Re: Why can't we use the user-space pointer in kernel mode?

["cheng long" <kevinclcn@xxxxxxxxx>]

>     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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