[PATCH v3 2/2] secretmem: optimize page_is_secretmem()
Matthew Wilcox
willy at infradead.org
Fri May 7 08:01:44 PDT 2021
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
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