linux-kernel - Re: [PATCH QUESTION] arm64: configs: Add Snapdragon 845 config fragment

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Message-ID: <aSdCryMAOb7Qk-qq@arm.com>
Date: Wed, 26 Nov 2025 18:10:55 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: David Heidelberg via B4 Relay <devnull+david.ixit.cz@...nel.org>
Cc: David Heidelberg <david@...t.cz>, Will Deacon <will@...nel.org>,
	Casey Connolly <casey.connolly@...aro.org>,
	Casey Connolly <casey@...nolly.tech>,
	Joel Selvaraj <foss@...lselvaraj.com>,
	Alexander Martinz <amartinz@...ftphones.com>,
	Dzmitry Sankouski <dsankouski@...il.com>,
	Pablo Correa Gómez <ablocorrea@...mail.com>,
	Guido Günther <agx@...xcpu.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	phone-devel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH QUESTION] arm64: configs: Add Snapdragon 845 config
 fragment

On Wed, Nov 26, 2025 at 05:19:20PM +0100, David Heidelberg via B4 Relay wrote:
> From: Casey Connolly <casey.connolly@...aro.org>
> 
> This fragment provides reasonable default for the mobile devices
> based on Snapdragon 845 architecture. While default config could be
> used, the reality is it brings many issues to the development workflows,
> which are much harder to address than on generic boards or devices with
> available UART console.
> 
> This config fragment produces the .config used by distributions.
> It is designed to be fairly minimal and specific to the
> supported SDM845 devices whilst offering all the features you would
> expect.
> 
> It disables other arm64 architectures to speed up build times and
> decrease the size of the kernel image.
> 
> To generate a .config use "make defconfig sdm845.config"
> 
> [David]
>  - Dropped distribution specific options.
>  - Added entry into the MAINTAINERS file.
[...]
>  MAINTAINERS                      |    5 +
>  arch/arm64/configs/sdm845.config | 1048 ++++++++++++++++++++++++++++++++++++++
>  2 files changed, 1053 insertions(+)

I really don't think the kernel should carry configs other than the
generic ones used by developers. We had this on arm32 but mostly because
we didn't have a single kernel image for a long time (and when we got
it, it was mostly for v7 cores). I don't want to get back to hosting a
multitude of configs in mainline.

-- 
Catalin