linux-hardening - Re: [PATCH v7 08/10] arm64: Kconfig.platforms: Add config for Marvell PXA1908 platform

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Date: Fri, 3 Nov 2023 17:51:39 +0000
From: Robin Murphy <robin.murphy@....com>
To: Duje Mihanović <duje.mihanovic@...le.hr>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Linus Walleij <linus.walleij@...aro.org>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Tony Lindgren <tony@...mide.com>,
 Daniel Mack <daniel@...que.org>, Haojian Zhuang <haojian.zhuang@...il.com>,
 Robert Jarzmik <robert.jarzmik@...e.fr>, Liam Girdwood
 <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
 Leo Yan <leoy@...vell.com>, Zhangfei Gao <zhangfei.gao@...vell.com>,
 Lubomir Rintel <lkundrak@...sk>, Catalin Marinas <catalin.marinas@....com>,
 Will Deacon <will@...nel.org>, Kees Cook <keescook@...omium.org>,
 Tony Luck <tony.luck@...el.com>, "Guilherme G . Piccoli"
 <gpiccoli@...lia.com>
Cc: linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
 alsa-devel@...a-project.org, linux-hardening@...r.kernel.org,
 phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
 Karel Balej <balejk@...fyz.cz>
Subject: Re: [PATCH v7 08/10] arm64: Kconfig.platforms: Add config for Marvell
 PXA1908 platform

On 2023-11-03 5:02 pm, Duje Mihanović wrote:
> On Friday, November 3, 2023 4:34:54 PM CET Robin Murphy wrote:
>> On 2023-11-02 3:20 pm, Duje Mihanović wrote:
>>> +config ARCH_MMP
>>> +	bool "Marvell MMP SoC Family"
>>> +	select ARM_GIC
>>> +	select ARM_ARCH_TIMER
>>> +	select ARM_SMMU
>>
>> NAK, not only is selecting user-visible symbols generally frowned upon,
>> and ignoring their dependencies even worse, but for a multiplatform
>> kernel the user may well want this to be a module.
>>
>> If having the SMMU driver built-in is somehow fundamentally required for
>> this platform to boot, that would represent much bigger problems.
> 
> The SoC can boot without SMMU and PDMA, but not GIC, pinctrl or the arch
> timer. I see that most other SoCs still select drivers and frameworks they
> presumably need for booting, with the exceptions of ARCH_BITMAIN, ARCH_LG1K
> and a couple others. Which of these two options should I go for?

Well, you don't really need to select ARM_GIC or ARM_ARCH_TIMER here 
either, since those are already selected by ARM64 itself. Keeping 
PINCTRL_SINGLE is fair, although you should also select PINCTRL as its 
dependency.

As an additional nit, the file seems to be primarily ordered by symbol 
name, so it might be nice to slip ARCH_MMC in between ARCH_MESON and 
ARCH_MVEBU.

Cheers,
Robin.