linux-kernel - Re: + mm-fix-panic-in-__alloc_pages.patch added to -mm tree

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Message-Id: <20211214125748.974a400f0b05a633f9b971b7@linux-foundation.org>
Date:   Tue, 14 Dec 2021 12:57:48 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Dennis Zhou <dennis@...nel.org>,
        Alexey Makhalov <amakhalov@...are.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "cl@...ux.com" <cl@...ux.com>,
        "mm-commits@...r.kernel.org" <mm-commits@...r.kernel.org>,
        "osalvador@...e.de" <osalvador@...e.de>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "tj@...nel.org" <tj@...nel.org>
Subject: Re: + mm-fix-panic-in-__alloc_pages.patch added to -mm tree

On Tue, 14 Dec 2021 11:11:54 +0100 Michal Hocko <mhocko@...e.com> wrote:

> > I need some clarification here. It sounds like memoryless nodes work on
> > x86, but hotplug + memoryless nodes isn't a supported use case or you're
> > introducing it as a new use case?
> > 
> > If this is a new use case, then I'm inclined to say this patch should
> > NOT go in and a proper fix should be implemented on hotplug's side. I
> > don't want to be in the business of having/seeing this conversation
> > reoccur because we just papered over this issue in percpu.
> 
> The patch still seems to be in the mmotm tree. I have sent a different
> fix candidate [1] which should be more robust and cover also other potential
> places.
> 
> [1] http://lkml.kernel.org/r/20211214100732.26335-1-mhocko@kernel.org

Is cool, I'm paying attention.

We do want something short and simple for backporting to -stable (like
Alexey's patch) so please bear that in mind while preparing an
alternative.