why do we call clear_active_flags in shrink_inactive_list ?

In 2.6.23's shrink_inactive_list function, why do we have to call
clear_active_flags after isolate_lru_pages call ?
IMHO, If it call isolate_lru_pages with "zone->inactive_list", It can
be sure that it is not PG_active. So I think It is unnecessary calling
clear_active_flags. Nonetheless, Why do we have to recheck PG_active
flags wich clear_active_flags.

If it is right, which case it happens that page is set to be PG_active ?

-- 
Thanks,
barrios
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