On Mon, Jul 06, 2020 at 01:17:15PM -0700, Kees Cook wrote:

In preparation for users of the "install a received file" logic outside
of net/ (pidfd and seccomp), relocate and rename __scm_install_fd() from
net/core/scm.c to __receive_fd() in fs/file.c, and provide a wrapper
named receive_fd_user(), as future patches will change the interface
to __receive_fd().

Why the __ prefix if there is no receive_fd()?