linux-kernel - Re: [PATCH v2 00/12] arm64: Kconfig: Update ARCH

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Message-ID: <YVWu2RoSqEzcG79I@google.com>
Date:   Thu, 30 Sep 2021 13:34:33 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Will McVicker <willmcvicker@...gle.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Saravana Kannan <saravanak@...gle.com>,
        "Cc: Android Kernel" <kernel-team@...roid.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-rtc@...r.kernel.org, Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v2 00/12] arm64: Kconfig: Update ARCH_EXYNOS select
 configs

On Thu, 30 Sep 2021, Krzysztof Kozlowski wrote:
> >   It sounds like a lack of testing is your main concern.
> > 
> >   How can I help here?  What H/W do I need to be able to fully test this?
> 
> The changes here need to be tested on affected platforms (ARMv7 and
> ARMv8), when built as a modules on some types of regular distros (e.g.
> Arch, Ubuntu). From each of such boot I would be happy to see number of
> new dmesg warnings/errors plus number of probe deferrals.
> 
> Since the drivers could be switched to modules (and some distros might
> do it), they might be hit by surprise regressions in boot performance
> due to probe deferrals. This should be also checked on these platforms.
> Geert pointed out before that clocks in many cases are not optional -
> driver needs them and will wait defer.
> 
> Assuming of course that boot succeeds. Minor differences in boot speed
> should not be a problem, I think, because distro anyway chosen
> all-module approach so it accepts the penalty.

Do you have any suggestions in terms of devboards?

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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