linux-kernel - Re: [PATCH v2] powerpc/kexec_file: Restore FDT size estimation for kdump kernel

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Date:   Tue, 9 Mar 2021 19:08:05 -0700
From:   Rob Herring <robh@...nel.org>
To:     Thiago Jung Bauermann <bauerman@...ux.ibm.com>
Cc:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        kexec@...ts.infradead.org, Hari Bathini <hbathini@...ux.ibm.com>,
        Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] powerpc/kexec_file: Restore FDT size estimation for
 kdump kernel

On Fri, Feb 19, 2021 at 6:52 PM Thiago Jung Bauermann
<bauerman@...ux.ibm.com> wrote:
>
> Commit 2377c92e37fe ("powerpc/kexec_file: fix FDT size estimation for kdump
> kernel") fixed how elf64_load() estimates the FDT size needed by the
> crashdump kernel.
>
> At the same time, commit 130b2d59cec0 ("powerpc: Use common
> of_kexec_alloc_and_setup_fdt()") changed the same code to use the generic
> function of_kexec_alloc_and_setup_fdt() to calculate the FDT size. That
> change made the code overestimate it a bit by counting twice the space
> required for the kernel command line and /chosen properties.
>
> Therefore change kexec_fdt_totalsize_ppc64() to calculate just the extra
> space needed by the kdump kernel, and change the function name so that it
> better reflects what the function is now doing.
>
> Signed-off-by: Thiago Jung Bauermann <bauerman@...ux.ibm.com>
> Reviewed-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
> ---
>  arch/powerpc/include/asm/kexec.h  |  2 +-
>  arch/powerpc/kexec/elf_64.c       |  2 +-
>  arch/powerpc/kexec/file_load_64.c | 26 ++++++++------------------
>  3 files changed, 10 insertions(+), 20 deletions(-)

I ended up delaying the referenced series til 5.13, but have applied
it now. Can I get an ack from the powerpc maintainers on this one?
I'll fixup the commit log to make sense given the commit id's aren't
valid.

Rob