Re: [PATCH v4 6/6] mm/mm_init: add zone mismatch warning during page init

[Muchun Song]

> On Oct 10, 2026, at 15:57, Muchun Song <songmuchun@xxxxxxxxxxxxx> wrote:
> 
> For vmemmap-optimized sections, tail struct pages may be backed by
> shared vmemmap pages. Those shared pages must carry the same page zone
> ID as the struct pages initialized for the section.
> 
> Warn in __init_single_page() if the shared tail page has a different
> page_zone_id(), which would indicate inconsistent initialization.

Please ignore Sashiko's report [1], both are false positive. It didn't
realize that shared vmemmap pages are initialized early before __init_single_page().

[1] https://sashiko.dev/#/patchset/20261010075755.83339-1-songmuchun%40bytedance.com?part=6

Thanks.