kvasprintf
crtc->name = kvasprintf(GFP_KERNEL, name, ap);
str = kvasprintf(flags, format, ap);
encoder->name = kvasprintf(GFP_KERNEL, name, ap);
plane->name = kvasprintf(GFP_KERNEL, name, ap);
char *kvasprintf(int flags, const char *format, va_list ap);
kobj->name = kvasprintf(M_WAITOK, fmt, ap);