On Wed, Jan 11, 2017 at 10:21:06AM +0100, Borislav Petkov wrote: > On Mon, Jan 09, 2017 at 09:51:29PM -0800, Paul E. McKenney wrote: > > Definitely. > > Btw, we have more breakage from RCU expedited using workqueues: > https://bugzilla.kernel.org/show_bug.cgi?id=192111 > > I've added you to CC but let me have other bug reporters confirm reverting > > 8b355e3bc140 ("rcu: Drive expedited grace periods from workqueue") > > does fix the issue for them too. Yes, you could make RCU expedited grace periods go back to using the requesting task, and that would allow expedited grace periods to run early in the boot process. But that causes problems with signals and the like unless you revert a few other patches. The bugzilla is interesting -- it looks like ACPI was in some cases doing early-boot grace-period waits some time back? I have a limping prototype RCU patch that should avoid this problem. If all goes well, I will send it out late tomorrow evening, Pacific Time. Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
