linux-kernel - Re: [PATCH v4 14/16] PM / devfreq: tegra: Enable COMPILE

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Message-ID: <20190604141824.GC397@ulmo>
Date:   Tue, 4 Jun 2019 16:18:24 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 14/16] PM / devfreq: tegra: Enable COMPILE_TEST for
 the driver

On Tue, Jun 04, 2019 at 04:10:31PM +0200, Thierry Reding wrote:
> On Tue, Jun 04, 2019 at 04:53:17PM +0300, Dmitry Osipenko wrote:
> > 04.06.2019 14:20, Thierry Reding пишет:
> > > On Thu, May 02, 2019 at 02:38:13AM +0300, Dmitry Osipenko wrote:
> > >> The driver's compilation doesn't have any specific dependencies, hence
> > >> the COMPILE_TEST option can be supported in Kconfig.
> > >>
> > >> Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>
> > >> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> > >> ---
> > >>  drivers/devfreq/Kconfig | 2 +-
> > >>  1 file changed, 1 insertion(+), 1 deletion(-)
> > >>
> > >> diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig
> > >> index 56db9dc05edb..a6bba6e1e7d9 100644
> > >> --- a/drivers/devfreq/Kconfig
> > >> +++ b/drivers/devfreq/Kconfig
> > >> @@ -93,7 +93,7 @@ config ARM_EXYNOS_BUS_DEVFREQ
> > >>  
> > >>  config ARM_TEGRA_DEVFREQ
> > >>  	tristate "NVIDIA Tegra30/114/124/210 DEVFREQ Driver"
> > >> -	depends on ARCH_TEGRA
> > >> +	depends on ARCH_TEGRA || COMPILE_TEST
> > >>  	select PM_OPP
> > >>  	help
> > >>  	  This adds the DEVFREQ driver for the Tegra family of SoCs.
> > > 
> > > You need to be careful with these. You're using I/O register accessors,
> > > which are not supported on the UM architecture, for example.
> > > 
> > > This may end up getting flagged during build testing.
> > 
> > We have similar cases in other drivers and it doesn't cause any known
> > problems because (I think) build-bots are aware of this detail. Hence
> 
> I don't understand how the build-bots would be aware of this detail.
> Unless you explicitly state what the dependencies are, how would the
> build-bots know? Perhaps there's some logic built-in somewhere that I
> don't know about?

So looks like COMPILE_TEST has a !UML dependency, so this might just
work.

Acked-by: Thierry Reding <treding@...dia.com>

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