On Sun, Aug 07, 2022 at 08:56:25AM +0200, Greg KH wrote:
> On Sat, Aug 06, 2022 at 09:32:47AM -0700, Paul E. McKenney wrote:
> > On Sat, Aug 06, 2022 at 08:31:26AM +0200, Sedat Dilek wrote:
> > > Hi Al and Paul,
> > >
> > > I pulled latest vfs-next on top of Linux v5.19 and see this in dmesg-logs:
> > >
> > > root# LC_ALL=C dmesg -T | egrep -B5 -A15 'Call Trace:'
> > > [Sat Aug 6 06:51:15 2022] Bluetooth: SCO socket layer initialized
> > > [Sat Aug 6 06:51:15 2022] rcu: INFO: rcu_preempt detected expedited
> > > stalls on CPUs/tasks: { 0-... } 6 jiffies s: 101 root: 0x1/.
> >
> > This is because of the CONFIG_RCU_EXP_CPU_STALL_TIMEOUT=20 in your
> > .config file. This is selected in kernels built with CONFIG_ANDROID=y,
> > and results in an ultra-short 20-millisecond RCU CPU stall timeout for
> > expedited grace periods. Yes, the Android guys want and are getting
> > milliseconds-scale response times from synchronize_rcu_expedited().
> >
> > The last time someone ran into this, the upshot was that CONFIG_ANDROID
> > was to be removed: https://lwn.net/Articles/899743/
> >
> > My guess is that the CONFIG_ANDROID-removal patches are still on their way
> > into mainline (they are in -next), but I added Greg KH and Christoph on CC
> > just in case some other issue arose.
>
> Not that I know of, those changes are all now in Linus's tree.
And now that I do another pull, I do see them, thank you!
So Sedat and Ben can just merge current mainline and be fine.
Thanx, Paul
