Requiring special mappings to give a list of struct pages is
inflexible: it prevents sane use of IO memory in a special mapping,
it's inefficient (it requires arch code to initialize a list of
struct pages, and it requires the mm core to walk the entire list
just to figure out how long it is), and
Requiring special mappings to give a list of struct pages is
inflexible: it prevents sane use of IO memory in a special mapping,
it's inefficient (it requires arch code to initialize a list of
struct pages, and it requires the mm core to walk the entire list
just to figure out how long it is), and
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