On Thu, Nov 13, 2014 at 10:10 PM, Pankaj Dubey <[email protected]> wrote: > +CC: Colin Cross, James Hogan > > On Thursday, November 13, 2014 11:30 PM, Nicolas Pitre wrote: >> To: Russell King - ARM Linux >> Cc: Pankaj Dubey; [email protected]; linux- >> [email protected] >> Subject: Re: [PATCH] ARM: b.L: fix unmet dependency for CPU_PM >> >> On Thu, 13 Nov 2014, Russell King - ARM Linux wrote: >> >> > On Thu, Nov 13, 2014 at 12:44:22PM -0500, Nicolas Pitre wrote: >> > > On Thu, 13 Nov 2014, Pankaj Dubey wrote: >> > > >> > > > If BL_SWITCHER is enabled but SUSPEND and CPU_IDLE is not enabled >> > > > we are getting following config warning. >> > > > >> > > > warning: (BL_SWITCHER) selects CPU_PM which has unmet direct >> > > > dependencies (SUSPEND || CPU_IDLE) >> > > > >> > > > So BL_SWITCHER should enable CPU_PM only if either of SUSPEND or >> > > > CPU_IDLE is selected. >> > > > >> > > > Signed-off-by: Pankaj Dubey <[email protected]> >> > > > --- >> > > > arch/arm/Kconfig | 2 +- >> > > > 1 file changed, 1 insertion(+), 1 deletion(-) >> > > > >> > > > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index >> > > > 9d580d0..fe3d969 100644 >> > > > --- a/arch/arm/Kconfig >> > > > +++ b/arch/arm/Kconfig >> > > > @@ -1417,7 +1417,7 @@ config BL_SWITCHER >> > > > bool "big.LITTLE switcher support" >> > > > depends on BIG_LITTLE && MCPM && HOTPLUG_CPU >> > > > select ARM_CPU_SUSPEND >> > > > - select CPU_PM >> > > > + select CPU_PM if (SUSPEND || CPU_IDLE) >> > > >> > > NAK. You just broke the code by doing this. CPU_PM is a requirement >> > > here. The dependencies for CPU_PM is lacking. >> > > > OK, got it. Even though compilation worked, but as you mentioned by doing > this way > bL_switcher functionality may broke. > >> > Is there any real technical reason that CPU_PM depends on SUSPEND || >> > CPU_IDLE ? If not, those dependencies should be killed. >> >> Those dependencies look artificial to me. >> > > For me also it looks like these dependencies are artificial. > As far as I can see CONFIG_CPU_PM compiles following two files > 1: kernel/cpu_pm.c - I can't see any dependency of SUSPEND or CPU_IDLE in > this file. > 2: arch/mips/kernel/pm.c: A quick look does not show any dependency of > SUSPEND or > CPU_IDLE here too. > > So for me it looks like it is OK to kill these dependencies of CPU_PM. > Still safer side I am CCing this to author of these files for confirmation. > > Thanks, > Pankaj Dubey >> >> Nicolas >
I agree, the dependencies in kernel/power/Kconfig should be removed. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
