netdev - Re: Linux regressions report for mainline [2022-03-06]

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Date:   Mon, 7 Mar 2022 15:26:31 +0100
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     Rob Herring <robh@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Jakub Kicinski <kuba@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux regressions mailing list <regressions@...ts.linux.dev>,
        Netdev <netdev@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>
Subject: Re: Linux regressions report for mainline [2022-03-06]

On 07.03.22 14:34, Rob Herring wrote:
> On Mon, Mar 7, 2022 at 1:32 AM Thorsten Leemhuis
> <regressions@...mhuis.info> wrote:
>>
>> On 06.03.22 22:33, Linus Torvalds wrote:
>>> On Sun, Mar 6, 2022 at 11:58 AM Regzbot (on behalf of Thorsten
>>> Leemhuis) <regressions@...mhuis.info> wrote:
>>>>
>>>> ========================================================
>>>> current cycle (v5.16.. aka v5.17-rc), culprit identified
>>>> ========================================================
>>>>
>>>> Follow-up error for the commit fixing "PCIe regression on APM Merlin (aarch64 dev platform) preventing NVME initialization"
>>>> ---------------------------------------------------------------------------------------------------------------------------
>>>> https://linux-regtracking.leemhuis.info/regzbot/regression/Yf2wTLjmcRj+AbDv@xps13.dannf/
>>>> https://lore.kernel.org/stable/Yf2wTLjmcRj%2BAbDv@xps13.dannf/
>>>>
>>>> By dann frazier, 29 days ago; 7 activities, latest 23 days ago; poked 13 days ago.
>>>> Introduced in c7a75d07827a (v5.17-rc1)
> Actually, it was introduced over a year ago in 6dce5aa59e0b. It was
> fixed in c7a75d07827a for XGene2, but that *further* broke XGene1
> which was just reported this cycle.

Many thx for the clarification, I'll update the regzbot entry
accordingly and..

>>> Hmm. The culprit may be identified, but it looks like we don't have a
>>> fix for it, so this may be one of those "left for later" things. It
>>> being Xgene, there's a limited number of people who care, I'm afraid.
>>>
>>> Alternatively, maybe 6dce5aa59e0b ("PCI: xgene: Use inbound resources
>>> for setup") should just be reverted as broken?
>>
>> I don't care much, I just hope someone once again will look into this,
>> as this (and the previous) regression are on my list for quite a while
>> already and process once again seems to have slowed down. :-/
> 
> It's going to take some more debug patches from me as what's been
> tried so far didn't work and I'm not ready to give up and revert this
> cleanup.

...will mark it as "on backburner" then, which stands for "get it out of
sight, but don't forget about this completely".

Ciao, Thorsten