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SubjectRe: [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@linaro.org>
> > Cc: Catalin Marinas <catalin.marinas@arm.com>
> > Cc: Will Deacon <will.deacon@arm.com>
> > Reviewed-by: James Morse <james.morse@arm.com>
> > Tested-and-reviewed-by: Bhupesh Sharma <bhsharma@redhat.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
>

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