update Kconfig comment for NR_CPUS

Noticed this when I built a kernel for a 256p machine.

Jesse

=== arch/ia64/Kconfig 1.42 vs edited ==--- 1.42/arch/ia64/Kconfig Mon Sep 8 16:15:14 2003
+++ edited/arch/ia64/Kconfig Tue Sep 9 16:55:14 2003
@@ -424,9 +424,15 @@
support" (CONFIG_PROC_FS) is enabled, too.

config NR_CPUS
- int "Maximum number of CPUs (2-64)"
+ int "Maximum number of CPUs"
depends on SMP
default "64"
+ help

+	  You should set this to the number of CPUs in your system, but
+	  keep in mind that a kernel compiled for e.g. 2 CPUs will boot but
+	  only use 2 CPUs on a >2 CPU system.  Setting this to a value larger
+	  than 64 will cause the use of a CPU mask array, causing a small
+	  performance hit.

source "fs/Kconfig.binfmt"