Re: Linux kernel updates and v6.0

From: William Kennington <wak@google.com>
To: Joel Stanley <joel@jms.id.au>
Cc: OpenBMC Maillist <openbmc@lists.ozlabs.org>
Subject: Re: Linux kernel updates and v6.0
Date: Wed, 28 Sep 2022 15:30:23 -0700	[thread overview]
Message-ID: <CAPnigK=NZVWH+msS3Ajf-RBQqzK9hnoecizuFF=QbKh-mK=DNw@mail.gmail.com> (raw)
In-Reply-To: <CACPK8XdERea0Mt+3o1z2TwbN_NXJ-FDYf8mxUEAWe5Lp7oFRmg@mail.gmail.com>

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The ToF was talking about linux versions being used for OpenBMC users and
we were wondering if we could codify a policy around which versions we will
be developing against regularly. In the past it seems like you usually pick
LTS releases to base on (and Facebook / Google are interested in sticking
with LTS releases in order to reduce toil / number of potentially
incompatible kernel upgrades for each of our machines). It would seem like
kernel 6.0 should be an LTS release, although gregkh hasn't said anything
specifically about it yet. Can we get something written about the expected
alignment with upstream kernel release cadence?

On Tue, Sep 27, 2022 at 11:35 PM Joel Stanley <joel@jms.id.au> wrote:

> Hello OpenBMC,
>
> We've been using the v5.15 kernel as a base for almost 11 months. In
> that time there's been 16 bumps to pull in stable fixes. We have
> merged about 300 patches in that time to support new machines, and new
> hardware, including MCTP, nct6775, lm25066, aspeed-adc and aspeed's
> spi-nor devices.
>
> It's time to move to a new base to ensure progress is made on our
> mission to upstream all of the support. By rebasing on a new kernel
> release we can see what work has been done, and what remains. Since
> v5.15 we have upstream support for:
>
>  - PECI, thanks to Jae and Iwona
>  - MCTP, thanks to Jermey and Matt
>  - spi-nor, thanks to Cédric
>  - nct6775 i2c and lm25066, thanks to Zev
>  - ast2600 adc, thanks to Billy
>  - ast2600 gfx, thanks to Tommy
>
> and others I have missed.
>
> In addition to the ASPEED changes the Nuvton hackers have been hard at
> work. We now have support for their latest generation  Cortex-A35 BMC,
> the npcm845 "Arbel" and it's eval board. Likewise the HPE "GXP"
> Cortex-A9 ASIC now has upstream support. Congratulations to both teams
> for this work.
>
> I have prepared a v6.0 tree that contains backports of the FSI and
> Aspeed v6.1 patches, and a small set of existing patches. I will
> publish this on Monday, or once v6.0 final has been tagged.
>
> As promised the last time we rebased, the Nuvoton patches that have
> not seen any updates since they were merged in 2019 have been dropped.
> They are welcome to be resubmitted as long as they are also being
> worked on upstream.
>
> Please address any future patches to the dev-6.0 tree.
>
> Cheers,
>
> Joel
>

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