linux-kernel - Re: [PATCH v4 5/7] arm64: Unconditionally call unflatten_device

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Date: Fri, 23 Feb 2024 10:23:45 +0000
From: Will Deacon <will@...nel.org>
To: Rob Herring <robh@...nel.org>
Cc: Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev, linux-um@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, kunit-dev@...glegroups.com,
	linux-kselftest@...r.kernel.org, devicetree@...r.kernel.org,
	Frank Rowand <frowand.list@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v4 5/7] arm64: Unconditionally call
 unflatten_device_tree()

On Thu, Feb 22, 2024 at 05:03:17PM -0700, Rob Herring wrote:
> On Fri, Feb 16, 2024 at 05:05:54PM -0800, Stephen Boyd wrote:
> > Call this function unconditionally so that we can populate an empty DTB
> > on platforms that don't boot with a firmware provided or builtin DTB.
> > When ACPI is in use, unflatten_device_tree() ignores the
> > 'initial_boot_params' pointer so the live DT on those systems won't be
> > whatever that's pointing to. Similarly, when kexec copies the DT data
> > the previous kernel to the new one on ACPI systems,
> > of_kexec_alloc_and_setup_fdt() will ignore the live DT (the empty root
> > one) and copy the 'initial_boot_params' data.
> > 
> > Cc: Rob Herring <robh+dt@...nel.org>
> > Cc: Frank Rowand <frowand.list@...il.com>
> > Cc: Catalin Marinas <catalin.marinas@....com>
> > Cc: Will Deacon <will@...nel.org>
> > Cc: Mark Rutland <mark.rutland@....com>
> > Cc: <linux-arm-kernel@...ts.infradead.org>
> > Signed-off-by: Stephen Boyd <sboyd@...nel.org>
> > ---
> >  arch/arm64/kernel/setup.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> Catalin, Will, Can I get an ack on this so I can take the series via the 
> DT tree.

Mark had strong pretty strong objections to this in version one:

https://lore.kernel.org/all/ZaZtbU9hre3YhZam@FVFF77S0Q05N/

and this patch looks the same now as it did then. Did something else
change?

Will