Why can't you just use copy_*_user() functions and let them take
care of these details, or am I missing something?
But in copy_from_user() function, the kernel do copy the data intto
kernel space besides making some necessory checks.
In fact, the do_page_fault() function will generate "Oops" when
accessing a swapped out user space page. why is that? why don't the
do_page_fault() swapped it back in?
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