Say that NCPUS is an upper bound and that more detected CPUs boot with
min(eligible, NCPUS).
---
 configfrag-first.ac | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configfrag-first.ac b/configfrag-first.ac
index 22e34af..9ed1f45 100644
--- a/configfrag-first.ac
+++ b/configfrag-first.ac
@@ -27,7 +27,8 @@ AC_ARG_ENABLE([pae],
 # Multiprocessor support is still broken.
 AH_TEMPLATE([MULTIPROCESSOR], [set things up for a uniprocessor])
 AC_ARG_ENABLE([ncpus],
-  AS_HELP_STRING([--enable-ncpus=N], [specify the maximum number of cpus to be 
supported]),
+  AS_HELP_STRING([--enable-ncpus=N], [compile-time upper bound on supported 
CPUs;
+    a valid APIC topology with more detected CPUs boots with min(eligible, 
N)]),
   [mach_ncpus=$enable_ncpus],
   [mach_ncpus=1])
 AC_DEFINE_UNQUOTED([NCPUS], [$mach_ncpus], [number of CPUs])

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