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

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Message-ID: <20200109004654.GA28530@linaro.org>
Date:   Thu, 9 Jan 2020 09:46:55 +0900
From:   AKASHI Takahiro <takahiro.akashi@...aro.org>
To:     Will Deacon <will@...nel.org>
Cc:     pasha.tatashin@...een.com, 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 Wed, Jan 08, 2020 at 05:48:39PM +0000, Will Deacon wrote:
> 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]

I don't know why we need to change a type of dtb_mem,
otherwise it looks good.

(I also assume that you notice that kimage_arch is of no use for kexec.)

Thank you for the merge,
-Takahiro Akashi


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