Re: [PATCH 4.9 000/102] 4.9.93-stable review

[Thierry Escande]

Hi Greg,

On 07/04/2018 08:11, Greg Kroah-Hartman wrote:
> On Fri, Apr 06, 2018 at 05:25:24PM -0500, Dan Rue wrote:
> > On Fri, Apr 06, 2018 at 03:22:41PM +0200, Greg Kroah-Hartman wrote:
> > > This is the start of the stable review cycle for the 4.9.93 release.
> > > There are 102 patches in this series, all will be posted as a response
> > > to this one.  If anyone has any issues with these being applied, please
> > > let me know.
> > >
> > > Responses should be made by Sun Apr  8 08:42:55 UTC 2018.
> > > Anything received after that time might be too late.
> >
> > Results from Linaroâs test farm.
> > No regressions on arm64, arm and x86_64.
> >
> > There is a new test failure on dragonboard 410c (arm64) in
> > kselftest/cpu-on-off-test. However, it looks like the test was failing
> > but giving a false "PASS" on previous versions of 4.9. This -RC seems to
> > have changed the behavior enough to cause the test to actually mark a
> > failure.
> >
> > In any event, this looks like a db410c-specific pre-existing issue that we have
> > already escalated to our Qualcomm team. Details can be found at
> > https://bugs.linaro.org/show_bug.cgi?id=3723 for those interested.
>
> Thanks for testing these and letting me know.

The test failure on dragonboard 410c comes from [1] to fix a possible 
deadlock related to the hotplug rework. It's been reverted in v4.12 by 
[2] because the cpu hotplug rework was not ready yet at that time. Since 
the hotplug rework has not been backported to v4.9.y, the splat cannot 
be reproduced and so [1] can be reverted or [2] applied on v4.9.y.

[1] https://lkml.org/lkml/2018/3/23/452
[2] https://lkml.org/lkml/2017/5/7/124

Regards,
Thierry