Re: linux-next: build warning after merge of the tegra tree

Dmitry Osipenko
2021-06-03T14:04:59Z

03.06.2021 15:18, Thierry Reding пишет:
> On Thu, Jun 03, 2021 at 05:01:48AM +0300, Dmitry Osipenko wrote:
>> 03.06.2021 03:35, Stephen Rothwell пишет:
>>> Hi all,
>>>
>>> After merging the tegra tree, today's linux-next build (x86_64
>>> allmodconfig) produced this warning:
>>>
>>> WARNING: unmet direct dependencies detected for TEGRA210_EMC_TABLE
>>> Depends on [n]: MEMORY [=y] && TEGRA_MC [=y] && ARCH_TEGRA_210_SOC [=n]
>>> Selected by [m]:
>>> - TEGRA210_EMC [=m] && MEMORY [=y] && TEGRA_MC [=y] && (ARCH_TEGRA_210_SOC [=n] || COMPILE_TEST [=y])
>>>
>>> Probably introduced by commit
>>>
>>> 08decdd5b448 ("memory: tegra: Enable compile testing for all drivers")
>>>
>>
>> Thank you. This is a new warning to me, apparently this case wasn't previously tested by kernel build bot.
>>
>> Perhaps this should fix it:
>>
>> diff --git a/drivers/memory/tegra/Kconfig b/drivers/memory/tegra/Kconfig
>> index 71bba2345bce..3f2fa7750118 100644
>> --- a/drivers/memory/tegra/Kconfig
>> +++ b/drivers/memory/tegra/Kconfig
>> @@ -47,7 +47,6 @@ config TEGRA124_EMC
>>
>> config TEGRA210_EMC_TABLE
>> bool
>> - depends on ARCH_TEGRA_210_SOC
>
> Why not just add a || COMPILE_TEST like we do for TEGRA210_EMC? Because
> TEGRA210_EMC being pulled in under COMPILE_TEST (and then pulling in
> TEGRA210_EMC_TABLE which is missing the alternative path) seems to be
> the root cause for this.

The anonymous Kconfig entry is unavailable by default, it can be only
selected by other entry, IIUC. In our case the TEGRA210_EMC_TABLE is
selected by TEGRA210_EMC, hence additional dependencies aren't needed
for TEGRA210_EMC_TABLE.