linux-kernel - Re: [PATCH] hv_balloon: avoid touching uninitialized struct page during tail onlining

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Message-ID: <87a7kc2u03.fsf@vitty.brq.redhat.com>
Date:   Mon, 07 Jan 2019 19:38:20 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Sasha Levin <sashal@...nel.org>
Cc:     David Hildenbrand <david@...hat.com>, devel@...uxdriverproject.org,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        linux-kernel@...r.kernel.org, Dexuan Cui <decui@...rosoft.com>
Subject: Re: [PATCH] hv_balloon: avoid touching uninitialized struct page during tail onlining

Sasha Levin <sashal@...nel.org> writes:

> On Mon, Jan 07, 2019 at 02:44:30PM +0100, Vitaly Kuznetsov wrote:
>>P.S. I still think about bringing mem_hotplug_begin()/done() to
>>hv_balloon but that's going to be a separate discussion, here I want to
>>have a small fix backportable to stable.
>
> This should probably be marked for stable then :)
>

Yes, please :-)

I didn't test old kernels but this seems to be an old issue,
e.g. DEFERRED_STRUCT_PAGE_INIT appeared in 4.2 - not sure if memory
hotplug code was using it back then but, oh well, it's all history now.

(I remember Greg disliked when people were tagging patches for stable@
themselves, he prefered maintainers deciding if the particular commit
deserves stable@ or not - but as you have a tree now we may as well have
different rules :-)

-- 
Vitaly