linux-kernel - Re: [PATCH] ARM: exynos_defconfig: Enable zram as loadable modules

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Date:   Mon, 10 Apr 2023 20:05:44 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Javier Martinez Canillas <javierm@...hat.com>,
        linux-kernel@...r.kernel.org
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Arnd Bergmann <arnd@...db.de>,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Robert Elliott <elliott@....com>,
        Russell King <linux@...linux.org.uk>,
        Stefan Hansson <newbie13xd@...il.com>,
        Sudeep Holla <sudeep.holla@....com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH] ARM: exynos_defconfig: Enable zram as loadable modules

On 10/04/2023 19:51, Javier Martinez Canillas wrote:
> Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> writes:
> 
>> On 10/04/2023 14:49, Javier Martinez Canillas wrote:
>>> Enable zram and dependencies as loadable modules. This allows to use the
>>> /dev/zramX virtual block devices as swap stored in system memory.
>>>
>>> Options were taken from commit 5c824e8be64d ("ARM: omap2plus_defconfig:
>>> Enable zram as loadable modules") that does the same for OMAP2+ platforms.
>>
>> Neither this commit msg nor above omap commit explain why do we want it.
>> I know what zram is, I know its purpose, but the commit should answer
>> why we want it in defconfig.
>>
>> To me it is not a matching defconfig at all:
>> 1. Not a feature related to Exynos hardware,
>> 2. Not needed for basic boot (systemd) or debug.
>>
> 
> It's needed for basic boot on distros that use swap on zram (i.e: Fedora).

ZSWAP could be for this as well, but none of them should be used to be
able to boot Fedora. If Fedora requires them, it's something broken
there. I can setup SWAP on my eMMC as well, so why would I need ZRAM?

Best regards,
Krzysztof