Re: [PATCH 01/11] mm/mm_init: verify zones for template-initialized pages

[Mike Rapoport <rppt@kernel.org>]

Hi,

On Mon, Nov 09, 2026 at 05:57:56PM +0800, Muchun Song wrote:
> Template-based ZONE_DEVICE initialization bypasses
> __init_single_page(), which means copied struct pages do not run the
> vmemmap zone consistency check.
> 
> Verify each destination after copying the template so the fast path gets
> the same validation as regular page initialization.
> 
> Signed-off-by: Muchun Song <songmuchun@bytedance.com>

Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

I'll wait for the next version before reviewing the rest.

> ---
>  mm/mm_init.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/mm_init.c b/mm/mm_init.c
> index a9d848c92678..0129152b74d8 100644
> --- a/mm/mm_init.c
> +++ b/mm/mm_init.c
> @@ -1082,6 +1082,7 @@ static void zone_device_page_init_from_template(struct page *page,
>  		set_page_address(template, __va(pfn << PAGE_SHIFT));
>  #endif
>  	memcpy_nontemporal(page, template, sizeof(*page));
> +	vmemmap_optimization_verify_zone(page);
>  }
>  
>  /*
> -- 
> 2.54.0
> 

-- 
Sincerely yours,
Mike.