linux-kernel - Re: [PATCH v7 11/11] arm64: defconfig: Enable OF

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Message-ID: <ab88fe2a-4f59-47d1-855b-517d98773f3c@gmx.net>
Date: Sat, 8 Feb 2025 14:42:15 +0100
From: Stefan Wahren <wahrenst@....net>
To: Andrea della Porta <andrea.porta@...e.com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
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 Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczynski <kw@...ux.com>,
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 Bjorn Helgaas <bhelgaas@...gle.com>, Linus Walleij
 <linus.walleij@...aro.org>, Catalin Marinas <catalin.marinas@....com>,
 Will Deacon <will@...nel.org>, Bartosz Golaszewski <brgl@...ev.pl>,
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 devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
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 Masahiro Yamada <masahiroy@...nel.org>,
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 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v7 11/11] arm64: defconfig: Enable OF_OVERLAY option

Hi Andrea,

Am 07.02.25 um 22:31 schrieb Andrea della Porta:
> The RP1 driver uses the infrastructure enabled by OF_OVERLAY config
> option. Enable that option in defconfig in order to produce a kernel
> usable on RaspberryPi5 avoiding to enable it separately.
>
> Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
> ---
> This patch is *OPTIONAL* since I'm not sure if OF_OVERLAY is a desirable
> feature to have enabled by default. It would be advisable to have it included
> so that 'make defconfig' can produce a kernel config that will work out
> of the box on Rpi5, otherwise OF_OVERLAY has to be enabled separately.
I think this isn't a good approach to convince the arm64 maintainer.
This change is not really optional for the Raspberry Pi 5 and possible
users/testers/CI rely on a working default configuration.

So my first suggestion would be to provide a scripts/bloat-o-meter
output (before/after). Based on this the maintainer can better decided.

In case this change is still rejected, we still have the option of
something like this [1]

Best regards

[1] -
https://patchwork.kernel.org/project/linux-kbuild/patch/20200203184820.4433-3-nsaenzjulienne@suse.de/