../../i86xpv/io/psm/xpv_psm.c:297:25: error: cast between incompatible function types from 'void (*)(char *, struct regs *)' to 'uint_t (*)(char *, char *)' {aka 'unsigned int (*)(char *, char *)'} [-Werror=cast-function-type]
  if (!psm_add_nmintr(0, (avfunc) xen_psm_nmi_intr,
                         ^
cc1: all warnings being treated as errors