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

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Date:   Thu, 3 Jun 2021 14:18:49 +0200
From:   Thierry Reding <treding@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>
CC:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Colin Cross <ccross@...roid.com>,
        Olof Johansson <olof@...om.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warning after merge of the tegra tree

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.

Thierry

>  
>  config TEGRA210_EMC
>  	tristate "NVIDIA Tegra210 External Memory Controller driver"
> 
> 
> Thierry, please squash this change into the original patch if it looks good to you.

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