On 02/26/2014 09:19 PM, Andy Lutomirski wrote: >> >> The normal ABI almost certainly makes more sense; as such -mregparm=3 is >> probably not what we want, and I suspect it makes more sense to just >> drop that from the CFLAGS line? > > Hmm. What happens on a native 32-bit build? IIRC the whole kernel is > build with regparm(3). >
Well, the vdso is still built separately, so we can use different CFLAGS if we want to. > If we want to save a cycle or two, then regparm(3) is probably faster. > But I think that these functions should either be asmlinkage or (on > 32 bit builds) explicitly regparm(3) to avoid confusion. I suggest using the standard ABI, but I suggest doing it via CFLAGS. It isn't any faster if the C library has to provide a wrapper just to marshal parameters. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/