svn commit: r189313 - head/sys/kern

[Dmitry Chagin]

Author: dchagin
Date: Tue Mar  3 17:34:09 2009
New Revision: 189313
URL: http://svn.freebsd.org/changeset/base/189313

Log:
  as suggested by jhb@, panic in case the ncpus == 0.
  it helps to catch bugs in the callers.
  
  Approved by:	kib (mentor)
  MFC after:	5 days

Modified:
  head/sys/kern/subr_smp.c

Modified: head/sys/kern/subr_smp.c
==============================================================================
--- head/sys/kern/subr_smp.c	Tue Mar  3 17:16:26 2009	(r189312)
+++ head/sys/kern/subr_smp.c	Tue Mar  3 17:34:09 2009	(r189313)
@@ -366,7 +366,7 @@ smp_rendezvous_cpus(cpumask_t map,
 		if (((1 << i) & map) != 0 && !CPU_ABSENT(i))
 			ncpus++;
 	if (ncpus == 0)
-		return;
+		panic("ncpus is 0 with map=0x%x", map);
 
 	/* obtain rendezvous lock */
 	mtx_lock_spin(&smp_ipi_mtx);