linux-kernel - Re: [PATCH v5 0/9] Add generic support for kdump DT properties

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Date:   Mon, 23 Aug 2021 12:13:29 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Russell King <linux@...linux.org.uk>,
        Nicolas Pitre <nico@...xnic.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Nick Kossifidis <mick@....forth.gr>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Frank Rowand <frowand.list@...il.com>,
        Dave Young <dyoung@...hat.com>, Baoquan He <bhe@...hat.com>,
        Vivek Goyal <vgoyal@...hat.com>,
        Mike Rapoport <rppt@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        kexec@...ts.infradead.org,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 0/9] Add generic support for kdump DT properties

Hi Rob,

On Sun, Aug 15, 2021 at 5:25 PM Rob Herring <robh@...nel.org> wrote:
> On Wed, Aug 11, 2021 at 10:50:58AM +0200, Geert Uytterhoeven wrote:
> > This patch series adds generic support for parsing DT properties related
> > to crash dump kernels ("linux,elfcorehdr" and "linux,elfcorehdr" under
> > the "/chosen" node), makes use of it on arm32, and performs a few
> > cleanups.  It is an evolution of the combination of [1] and [2].
>
> The DT bits look fine to me. How do you expect this to be merged? I'm
> happy to take it if arch maintainers can ack it.

I had hoped you could take the series...

> > The series consists of 6 parts:
> >   1. Patch 1 prepares architecture-specific code (needed for MIPS only)
> >      to avoid duplicating elf core header reservation later.
> >   2. Patch 2 prepares the visibility of variables used to hold
> >      information retrieved from the DT properties.
> >   3. Patches 3-5 add support to the FDT core for handling the
> >      properties.
> >      This can co-exist safely with architecture-specific handling, until
> >      the latter has been removed.
>
> Looks like patch 5 doesn't have any dependencies with the series?

Indeed. So you can take it independently.

> >   4. Patch 6 removes the non-standard handling of "linux,elfcorehdr" on
> >      riscv.
>
> I thought this should be applied for 5.14?

Me too, but unfortunately that hasn't happened yet...

> >   5. Patches 7-8 convert arm64 to use the generic handling instead of
> >      its own implementation.
> >   6. Patch 9 adds support for kdump properties to arm32.
> >      The corresponding patch for kexec-tools is "[PATCH] arm: kdump: Add
> >      DT properties to crash dump kernel's DTB"[3], which is still valid.
>
> This one can be applied on its own, right?

While that wouldn't break anything (i.e. no regression), it still
wouldn't work if the DT properties are present, and the now-legacy
"mem=" kernel command line parameter is not.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds