User Space Memory Access

__copy_to_user_inatomic — Copy a block of data into user space, with less checking.
__copy_to_user — Copy a block of data into user space, with less checking.
__copy_from_user — Copy a block of data from user space, with less checking.
clear_user — Zero a block of memory in user space.
__clear_user — Zero a block of memory in user space, with less checking.