[RFC PATCH 1/3] powerpc: Allow platforms to force-enable CONFIG_SMP

[Michael Ellerman]

Michael Ellerman <mpe at ellerman.id.au> writes:

> Of the 64-bit Book3S platforms, only powermac supports booting on an
> actual non-SMP system. The other platforms can be built with SMP
> disabled, but it doesn't make a lot of sense given the CPUs they support
> are all multicore or multithreaded.
>
> So give platforms the option of forcing SMP=y.

For the record I'm planning to merge this.

cheers

> diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
> index 99b0ae8acb78..5c011e4baf0b 100644
> --- a/arch/powerpc/platforms/Kconfig.cputype
> +++ b/arch/powerpc/platforms/Kconfig.cputype
> @@ -371,9 +371,15 @@ config PPC_PERF_CTRS
>         help
>           This enables the powerpc-specific perf_event back-end.
>  
> +config FORCE_SMP
> +	# Allow platforms to force SMP=y by selecting this
> +	bool
> +	default n
> +	select SMP
> +
>  config SMP
>  	depends on PPC_BOOK3S || PPC_BOOK3E || FSL_BOOKE || PPC_47x
> -	bool "Symmetric multi-processing support"
> +	bool "Symmetric multi-processing support" if !FORCE_SMP
>  	---help---
>  	  This enables support for systems with more than one CPU. If you have
>  	  a system with only one CPU, say N. If you have a system with more
> -- 
> 2.7.4