Re: [PATCH v2 2/2] kasan: fix memory hotplug during boot

[Andrey Ryabinin]

On 05/23/2018 12:07 AM, Andrew Morton wrote:
> On Tue, 22 May 2018 22:50:12 +0300 Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> wrote:
> 
>>
>>
>> On 05/22/2018 07:36 PM, David Hildenbrand wrote:
>>> On 22.05.2018 18:26, Andrey Ryabinin wrote:
>>>>
>>>>
>>>> On 05/22/2018 01:07 PM, David Hildenbrand wrote:
>>>>> Using module_init() is wrong. E.g. ACPI adds and onlines memory before
>>>>> our memory notifier gets registered.
>>>>>
>>>>> This makes sure that ACPI memory detected during boot up will not
>>>>> result in a kernel crash.
>>>>>
>>>>> Easily reproducable with QEMU, just specify a DIMM when starting up.
>>>>
>>>>          reproducible
>>>>>
>>>>> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
>>>>> ---
>>>>
>>>> Fixes: fa69b5989bb0 ("mm/kasan: add support for memory hotplug")
>>>> Acked-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
>>>> Cc: <stable@xxxxxxxxxxxxxxx>
>>>
>>> Think this even dates back to:
>>>
>>> 786a8959912e ("kasan: disable memory hotplug")
>>>
>>
>> Indeed.
> 
> Is a backport to -stable justified for either of these patches?
> 

I don't see any reasons to not backport these.
The first one fixes failure to online memory, why it shouldn't be fixed in -stable?
The second one is fixes boot crash, it's definitely stable material IMO.