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From: Javier Martinez Canillas <javierm@redhat.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
 linux-kernel@vger.kernel.org
Cc: Enric Balletbo i Serra <eballetbo@redhat.com>, Maxime Ripard
 <mripard@redhat.com>, Erico Nunes <nunes.erico@gmail.com>, Brian Masney
 <bmasney@redhat.com>, Arnd Bergmann <arnd@arndb.de>, Bjorn Andersson
 <quic_bjorande@quicinc.com>, Catalin Marinas <catalin.marinas@arm.com>,
 Geert Uytterhoeven <geert+renesas@glider.be>, Konrad Dybcio
 <konrad.dybcio@linaro.org>, Marek Szyprowski <m.szyprowski@samsung.com>,
 Neil Armstrong <neil.armstrong@linaro.org>, Will Deacon <will@kernel.org>,
 linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2] arm64: defconfig: Enable zram, xfs and loading
 compressed FW support
In-Reply-To: <1f28256c-e436-4add-aa67-2cfb2248b220@linaro.org>
References: <20240221141350.3740488-1-javierm@redhat.com>
 <1f28256c-e436-4add-aa67-2cfb2248b220@linaro.org>
Date: Wed, 21 Feb 2024 15:55:04 +0100
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Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> writes:

> On 21/02/2024 15:13, Javier Martinez Canillas wrote:
>> These options are needed by some Linux distributions (e.g: Fedora), so
>
> How ZRAM is needed? Why Fedora cannot boot without it? Debian, which I
> use on my arm64 boards, does not have any problem.
>

I haven't used Debian in ages so I don't know why is not a problem there.

But Fedora is using zram by default and if is not enabled in the kernel,
the boot is delayed considerably due the systemd zram-generator.

> I kind of repeat comments from similar patch earlier:
> https://lore.kernel.org/all/fe1e74a2-e933-7cd9-f740-86d871076191@linaro.org/
>

Ah! I forgot that posted the same change for exynos_defconfig some time
ago and I see that you nacked. Now I understand why all my Exynos boards
are in a drawer.

> About XFS: I don't think it is needed to boot anything.
>

How are you supposed to mount a XFS rootfs without at least have support
for it as a module?

> This is a defconfig, not a distro config. Please don't make it distro.
>

It seems that's a Debian distro config though, since you brought Debian as
an example.

> I will gladly support things needed by systemd or equivalent, but not
> unusual filesystems needed by distro.
>

Fair. But then you should probably remove all the other filesystems that are
already in the defconfig then?

$ grep "_FS=" arch/arm64/configs/defconfig | wc -l
15

Or it is OK to have support for btrfs, overlayfs, even plan9 fs but XFS is
where you draw the line??

> Best regards,
> Krzysztof
>

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat