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Subject: Re: [PATCH v16 06/16] lib: fdt: add a helper function for handling
 memory range property
To:     Will Deacon <will.deacon@arm.com>,
        "AKASHI, Takahiro" <takahiro.akashi@linaro.org>
Cc:     Rob Herring <robh+dt@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        David Howells <dhowells@redhat.com>,
        Vivek Goyal <vgoyal@redhat.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        David Miller <davem@davemloft.net>, dyoung@redhat.com,
        Baoquan He <bhe@redhat.com>, Arnd Bergmann <arnd@arndb.de>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        prudo@linux.ibm.com, Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        bhsharma@redhat.com, kexec@lists.infradead.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Frank Rowand <frowand.list@gmail.com>,
        devicetree@vger.kernel.org
References: <20181115055254.2812-1-takahiro.akashi@linaro.org>
 <20181115055254.2812-7-takahiro.akashi@linaro.org>
 <CAL_JsqL4_Z5pVfoB3opjL7eTzZvhBJW7_aQS443quAAR0gGH1w@mail.gmail.com>
 <20181206155424.GA4422@arm.com>
From:   James Morse <james.morse@arm.com>
Message-ID: <681e1265-2f0c-2a62-3778-09911b2be7fc@arm.com>
Date:   Fri, 7 Dec 2018 10:12:47 +0000
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Hi Akashi, Will,

On 06/12/2018 15:54, Will Deacon wrote:
> On Thu, Dec 06, 2018 at 08:47:04AM -0600, Rob Herring wrote:
>> On Wed, Nov 14, 2018 at 11:52 PM AKASHI Takahiro
>> <takahiro.akashi@linaro.org> wrote:
>>>
>>> Added function, fdt_setprop_reg(), will be used later to handle
>>> kexec-specific property in arm64's kexec_file implementation.
>>> It will possibly be merged into libfdt in the future.
>>
>> You generally can't modify libfdt files. Any changes will be blown
>> away with the next dtc sync (there's one in -next now). Though here
>> you are creating a new location with fdt code. lib/ is just a shim to
>> the actual libfdt code. Don't put any implementation there. You can
>> add this to drivers/of/fdt_address.c for the short term, but it still
>> needs to go upstream.
>>
>> Otherwise, the implementation looks fine to me.
> 
> I agree, but I don't think there's a real need for us to hack
> drivers/of/fdt_address.c in the meantime -- let's just target upstream
> and not carry this in the kernel.
> 
> Akashi -- for now, I'll drop the kdump parts of this series which rely
> on this helper. The majority of the series is actually independent and
> can go in as-is.
> 
> I've pushed out a kexec branch to the arm64 tree for you to take a look
> at:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=kexec

I gave this a quick spin. Without the elfcorehdr/usable-memory-range arm64 needs
to explicitly forbid kdump via kexec_file_load. (like powerpc does already).
Without this kdump works, but the second kernel overwrites the first as those DT
properties are missing.

I'll post a patch momentarily,


Thanks,

James