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

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Message-ID: <09c36096-f8c8-b9e9-0bed-113e494f159a@virtuozzo.com>
Date:   Tue, 22 May 2018 22:50:12 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     David Hildenbrand <david@...hat.com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        "open list:KASAN" <kasan-dev@...glegroups.com>
Subject: Re: [PATCH v2 2/2] kasan: fix memory hotplug during boot



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@...hat.com>
>>> ---
>>
>> Fixes: fa69b5989bb0 ("mm/kasan: add support for memory hotplug")
>> Acked-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
>> Cc: <stable@...r.kernel.org>
> 
> Think this even dates back to:
> 
> 786a8959912e ("kasan: disable memory hotplug")
> 

Indeed.