2 files changed, 22 insertions, 7 deletions

diff --git a/arch/mips/sgi-ip27/Kconfig b/arch/mips/sgi-ip27/Kconfig
index 4b7c3c675174..f14ef38646d0 100644
--- a/arch/mips/sgi-ip27/Kconfig
+++ b/arch/mips/sgi-ip27/Kconfig
@@ -4,14 +4,29 @@
 #         This options adds support for userspace processes upto 16TB size.
 #         Normally the limit is just .5TB.
 
+choice
+        prompt "Node addressing mode"
+        depends on SGI_IP27
+        default SGI_SN_M_MODE
+
+config SGI_SN_M_MODE
+        bool "IP27 M-Mode"
+        help
+          The nodes of Origin, Onyx, Fuel and Tezro systems can be configured
+          in either N-Modes which allows for more nodes or M-Mode which allows
+          for more memory.  Your hardware is almost certainly running in
+          M-Mode, so choose M-mode here.
+
 config SGI_SN_N_MODE
         bool "IP27 N-Mode"
-        depends on SGI_IP27
+        depends on EXPERIMENTAL
         help
-          The nodes of Origin 200, Origin 2000 and Onyx 2 systems can be
-          configured in either N-Modes which allows for more nodes or M-Mode
-          which allows for more memory.  Your system is most probably
-          running in M-Mode, so you should say N here.
+          The nodes of Origin, Onyx, Fuel and Tezro systems can be configured
+          in either N-Modes which allows for more nodes or M-Mode which allows
+          for more memory.  Your hardware is almost certainly running in
+          M-Mode, so choose M-mode here.
+
+endchoice
 
 config MAPPED_KERNEL
         bool "Mapped kernel support"
diff --git a/include/asm-mips/sn/sn0/arch.h b/include/asm-mips/sn/sn0/arch.h
index 0ecbaa0d3837..f7c43fa24aa8 100644
--- a/include/asm-mips/sn/sn0/arch.h
+++ b/include/asm-mips/sn/sn0/arch.h
@@ -59,9 +59,9 @@
  */
 #ifdef CONFIG_SGI_SN_N_MODE
 #define MAX_MEM_SLOTS   16                      /* max slots per node */
-#else /* !CONFIG_SGI_SN_N_MODE, assume M_MODE */
+#else /* !CONFIG_SGI_SN_N_MODE, assume CONFIG_SGI_SN_M_MODE */
 #define MAX_MEM_SLOTS   32                      /* max slots per node */
-#endif /* defined(N_MODE) */
+#endif /* CONFIG_SGI_SN_M_MODE */
 
 #define SLOT_SHIFT              (27)
 #define SLOT_MIN_MEM_SIZE       (32*1024*1024)