phys_mapping
int rc = phys_mapping(addr, &mem_offset);
rc = phys_mapping(addr + size - 1, &mem_offset);
extern int phys_mapping(unsigned long phys, unsigned long long *offset_out);
EXPORT_SYMBOL(phys_mapping);
fd = phys_mapping(phys, &offset);
int fd = phys_mapping(phys, &offset);
init_data.stub_code_fd = phys_mapping(uml_to_phys(__syscall_stub_start),
init_data.stub_data_fd = phys_mapping(uml_to_phys(tramp_data->stub_data),