linux-kernel - Re: [PATCH v4 2/2] arm64: kexec

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Date:   Wed, 8 Jan 2020 17:48:39 +0000
From:   Will Deacon <will@...nel.org>
To:     AKASHI Takahiro <takahiro.akashi@...aro.org>,
        pasha.tatashin@...een.com
Cc:     catalin.marinas@....com, will.deacon@....com, robh+dt@...nel.org,
        frowand.list@...il.com, bhsharma@...hat.com,
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
        james.morse@....com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 2/2] arm64: kexec_file: add crash dump support

On Mon, Dec 16, 2019 at 11:12:47AM +0900, AKASHI Takahiro wrote:
> Enabling crash dump (kdump) includes
> * prepare contents of ELF header of a core dump file, /proc/vmcore,
>   using crash_prepare_elf64_headers(), and
> * add two device tree properties, "linux,usable-memory-range" and
>   "linux,elfcorehdr", which represent respectively a memory range
>   to be used by crash dump kernel and the header's location
> 
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Reviewed-by: James Morse <james.morse@....com>
> Tested-and-reviewed-by: Bhupesh Sharma <bhsharma@...hat.com>
> ---
>  arch/arm64/include/asm/kexec.h         |   4 +
>  arch/arm64/kernel/kexec_image.c        |   4 -
>  arch/arm64/kernel/machine_kexec_file.c | 106 ++++++++++++++++++++++++-
>  3 files changed, 106 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h
> index 12a561a54128..d24b527e8c00 100644
> --- a/arch/arm64/include/asm/kexec.h
> +++ b/arch/arm64/include/asm/kexec.h
> @@ -96,6 +96,10 @@ static inline void crash_post_resume(void) {}
>  struct kimage_arch {
>  	void *dtb;
>  	unsigned long dtb_mem;
> +	/* Core ELF header buffer */
> +	void *elf_headers;
> +	unsigned long elf_headers_mem;
> +	unsigned long elf_headers_sz;
>  };

This conflicts with the cleanup work from Pavel. Please can you check my
resolution? [1]

Will

[1] https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/diff/?h=for-kernelci&id=aef73191765a88cadc0a627cdc070e5a0086b015