linux-kernel - Re: [PATCH AUTOSEL 4.14 62/95] mm, memory_hotplug: initialize struct pages for the full memory section

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Date:   Tue, 7 May 2019 09:50:50 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Alexander Duyck <alexander.duyck@...il.com>
Cc:     Sasha Levin <sashal@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Mikhail Zaslonko <zaslonko@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Michal Hocko <mhocko@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Pasha Tatashin <Pavel.Tatashin@...rosoft.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sasha Levin <alexander.levin@...rosoft.com>,
        linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH AUTOSEL 4.14 62/95] mm, memory_hotplug: initialize struct
 pages for the full memory section

On Tue, May 7, 2019 at 9:31 AM Alexander Duyck
<alexander.duyck@...il.com> wrote:
>
> Wasn't this patch reverted in Linus's tree for causing a regression on
> some platforms? If so I'm not sure we should pull this in as a
> candidate for stable should we, or am I missing something?

Good catch. It was reverted in commit 4aa9fc2a435a ("Revert "mm,
memory_hotplug: initialize struct pages for the full memory
section"").

We ended up with efad4e475c31 ("mm, memory_hotplug:
is_mem_section_removable do not pass the end of a zone") instead (and
possibly others - this was just from looking for commit messages that
mentioned that reverted commit).

              Linus