powerpc: Allow platforms to force-enable CONFIG_SMP

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.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index ef4c4b8fc5470b07df2de308d469950de9783913..ee87cb37c580a4de59a61f217fff790b354b7385 100644 (file)
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -371,10 +371,16 @@ 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
        select GENERIC_IRQ_MIGRATION
-       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