linux-kernel - Re: [PATCH v4 06/10] riscv: Remove non-standard linux,elfcorehdr handling

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Date:   Fri, 23 Jul 2021 17:17:08 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        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>,
        Nick Kossifidis <mick@....forth.gr>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Frank Rowand <frowand.list@...il.com>,
        Dave Young <dyoung@...hat.com>,
        Mike Rapoport <rppt@...nel.org>, Baoquan He <bhe@...hat.com>,
        Vivek Goyal <vgoyal@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        kexec@...ts.infradead.org, Linux MM <linux-mm@...ck.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 06/10] riscv: Remove non-standard linux,elfcorehdr handling

Hi Palmer,

On Tue, Jul 20, 2021 at 5:43 PM Palmer Dabbelt <palmer@...belt.com> wrote:
> On Wed, 14 Jul 2021 05:50:16 PDT (-0700), geert+renesas@...der.be wrote:
> > RISC-V uses platform-specific code to locate the elf core header in
> > memory.  However, this does not conform to the standard
> > "linux,elfcorehdr" DT bindings, as it relies on a reserved memory node
> > with the "linux,elfcorehdr" compatible value, instead of on a
> > "linux,elfcorehdr" property under the "/chosen" node.
> >
> > The non-compliant code can just be removed, as the standard behavior is
> > already implemented by platform-agnostic handling in the FDT core code.
> >
> > Fixes: 5640975003d0234d ("RISC-V: Add crash kernel support")
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> > ---
> > v4:
> >   - No changes.
> > ---
> >  arch/riscv/mm/init.c | 20 --------------------
> >  1 file changed, 20 deletions(-)
> >
> > diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> > index 269fc648ef3d84b2..4aa4b6a034086df6 100644
> > --- a/arch/riscv/mm/init.c
> > +++ b/arch/riscv/mm/init.c
> > @@ -829,26 +829,6 @@ static void __init reserve_crashkernel(void)
> >  }
> >  #endif /* CONFIG_KEXEC_CORE */
> >
> > -#ifdef CONFIG_CRASH_DUMP
> > -/*
> > - * We keep track of the ELF core header of the crashed
> > - * kernel with a reserved-memory region with compatible
> > - * string "linux,elfcorehdr". Here we register a callback
> > - * to populate elfcorehdr_addr/size when this region is
> > - * present. Note that this region will be marked as
> > - * reserved once we call early_init_fdt_scan_reserved_mem()
> > - * later on.
> > - */
> > -static int __init elfcore_hdr_setup(struct reserved_mem *rmem)
> > -{
> > -     elfcorehdr_addr = rmem->base;
> > -     elfcorehdr_size = rmem->size;
> > -     return 0;
> > -}
> > -
> > -RESERVEDMEM_OF_DECLARE(elfcorehdr, "linux,elfcorehdr", elfcore_hdr_setup);
> > -#endif
> > -
> >  void __init paging_init(void)
> >  {
> >       setup_bootmem();
>
> Reviewed-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
> Acked-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
>
> LMK if you wanted me to take this series, otherwise I'm going to assume
> it's going in via some other tree.

There will be a v5 of the series in response to the review comments.
But I think this patch can already be applied.

Thanks!

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