Re: [PATCH v2 5/5] mm/page_alloc: remove set_page_private() in prep_compound_tail()

[Lance Yang <lance.yang@linux.dev>]

On 2026/7/3 21:47, Zi Yan wrote:
> Tail pages are expected to have (and optionally be checked) zeroed
> ->private when they are freed. It stays true during subsequent
> reallocation, so replace the tail_page->private initialization with a
> VM_WARN_ON_ONCE() in compound page preparation.
> 
> Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
> Signed-off-by: Zi Yan <ziy@nvidia.com>
> ---

LGTM. Feel free to add:

Reviewed-by: Lance Yang <lance.yang@linux.dev>

>   mm/internal.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/internal.h b/mm/internal.h
> index fa4fb69444ecd..fbd9fb84341bc 100644
> --- a/mm/internal.h
> +++ b/mm/internal.h
> @@ -902,7 +902,7 @@ static inline void prep_compound_tail(struct page *tail,
>   {
>   	tail->mapping = TAIL_MAPPING;
>   	set_compound_head(tail, head, order);
> -	set_page_private(tail, 0);
> +	VM_WARN_ON_ONCE(tail->private);
>   }
>   
>   static inline void init_compound_tail(struct page *tail,
>