kmap() transformation: Question about copy_user_highpage

[Deepak R Varma]

Hello,
I am attempting to work on replacing the kmap[_atomic]() calls by
kmap_local_page() function call. A detail on this change can be found here [0].

I would like to know if this function: 
	arch/loongarch/mm/init.c::copy_user_highpage()
is currently in use or is it a dead code?

If this code is not in use, can this be removed instead? However, if it is in
use, can you comment why kmap_atomic() was preferred over kmap()
function call?

[0] https://lore.kernel.org/all/20201029222652.302358281@xxxxxxxxxxxxx/

Thank you,
Deepak.