linux-kernel - Re: [RFC PATCH 01/20] powerpc/cell: Remove support for IBM Cell Blades

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Message-Id: <9eed5e2a-4ed1-4195-a5b5-511b4d5cd53a@app.fastmail.com>
Date: Thu, 14 Nov 2024 16:28:56 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Michael Ellerman" <mpe@...erman.id.au>, linuxppc-dev@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org, "Jeremy Kerr" <jk@...abs.org>,
 "Geoff Levand" <geoff@...radead.org>
Subject: Re: [RFC PATCH 01/20] powerpc/cell: Remove support for IBM Cell Blades

On Thu, Nov 14, 2024, at 13:50, Michael Ellerman wrote:
> IBM Cell Blades used the Cell processor and the "blade" server form
> factor. They were sold as models QS20, QS21 & QS22 from roughly 2006 to
> 2012 [1]. They were used in a few supercomputers (eg. Roadrunner) that
> have since been dismantled, and were not that widely used otherwise.
>
> Until recently I still had a working QS22, which meant I was able to
> keep the platform support working, but unfortunately that machine has
> now died.
>
> I'm not aware of any users. If there is a user that wants to keep the
> upstream support working, we can look at bringing some of the code back
> as appropriate.
>
> See previous discussion at [2].
>
> Remove the top-level config symbol PPC_IBM_CELL_BLADE, and then
> the dependent symbols PPC_CELL_NATIVE, PPC_CELL_COMMON, CBE_RAS,
> PPC_IBM_CELL_RESETBUTTON, PPC_IBM_CELL_POWERBUTTON, CBE_THERM, and
> AXON_MSI. Then remove the associated C files and headers, and trim
> unused header content (some is shared with PS3).
>
> Note that PPC_CELL_COMMON sounds like it would build code shared with
> PS3, but it does not. It's a relic from when code was shared between the
> Blade support and QPACE support.
>
> Most of the primary authors already have CREDITS entries, with the
> exception of Christian, so add one for him.
>
> [1]: https://www.theregister.com/2011/06/28/ibm_kills_qs22_blade
> [2]: 
> https://lore.kernel.org/linuxppc-dev/60581044-df82-40ad-b94c-56468007a93e@app.fastmail.com
>
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>

Nice clearnup! Whole series

Acked-by: Arnd Bergmann <arnd@...db.de>

Everything here looks good, I had a few comments, but those
are all for follow-up work.

      Arnd