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

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Message-ID: <7d0c6062-ca73-f183-110d-f5b75ae91d10@linux.microsoft.com>
Date:   Tue, 9 Mar 2021 18:31:04 -0800
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     Rob Herring <robh@...nel.org>,
        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>,
        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 3/9/21 6:08 PM, Rob Herring wrote:

Hi Rob,

> 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.

I checked the change applied in linux-next branch and also Device Tree's 
for-next branch - it looks like v1 of Thiago's patch has been applied. 
Could you please pick up the v2 patch?

thanks,
  -lakshmi