[PATCH] ARM: exynos_defconfig: disable CONFIG_EXYNOS5420_MCPM; not stable

Kevin Hilman khilman at kernel.org
Mon Nov 24 17:35:25 PST 2014

On Mon, Nov 24, 2014 at 4:25 PM, Olof Johansson <olof at lixom.net> wrote:
> On Mon, Nov 24, 2014 at 11:51 AM, Kevin Hilman <khilman at kernel.org> wrote:
>> Kukjin,
>> On Mon, Nov 10, 2014 at 11:35 AM, Kevin Hilman <khilman at kernel.org> wrote:
>>> Kukjin Kim <kgene at kernel.org> writes:
>>>> Kevin Hilman wrote:
>>>>> From: Kevin Hilman <khilman at linaro.org>
>>>>> The option CONFIG_EXYNOS5420_MCPM is causing imprecise external aborts
>>>>> during boot testing, causing various userspace startup failures.
>>>>> Disable until it has gotten more testing.
>>>>> Cc: Kukjin Kim <kgene.kim at samsung.com>,
>>>>> Cc: Javier Martinez Canillas <javier.martinez at collabora.co.uk>,
>>>>> Cc: Sachin Kamat <sachin.kamat at samsung.com>,
>>>>> Cc: Doug Anderson <dianders at chromium.org>,
>>>>> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie at samsung.com>,
>>>>> Cc: Krzysztof Kozlowski <k.kozlowski at samsung.com>,
>>>>> Cc: Tushar Behera <tushar.behera at linaro.org>,
>>>>> Cc: stable at vger.kernel.org # v3.17+
>>>>> Signed-off-by: Kevin Hilman <khilman at linaro.org>
>>>>> ---
>>>>> This has been reported by a few people[1], but not investigated or fixed, so it's
>>>>> time to disable this feature until it can be fixed.
>>>> Hi Kevin,
>>>> Yeah I agree with your opinion.
>>>> But as you can see my tree, I've queued regarding mcpm patches for 3.19 will
>>>> be shown in -next in this weekend.
>>> Which of the recently queued patches are expected to address the
>>> imprecise abort issue?  I'd be happy to test them out.
>> Exynos5 MCPM is still broken in linux-next and still causing an imprecise abort.
>> What is the status of $SUBJECT patch?
>>>> Anyway let me apply this into -fixes and
>>>> then let's enable after test its functionality in -next in a couple of days.
>>> Yes, I think this needs to be applied until these aborts are understood
>>> and fixed.
>> Is anyone at Samsung actually looking into these MCPM issues?
> Hi Kevin,
> What hardware are you having problems with? 5420 or 5422/5800?

Yes.  :)


My boot tests seem to pass fine because I have such a minimal
userspace, but Tyler Baker reported that with a "real" userspace, he
can't boot to a shell:



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