linux-kernel - Re: [PATCH v6 08/14] memory: tegra: Enable compile testing for all drivers

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Date:   Mon, 7 Jun 2021 16:42:41 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Dmitry Osipenko <digetx@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Nikola Milosavljević <mnidza@...look.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Matt Merhar <mattmerhar@...tonmail.com>,
        Paul Fertser <fercerpav@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        devicetree@...r.kernel.org, linux-pm@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH v6 08/14] memory: tegra: Enable compile testing for all
 drivers

On 07/06/2021 16:19, Thierry Reding wrote:
> On Mon, Jun 07, 2021 at 05:01:02PM +0300, Dmitry Osipenko wrote:
>> 07.06.2021 16:36, Thierry Reding пишет:
>>>> /bin/ld: warning: orphan section `__reservedmem_of_table' from `drivers/memory/tegra/tegra210-emc-table.o' being placed in section `__reservedmem_of_table'
>>>> /bin/ld: drivers/memory/tegra/mc.o: in function `tegra_mc_probe':
>>>> mc.c:(.text+0x87a): undefined reference to `reset_controller_register'
>>>> make[1]: *** [/home/buildbot/worker/builddir/build/Makefile:1191: vmlinux] Error 1
>> ...
>>
>>> Not sure what to do about that orphaned __reservedmem_of_table section.
>>> Maybe all we need to do is to select OF_RESERVED_MEM from
>>> TEGRA210_EMC_TABLE?
>>
>> Select won't work easily, but the dependency for TEGRA210_EMC should.
> 
> Select works if I also select OF_EARLY_FLATTREE. That's slightly odd
> because typically that's something that the platform would select, but
> there's precedent for doing this in drivers/clk/x86/Kconfig, so I think
> it'd be fine.
> 
> The attached patch resolves both of the above issues for me.
> 
> Krzysztof: do you want to squash that into the problematic patch or do
> you want me to send this as a follow-up patch for you to apply? I guess
> the latter since you've already sent out the PR for Will and ARM SoC?

Follow up, please, but I am not sure about selecting reset controller.
>From the tegra/mc.c code I see it can be optional - if "reset_ops" is
provided. Therefore I think:
1. Reset controller should provide proper stubs. This will fix building
of mc.c when reset controller is not chosen (regardless of point #2 below).

2. Specific drivers should depend on it. Selecting user-visible symbols
is rather discourage because might lead to circular dependencies.

Best regards,
Krzysztof