Received-SPF: pass (google.com: domain of linux-kernel+bounces-78118-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) client-ip=147.75.80.249;
Date: Fri, 23 Feb 2024 10:23:45 +0000
From: Will Deacon <will@kernel.org>
To: Rob Herring <robh@kernel.org>
Cc: Stephen Boyd <sboyd@kernel.org>, linux-kernel@vger.kernel.org,
	patches@lists.linux.dev, linux-um@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org, kunit-dev@googlegroups.com,
	linux-kselftest@vger.kernel.org, devicetree@vger.kernel.org,
	Frank Rowand <frowand.list@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH v4 5/7] arm64: Unconditionally call
 unflatten_device_tree()
Message-ID: <20240223102345.GA10274@willie-the-truck>
References: <20240217010557.2381548-1-sboyd@kernel.org>
 <20240217010557.2381548-6-sboyd@kernel.org>
 <20240223000317.GA3835346-robh@kernel.org>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20240223000317.GA3835346-robh@kernel.org>
User-Agent: Mutt/1.10.1 (2018-07-13)

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@kernel.org>
> > Cc: Frank Rowand <frowand.list@gmail.com>
> > Cc: Catalin Marinas <catalin.marinas@arm.com>
> > Cc: Will Deacon <will@kernel.org>
> > Cc: Mark Rutland <mark.rutland@arm.com>
> > Cc: <linux-arm-kernel@lists.infradead.org>
> > Signed-off-by: Stephen Boyd <sboyd@kernel.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