loongarch64 syscalls not updated because it seems like that kernel port hasn't
been working for a year or so:

    In file included from arch/loongarch/include/uapi/asm/unistd.h:5:
    include/uapi/asm-generic/unistd.h:2:10: fatal error: 'asm/bitsperlong.h' file not found

That file is just missing from the tree. :shrug: