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Even the original patch dating back to 2008, >>>> aab46da0520a ("cpumask: Add CONFIG_CPUMASK_OFFSTACK") didn't give any >>>> rationale for such dependency. >>>> >>>> Nowhere in the code supports the presumption that DEBUG_PER_CPU_MAPS is >>>> necessary for CONFIG_CPUMASK_OFFSTACK. Make no mistake, it's good to >>>> have DEBUG_PER_CPU_MAPS for debugging purpose or precaution, but it's >>>> simply not a hard requirement for CPUMASK_OFFSTACK. Moreover, x86 Kconfig >>>> already can set CPUMASK_OFFSTACK=y without DEBUG_PER_CPU_MAPS=y. >>>> There is no reason other architectures cannot given the fact that they >>>> have even fewer, if any, arch-specific CONFIG_DEBUG_PER_CPU_MAPS code than >>>> x86. >>>> >>>> Signed-off-by: Libo Chen >>>> --- >>>>   lib/Kconfig | 2 +- >>>>   1 file changed, 1 insertion(+), 1 deletion(-) >>>> >>>> diff --git a/lib/Kconfig b/lib/Kconfig >>>> index 087e06b4cdfd..7209039dfb59 100644 >>>> --- a/lib/Kconfig >>>> +++ b/lib/Kconfig >>>> @@ -511,7 +511,7 @@ config CHECK_SIGNATURE >>>>       bool >>>>     config CPUMASK_OFFSTACK >>>> -    bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS >>> This "if" dependency only controls whether the Kconfig symbol's prompt is >>> displayed (presented) in kconfig tools. Removing it makes the prompt always >>> be displayed. >>> >>> Any architecture could select (should be able to) CPUMASK_OFFSTACK independently >>> of DEBUG_PER_CPU_MAPS. >> Do you mean changing arch/xxxx/Kconfig to select CPUMASK_OFFSTACK under some config xxx? That will work but it requires code changes for each architecture. >> But if you are talking about setting CONFIG_CPUMASK_OFFSTACK=y without CONFIG_DEBUG_PER_CPU_MAPS directly in config file, I have tried, it doesn't work. > I'm just talking about the Kconfig change below. Not talking about whatever else > it might require per architecture. > > But you say you have tried that and it doesn't work. What part of it doesn't work? > The Kconfig part or some code execution? oh the Kconfig part. For example, make olddefconfig on a config file with CPUMASK_OFFSTACK=y only turns off CPUMASK_OFFSTACK unless I explicitly set DEBUG_PER_CPU_MAPS=y Libo > I'll test the Kconfig part of it later (in a few hours). > >> Libo >>> Is there another problem here? >>> >>>> +    bool "Force CPU masks off stack" >>>>       help >>>>         Use dynamic allocation for cpumask_var_t, instead of putting >>>>         them on the stack.  This is a bit more expensive, but avoids