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

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Message-ID: <20230525-geologist-cottage-a51fa889a3d0@wendy>
Date:   Thu, 25 May 2023 13:55:37 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Atish Patra <atishp@...shpatra.org>
CC:     Alexandre Ghiti <alexghiti@...osinc.com>,
        Anup Patel <anup@...infault.org>,
        Song Shuai <suagrfillet@...il.com>, <robh@...nel.org>,
        Andrew Jones <ajones@...tanamicro.com>, <palmer@...osinc.com>,
        <jeeheng.sia@...rfivetech.com>, <leyfoon.tan@...rfivetech.com>,
        <mason.huo@...rfivetech.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Guo Ren <guoren@...nel.org>, <linux-riscv@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <regressions@...ts.linux.dev>
Subject: Re: Bug report: kernel paniced when system hibernates

On Wed, May 24, 2023 at 04:53:59PM -0700, Atish Patra wrote:

> We can also just revert the commit
> 3335068 ("riscv: Use PUD/P4D/PGD pages for the linear mapping")
> until a proper solution is available.

I'm actually inclined to go the other day. If hibernation never works
in a released kernel we can't regress it & since we have not settled on
a fix for this yet we don't know whether the fix would then remove
support for hibernation where it used to work.

> IIRC, Alex also suggested the same as there is no measured benefit
> with this patch.
> It is good to have 1GB huge page mappings but it can be delayed until
> we have the fix
> for the hibernation issue.

IIRC it was the 1 GiB hugepages that Alex said were ~worthless.

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