On Monday 29 February 2016 12:41:49 Mathieu Desnoyers wrote: > ----- On Feb 29, 2016, at 5:39 AM, Arnd Bergmann arnd@xxxxxxxx wrote: > > What's making things worse is that on some architectures, adding > > __packed will force access by bytes rather than just reading > > a 32-bit or 64-bit numbers directly, so it's slow and non-atomic. > > Agreed that many architectures issue slower instructions when reading > from packed structures, which is unwanted. > > Could we require that each field be naturally aligned and require that > they are placed so _no_ padding whatsoever should ever be added by the > compiler ? If that's possible, then we could remove the packed. Yes, I think that is a reasonable requirement. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
