On Fri, Mar 10, 2023 at 05:12:40PM +0000, Edgecombe, Rick P wrote: > > Can we use distinct negative retvals in each case so that it is clear > > to > > userspace where it fails, *if* it fails? > > Good idea, I think maybe ERANGE. For those two, right? /* If there isn't space for a token */ if (set_tok && size < 8) return -EINVAL; if (addr && addr <= 0xFFFFFFFF) return -EINVAL; They are kinda range-checking of sorts. A wider range but still similar... -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette