linux-kernel - Re: Bug report: kernel paniced when system hibernates

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Date:   Fri, 26 May 2023 15:14:33 +0200
From:   Alexandre Ghiti <alexghiti@...osinc.com>
To:     Conor Dooley <conor@...nel.org>,
        Björn Töpel <bjorn@...osinc.com>
Cc:     Atish Patra <atishp@...shpatra.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Anup Patel <anup@...infault.org>,
        Anup Patel <apatel@...tanamicro.com>,
        Alexandre Ghiti <alex@...ti.fr>, robh@...nel.org,
        jeeheng.sia@...rfivetech.com, linux-kernel@...r.kernel.org,
        palmer@...osinc.com, leyfoon.tan@...rfivetech.com,
        mason.huo@...rfivetech.com, Guo Ren <guoren@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Song Shuai <suagrfillet@...il.com>,
        linux-riscv@...ts.infradead.org,
        Andrew Jones <ajones@...tanamicro.com>
Subject: Re: Bug report: kernel paniced when system hibernates

Hi everyone,

On Thu, May 25, 2023 at 11:24 PM Conor Dooley <conor@...nel.org> wrote:
>
> On Thu, May 25, 2023 at 01:06:04PM -0700, Atish Patra wrote:
> > On Thu, May 25, 2023 at 11:39 AM Conor Dooley <conor@...nel.org> wrote:
> > >
> > > On Thu, May 25, 2023 at 11:37:40AM -0700, Atish Patra wrote:
> > >
> > > > Any testing of hibernation still needs to revert the patch until we
> > > > have the proper fix.
> > >
> > > "the patch" is what exactly? I assume you don't mean depending on
> > > NONPORTABLE, since that is a Kconfig option.
> >
> > Nope. Sorry I meant the commit
> >
> > 3335068 ("riscv: Use PUD/P4D/PGD pages for the linear mapping")
>
> Ah, if your SBI implementation is one of the affected ones, yeah.
> If not, you can just set NONPORTABLE :)

@Björn Töpel emitted the idea of excluding from the hibernation all
the memory nodes in the "/reserved-memory" node
(https://elixir.bootlin.com/linux/v6.4-rc1/source/Documentation/devicetree/bindings/reserved-memory/reserved-memory.yaml):
I have to admit that I don't see why it is not done by default by the
kernel.

Unless there is stuff in this node that needs to be "hibernated", I
think that would be a very good solution since we would not rely on
the name of the "internal" nodes of "/reserved-memory" (i.e.
"mmode_resv").

I'm digging into why it is not done by default, just wanted to have
your feedback before the week-end :)