On Tue, 27 Feb 2007, Andrew Morton wrote: > > On Mon, 26 Feb 2007 17:35:17 -0800 Stephen Hemminger <[EMAIL PROTECTED]> > > wrote: > > The kernel already has several implmentations and usages of 64 by 64 > > bit divide. > > > > Although it is significantly slower, there are places that need it so > > provide one generic version using scaling, and allow existing platform > > versions to continue. > > The reason we implement 64/32 via do_div() is, for better or for worse, to > make people think before they use it. And to make it stand out, and so > that we discover places that are using it by accident, where they could use > something cheaper.
IMHO it is even more important that the user of your 64/64 div is aware that it only returns an approximate result. I certainly don't want to have any code in the kernel that by accident makes an allocation a few bytes short of the actual size of the object (just to make up a drastic example). Tim - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
