There is an "early COW" mechanism in __do_fault() which, if the page is
not present and the fault is FAULT_PAGE_WRITE goes ahead and copies the
page in order to prevent the next exception.
The question - why the code in __do_fault() does not decrease the shared
map count of the old page as do_wp_page does ? And while we are at it,
while this "early COW" code is much more simple than do_wp_page()?
Thanks.
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