Re: [PATCH] kpageflags: detect isolated KPF_THP folios

[David Hildenbrand <david@xxxxxxxxxx>]

> -	} else if (is_zero_pfn(page_to_pfn(page)))
> +	else if (folio_test_large(folio) &&
> +	         folio_test_large_rmappable(folio)) {
> +		/* Note: we indicate any THPs here, not just PMD-sized ones */
> +		u |= 1 << KPF_THP;
> +	} else if (is_huge_zero_folio(folio)) {
>   		u |= 1 << KPF_ZERO_PAGE;
> +		u |= 1 << KPF_THP;
> +	} else if (is_zero_pfn(page_to_pfn(page))) {

We should also directly switch to "is_zero_folio(folio)" here

> +		u |= 1 << KPF_ZERO_PAGE;
> +	}
>   
>   	/*
>   	 * Caveats on high order pages: PG_buddy and PG_slab will only be set

Especially relevant in context of:

https://lkml.kernel.org/r/1720075944-27201-1-git-send-email-yangge1116@xxxxxxx

Acked-by: David Hildenbrand <david@xxxxxxxxxx>

--
Cheers,

David / dhildenb