pub unsafe extern "C" fn xc_perfc_query(
xch: *mut xc_interface,
desc: *mut xc_hypercall_buffer_t,
val: *mut xc_hypercall_buffer_t,
) -> c_intpub unsafe extern "C" fn xc_perfc_query(
xch: *mut xc_interface,
desc: *mut xc_hypercall_buffer_t,
val: *mut xc_hypercall_buffer_t,
) -> c_int