On Thu, 2012-09-06 at 15:22 -0700, Paul E. McKenney wrote: > Ah! > > It is perfectly legal to avoid -starting- an RCU grace period for a > minute, or even longer. If RCU has nothing to do, in other words, if no > one registers any RCU callbacks, then RCU need not start a grace period. > > Of course, this would mean that it would eventually be a full minute > since the last start of a grace period. This is not a problem, after > all, Linux went through a full ten years before experiencing its first > grace period. > > But the stall-warning code just checked how long it had been since > the last start of a grace period, failing to note that this grace > period had long since completed. So it splatted out a warning. > This warning was spurious in the sense that there was no bug aside > from the missing check that the grace period was still in progress. > > And this commit fixes that bug in RCU.
OK, that makes sense.. it just looks like both Steve and me got confused by the initial changelog. -- 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/
