Matthew Wilcox (Oracle) [off-list ref] wrote:

+ * Return: The base-2 logarithm of the size of this folio.

You could probably just say "Return: log2 of the size of this folio".

Could we also get a synonym for page_offset()?  Perhaps called folio_fpos()
rather than folio_offset()?  "Offset" is a bit generic.

Reviewed-by: David Howells <dhowells@redhat.com>