Re: [PATCH] Kconfig powernow-k8 driver should depend on ACPI P-Statesdriver

[Ed Sweetman]

Joshua Hoblitt wrote:
> On Wed, May 16, 2007 at 04:04:40PM -0400, Daniel Drake wrote:
>   
> > Duane Griffin wrote:
> >     
> > > On 16/05/07, Prakash Punnoor <prakash@xxxxxxxxxx> wrote:
> > >       
> > > > Maybe you want to give a hint in the p states driver help text?
> > > >         
> > > I think a hint is the right thing to do, but in the PowerNow! driver
> > > rather than the p states one. How about adding something like this to
> > > the X86_POWERNOW_K8 (and X86_POWERNOW_K7?) help text:
> > >       
> > Please hold off this patch until we've gained a more complete 
> > understanding of the issues and workarounds (which will probably lead to 
> > us writing a better patch anyway)
> >     
>
> I agree - the issue is more complicated that I had thought.  I received
> an off list message saying that this dependency isn't required on a
> single-socket Athlon X2 system.  So it sounds like isn't an SMP setup
> issue as much as it is a multi-socket or perhaps just an issue with my
> vendor (Tyan).
>
> -J
>
> --
>   
Like i mentioned off list, the problem here is that cpu freq modules 
dont depend (Kconfig) on CONFIG_ACPI_PROCESSOR, yet they do.  Even the 
help text of CONFIG_ACPI_PROCESSOR says this.  I'm unsure as to why the 
drivers that do, dont make the dependency known to Kconfig, since 
obviously the writer of acpi_processor knew the dependency existed.

Simple fix would be to just include the depends line for 
CONFIG_ACPI_PROCESSOR for the powernow driver, and any others people 
wonna test.   I suspect most people just compile in the acpi_processor 
driver, never seeing this problem occur.


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