What is the proper way to close file received by file_open_root?

Hi, I see in elixir <https://elixir.bootlin.com/linux/v4.19.1/ident/file_open_root> that there 4 calls in the kernel. In two of them fput is used for cleanup, and in coredump.c filp_close is used. The function has no documentation and no information resides in the kernel's Documentation directory. What is the correct way to cleanup the file? Thanks, Tamir