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

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Date:	Tue, 18 Nov 2014 00:14:19 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kevin Hilman <khilman@...aro.org>
Subject: Re: linux-next: build warning after merge of the pm tree

On Monday, November 17, 2014 12:31:43 PM Paul Bolle wrote:
> On Mon, 2014-11-17 at 13:44 +1100, Stephen Rothwell wrote:
> > Hi Rafael,
> > 
> > After merging the pm tree, today's linux-next build (arm multi_v7_defconfig)
> > produced this warning:
> > 
> > kernel/power/Kconfig:132:error: recursive dependency detected!
> > kernel/power/Kconfig:132:	symbol PM_RUNTIME is selected by PM_GENERIC_DOMAINS
> > kernel/power/Kconfig:272:	symbol PM_GENERIC_DOMAINS is selected by PM_RUNTIME
> > 
> > Caused by commit 9cdd5fd742e6 ("PM / domains: Kconfig: always enable
> > PM_RUNTIME when genpd enabled").
> 
> This error also popped up when I fiddled with omap2plus_defconfig on top
> of next-20141117. Note that I ended up with a .config which has
> CONFIG_ARCH_MULTI_V7 set. The error appears to be triggered by the
> Kconfig entry for ARCH_EXYNOS (in arch/arm/mach-exynos/Kconfig). It
> contains
>         select PM_GENERIC_DOMAINS if PM_RUNTIME
> 
> (Perhaps the :272: line needs rephrasing in the error Stephen quoted. It
> confused me quite a bit.)
> 
> Naively dropping that select statement from ARCH_EXYNOS triggered yet
> another error:
>     kernel/power/Kconfig:145:error: recursive dependency detected!
>     kernel/power/Kconfig:145:	symbol PM depends on PM_RUNTIME
>     kernel/power/Kconfig:132:	symbol PM_RUNTIME is selected by PM_GENERIC_DOMAINS
>     kernel/power/Kconfig:272:	symbol PM_GENERIC_DOMAINS is selected by PM
> 
> After that I admitted defeat.

I'll drop the commit for now, but this looks strange.

Had you cleaned up the kernel configuration after dropping the PM_RUNTIME select
from ARCH_EXYNOS?

Rafael

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