[SPARC64]: Add SMT scheduling support for Niagara.

The mapping is a simple "(cpuid >> 2) == core" for now.
Later we'll add more sophisticated code that will walk
the sun4v machine description and figure this out from
there.

We should also add core mappings for jaguar and panther
processors.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig
index a253a39c3ff6..49b652f9b1d8 100644
--- a/arch/sparc64/Kconfig
+++ b/arch/sparc64/Kconfig
@@ -356,6 +356,15 @@ config SOLARIS_EMUL
 
 endmenu
 
+config SCHED_SMT
+        bool "SMT (Hyperthreading) scheduler support"
+        depends on SMP
+        default y
+        help
+          SMT scheduler support improves the CPU scheduler's decision making
+          when dealing with UltraSPARC cpus at a cost of slightly increased
+          overhead in some places. If unsure say N here.
+
 config CMDLINE_BOOL
         bool "Default bootloader kernel arguments"