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

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Date:   Thu, 12 Apr 2018 14:17:50 +0200
From:   Thierry Escande <thierry.escande@...aro.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        akpm@...ux-foundation.org, linux@...ck-us.net,
        shuahkh@....samsung.com, patches@...nelci.org,
        ben.hutchings@...ethink.co.uk, lkft-triage@...ts.linaro.org,
        stable@...r.kernel.org,
        Nicolas Dechesne <nicolas.dechesne@...aro.org>,
        Anibal Limon <anibal.limon@...aro.org>,
        Will Deacon <will.deacon@....com>
Subject: Re: [PATCH 4.9 000/102] 4.9.93-stable review

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 Linaro’s 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