Messages in this thread | | | Date | Thu, 13 Jul 2017 05:43:18 -0700 | From | "Paul E. McKenney" <> | Subject | Re: Regression with suspicious RCU usage splats with cpu_pm change |
| |
On Thu, Jul 13, 2017 at 01:50:26PM +0200, Rafael J. Wysocki wrote: > On Thu, Jul 13, 2017 at 11:43 AM, Alex Shi <alex.shi@linaro.org> wrote: > > > > On 07/13/2017 03:07 PM, Tony Lindgren wrote: > >> Hi, > >> > >> Looks like next-20170713 gives me a bunch of "suspicious RCU usage" > >> splats with cpuidle_coupled on duovero, see below. I bisected it down > >> to commit 2f027e003d05 ("cpu_pm: replace raw_notifier with > >> atomic_notifier"). > > OK, so I'm dropping this commit.
You can surround idle-loop RCU-reading code with RCU_NONIDLE(). This will tell RCU to pay attention even though the CPU is otherwise idle.
Thanx, Paul
| |