On Thu, May 08, 2014 at 11:06:24AM -0700, Doug Anderson wrote: > I guess I would say that my patch is unhacking the this code. The > code after my patch is simpler. I would perhaps argue that (ec971ea > ARM: add cpufreq transiton notifier to adjust loops_per_jiffy for smp) > should never have landed to begin with.
That depends on your point of view. As I've already pointed out through the examples of why udelay() is inaccurate, for driver authors, they should assume that udelay() just gives you an "approximate" delay and it has no accuracy. When you start from that point, rather than (as you seem to be) believing that it has some kind of accuracy, then the implementation of scaling the loops_per_jiffy is entirely reasonable - it's a best effort implementation. Again, just use a timer for your udelay() implementation. -- FTTC broadband for 0.8mile line: now at 9.7Mbps down 460kbps up... slowly improving, and getting towards what was expected from it. -- 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/