diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 856b0b852192..47e563bfd4cf 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -1,10 +1,11 @@
 /*
  * Performance counter x86 architecture code
  *
- *  Copyright(C) 2008 Thomas Gleixner <tglx@linutronix.de>
- *  Copyright(C) 2008 Red Hat, Inc., Ingo Molnar
- *  Copyright(C) 2009 Jaswinder Singh Rajput
- *  Copyright(C) 2009 Advanced Micro Devices, Inc., Robert Richter
+ *  Copyright (C) 2008 Thomas Gleixner <tglx@linutronix.de>
+ *  Copyright (C) 2008-2009 Red Hat, Inc., Ingo Molnar
+ *  Copyright (C) 2009 Jaswinder Singh Rajput
+ *  Copyright (C) 2009 Advanced Micro Devices, Inc., Robert Richter
+ *  Copyright (C) 2008-2009 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
  *
  *  For licencing details see kernel-base/COPYING
  */
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 582108addefa..a95a171e608c 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1,9 +1,9 @@
 /*
  * Performance counter core code
  *
- *  Copyright(C) 2008 Thomas Gleixner <tglx@linutronix.de>
- *  Copyright(C) 2008 Red Hat, Inc., Ingo Molnar
- *
+ *  Copyright (C) 2008 Thomas Gleixner <tglx@linutronix.de>
+ *  Copyright (C) 2008-2009 Red Hat, Inc., Ingo Molnar
+ *  Copyright (C) 2008-2009 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
  *
  *  For licensing details see kernel-base/COPYING
  */