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

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Message-ID: <20240223000317.GA3835346-robh@kernel.org>
Date: Thu, 22 Feb 2024 17:03:17 -0700
From: Rob Herring <robh@...nel.org>
To: Stephen Boyd <sboyd@...nel.org>
Cc: 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>,
	Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v4 5/7] arm64: Unconditionally call
 unflatten_device_tree()

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.

Rob