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

[Thierry Escande]

On 12/04/2018 14:23, Greg Kroah-Hartman wrote:
> On Thu, Apr 12, 2018 at 02:17:50PM +0200, Thierry Escande wrote:
> > 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
>
> Hm, so I need to drop some patch, but what one?  lkml.org does not work
> for me, please be specific and use the git commit ids, or at the
> very-least, the subject of the patches.  Never make someone have to rely
> on the existance of a random web site not under kernel developer's
> control to figure out what to do...

So the commit to be reverted is [1], introduced in v4.9.90. Or you can 
apply [2] from v4.12 that actually reverts [1].

[1] 18dd7b964c01ac44497471f4ea3f4c0c663eab55
[2] 51d638b1f56a0bfd9219800620994794a1a2b219

Regards,
Thierry