: unify writable vmemmap page preparation

[Qi Zheng]

On 10/20/26 7:58 PM, Muchun Song wrote:
> Installing a writable vmemmap page requires consuming a replacement page,
> copying the current contents into it and making the copy visible before
> publishing the new mapping.  HVO currently splits this sequence between
> the page-table walker and its caller depending on the remap path.
>
> Centralize the sequence in the walker so all writable replacements follow
> the same copy-and-publish protocol.  This keeps page preparation with the

This makes the copy-and-publish protocol much more solid and easier to
reason about. Nice cleanup!

> mapping update and removes path-specific handling from higher-level HVO
> code.
>
> No functional change intended.
>
> Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
> ---
>   mm/hugetlb_vmemmap.c | 40 +++++++++++++++++-----------------------
>   1 file changed, 17 insertions(+), 23 deletions(-)

Reviewed-by: Qi Zheng <qi.zheng@xxxxxxxxx>

Thanks,
Qi