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

[Michael Ellerman]

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 at ellerman.id.au>
---
 arch/powerpc/platforms/Kconfig.cputype | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

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