[PATCH] Configurable NODES_SHIFT

Current implementations define NODES_SHIFT in include/asm-xxx/numnodes.h for
each arch.  Its definition is sometimes configurable.  Indeed, ia64 defines 5
NODES_SHIFT values in the current git tree.  But it looks a bit messy.

SGI-SN2(ia64) system requires 1024 nodes, and the number of nodes already has
been changeable by config.  Suitable node's number may be changed in the
future even if it is other architecture.  So, I wrote configurable node's
number.

This patch set defines just default value for each arch which needs multi
nodes except ia64.  But, it is easy to change to configurable if necessary.

On ia64 the number of nodes can be already configured in generic ia64 and SN2
config.  But, NODES_SHIFT is defined for DIG64 and HP'S machine too.  So, I
changed it so that all platforms can be configured via CONFIG_NODES_SHIFT.  It
would be simpler.

See also: http://marc.theaimsgroup.com/?l=linux-kernel&m=114358010523896&w=2

Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Andi Kleen <ak@muc.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 10 insertions, 9 deletions

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index edffe25a477a..9f40eeff0b5c 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -260,15 +260,6 @@ config NR_CPUS
           than 64 will cause the use of a CPU mask array, causing a small
           performance hit.
 
-config IA64_NR_NODES
-        int "Maximum number of NODEs (256-1024)" if (IA64_SGI_SN2 || IA64_GENERIC)
-        range 256 1024
-        depends on IA64_SGI_SN2 || IA64_GENERIC
-        default "256"
-        help
-          This option specifies the maximum number of nodes in your SSI system.
-          If in doubt, use the default.
-
 config HOTPLUG_CPU
         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
         depends on SMP && EXPERIMENTAL
@@ -352,6 +343,16 @@ config NUMA
           Access).  This option is for configuring high-end multiprocessor
           server systems.  If in doubt, say N.
 
+config NODES_SHIFT
+        int "Max num nodes shift(3-10)"
+        range 3 10
+        default "8"
+        depends on NEED_MULTIPLE_NODES
+        help
+          This option specifies the maximum number of nodes in your SSI system.
+          MAX_NUMNODES will be 2^(This value).
+          If in doubt, use the default.
+
 # VIRTUAL_MEM_MAP and FLAT_NODE_MEM_MAP are functionally equivalent.
 # VIRTUAL_MEM_MAP has been retained for historical reasons.
 config VIRTUAL_MEM_MAP