Want to know something about mlock or shmctl via SHMLOCK

Hi all:

If I mlock a chunk of memory in a user process and pass the address
of
that chunk of memory through ioctl to my kernel module. Then in my
kernel
module, can I just directly access that chunk of the memory from the
user
space address without using
copy_user_to/copy_user_from/get_user_pages/kmap/kmap_atomic?

Is that possible?

.

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