Re: [PATCH v3 2/2] secretmem: optimize page_is_secretmem()

[Matthew Wilcox]

On Tue, Apr 20, 2021 at 06:00:49PM +0300, Mike Rapoport wrote:
> +	mapping = (struct address_space *)
> +		((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS);
> +
> +	if (mapping != page->mapping)
> +		return false;
> +
> +	return page->mapping->a_ops == &secretmem_aops;

... why do you go back to page->mapping here?

	return mapping->a_ops == &secretmem_aops