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

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Date:   Tue, 20 Jul 2021 08:43:43 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     geert+renesas@...der.be
CC:     robh+dt@...nel.org, linux@...linux.org.uk, nico@...xnic.net,
        ardb@...nel.org, linus.walleij@...aro.org, catalin.marinas@....com,
        will@...nel.org, mick@....forth.gr,
        Paul Walmsley <paul.walmsley@...ive.com>,
        aou@...s.berkeley.edu, frowand.list@...il.com, dyoung@...hat.com,
        rppt@...nel.org, bhe@...hat.com, vgoyal@...hat.com,
        akpm@...ux-foundation.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, kexec@...ts.infradead.org,
        linux-mm@...ck.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, geert+renesas@...der.be
Subject:     Re: [PATCH v4 06/10] riscv: Remove non-standard linux,elfcorehdr handling

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.