[PATCH] ia64: update Kconfig comment for NR_CPUS

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index a34c4788b99e01e2adc9dfe68b94316d0eebe093..c359b37b1c3e2a814ce2163868bd56a80f5c2390 100644 (file)
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -424,9 +424,15 @@ config EFI_VARS
          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"