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Date:   Mon, 28 Mar 2022 20:07:13 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Julia Lawall <Julia.Lawall@...ia.fr>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Anders Roxell <anders.roxell@...aro.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Athira Jajeev <atrajeev@...ux.vnet.ibm.com>,
        bigunclemax@...il.com, cgel.zte@...il.com, chenjingwen6@...wei.com,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Corentin Labbe <clabbe@...libre.com>, danielhb413@...il.com,
        Helge Deller <deller@....de>, farosas@...ux.ibm.com,
        ganeshgr@...ux.ibm.com, Geoff Levand <geoff@...radead.org>,
        guozhengkui@...o.com, haren@...ux.ibm.com, hbathini@...ux.ibm.com,
        hbh25y@...il.com, Jakob Koschel <jakobkoschel@...il.com>,
        jniethe5@...il.com, Joe Lawrence <joe.lawrence@...hat.com>,
        Kees Cook <keescook@...omium.org>, kernel.noureddine@...il.com,
        kjain@...ux.ibm.com, ldufour@...ux.ibm.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        maddy@...ux.ibm.com, mamatha4@...ux.vnet.ibm.com,
        Miroslav Benes <mbenes@...e.cz>, mikey@...ling.org,
        Michal Suchanek <msuchanek@...e.de>, nathanl@...ux.ibm.com,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Nick Piggin <npiggin@...il.com>, oss@...error.net,
        Paul Menzel <pmenzel@...gen.mpg.de>,
        Petr Mladek <pmladek@...e.com>, psampat@...ux.ibm.com,
        Randy Dunlap <rdunlap@...radead.org>,
        Ritesh Harjani <riteshh@...ux.ibm.com>, rmclure@...ux.ibm.com,
        sachinp@...ux.ibm.com, sourabhjain@...ux.ibm.com,
        tobias@...dekranz.com, Thierry Reding <treding@...dia.com>,
        Bhaskar Chowdhury <unixbhaskar@...il.com>,
        Vaibhav Jain <vaibhav@...ux.ibm.com>, wangborong@...rlc.com,
        Wedson Almeida Filho <wedsonaf@...gle.com>,
        YueHaibing <yuehaibing@...wei.com>
Subject: Re: [GIT PULL] Please pull powerpc/linux.git powerpc-5.18-1 tag

Linus Torvalds <torvalds@...ux-foundation.org> writes:
> On Fri, Mar 25, 2022 at 3:25 AM Michael Ellerman <mpe@...erman.id.au> wrote:
>>
>> Livepatch support for 32-bit is probably the standout new feature, otherwise mostly just
>> lots of bits and pieces all over the board.
>
> Heh. I would have expected 32-bit ppc to be entirely legacy by now, so
> it's a bit surprising to see that being a standout feature.

We still get the odd bug report from people running mainline, or recent
stable kernels, on 32-bit.

And obviously Christophe has been doing lots of work on the Linux side,
so in that sense 32-bit is alive and well.

Having said that I don't think we'll see any new 32-bit CPU designs, so
the clock is slowly ticking.

> That said:
>
>> There's a series of commits cleaning up function descriptor handling,
>
> For some reason I also thought that powerpc had actually moved away
> from function descriptors, so I'm clearly not keeping up with the
> times.

No you're right, we have moved away from them, but not entirely.

Functions descriptors are still used for 64-bit big endian, but they're
not used for 64-bit little endian, or 32-bit.

cheers

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