Re: [PATCH HACK RFC] cpu: Prevent late-arriving interrupts from disrupting offline

[Dietmar Eggemann]

On 6/11/19 3:54 PM, Paul E. McKenney wrote:
> On Tue, Jun 11, 2019 at 03:14:54PM +0200, Dietmar Eggemann wrote:
> > On 6/8/19 6:41 PM, Paul E. McKenney wrote:
> > > On Tue, Jun 04, 2019 at 03:29:32PM +0200, Dietmar Eggemann wrote:
> > > > On 6/4/19 9:45 AM, Paul E. McKenney wrote:
> > > > > On Mon, Jun 03, 2019 at 03:39:18PM +0200, Dietmar Eggemann wrote:
> > > > > > On 6/3/19 1:44 PM, Mark Rutland wrote:
> > > > > > > On Mon, Jun 03, 2019 at 10:38:48AM +0200, Peter Zijlstra wrote:
> > > > > > > > On Sat, Jun 01, 2019 at 06:12:53PM -0700, Paul E. McKenney wrote:
> > > > > > > > > Scheduling-clock interrupts can arrive late in the CPU-offline process,

[...]

> > Tested your patch on top of v5.2-rc4* on Arm TC2 (32bit) and CPU
> > hotplug stress test. W/o your patch, the test fails within seconds
> > since CPUs are not coming up again. W/ your patch, the test runs for
> > hours just fine.
> >
> > You can add my:
> >
> > Tested-by: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
>
> Thank you!!!
>
> > * just for the record: one additional unrelated patch (to disable
> > the NOR flash) is necessary on Arm TC2:
> > https://patchwork.kernel.org/patch/10968391 .
>
> Is this progressing, or does it also need help getting to mainline?

This is an unrelated specific issue w/ the TC2 platform which will 
progress independently. Other Arm32 platforms should profit from your 
patch independently of that. I just wanted to mention it here in case 
people try to recreate the test on this specific platform.
> Left to myself, I will push my patch and assume that the NOR flash patch
> will make it in its own good time -- or, alternatively, that there is
> someone better positioned than me to push it.

IMHO, the best thing is you push your patch.