Fix race condition in active cpu count.

Change-Id: I3a8a6a521d219a55600b3370fb75a25b8ed085be
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/1154
Tested-by: Jenkins Server
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>

1 files changed, 24 insertions, 23 deletions

diff --git a/src/kernel/cpumgr.C b/src/kernel/cpumgr.C
index f995eb543..3bb52b63c 100644
--- a/src/kernel/cpumgr.C
+++ b/src/kernel/cpumgr.C
@@ -1,25 +1,26 @@
-//  IBM_PROLOG_BEGIN_TAG
-//  This is an automatically generated prolog.
-//
-//  $Source: src/kernel/cpumgr.C $
-//
-//  IBM CONFIDENTIAL
-//
-//  COPYRIGHT International Business Machines Corp. 2010 - 2011
-//
-//  p1
-//
-//  Object Code Only (OCO) source materials
-//  Licensed Internal Code Source Materials
-//  IBM HostBoot Licensed Internal Code
-//
-//  The source code for this program is not published or other-
-//  wise divested of its trade secrets, irrespective of what has
-//  been deposited with the U.S. Copyright Office.
-//
-//  Origin: 30
-//
-//  IBM_PROLOG_END
+/*  IBM_PROLOG_BEGIN_TAG
+ *  This is an automatically generated prolog.
+ *
+ *  $Source: src/kernel/cpumgr.C $
+ *
+ *  IBM CONFIDENTIAL
+ *
+ *  COPYRIGHT International Business Machines Corp. 2010-2012
+ *
+ *  p1
+ *
+ *  Object Code Only (OCO) source materials
+ *  Licensed Internal Code Source Materials
+ *  IBM HostBoot Licensed Internal Code
+ *
+ *  The source code for this program is not published or other-
+ *  wise divested of its trade secrets, irrespective of what has
+ *  been deposited with the U.S. Copyright Office.
+ *
+ *  Origin: 30
+ *
+ *  IBM_PROLOG_END_TAG
+ */
 #include <assert.h>
 #include <kernel/cpumgr.H>
 #include <kernel/task.H>
@@ -174,7 +175,7 @@ void CpuManager::startSlaveCPU(cpu_t* cpu)
 void CpuManager::activateCPU(cpu_t * i_cpu)
 {
     i_cpu->active = true;
-    ++cv_cpuCount;
+    __sync_fetch_and_add(&cv_cpuCount, 1);
     lwsync();
 }