x86, perf: Fix comments in Pentium-4 PMU definitions

Reported-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1268705556.3379.8.camel@minggr.sh.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/include/asm/perf_event_p4.h

@@ -319,6 +319,7 @@ static inline u32 p4_default_escr_conf(int cpu, int exclude_os, int exclude_usr)
 
 #define P4_BSQ_ACTIVE_ENTRIES		P4_EVENT_PACK(0x06, 0x07)
 	/*
+	 * NOTE: no ESCR name in docs, it's guessed
 	 * MSR_P4_BSU_ESCR1:	2, 3
 	 */
 
@@ -468,8 +469,8 @@ static inline u32 p4_default_escr_conf(int cpu, int exclude_os, int exclude_usr)
 
 #define P4_UOPS_RETIRED			P4_EVENT_PACK(0x01, 0x04)
 	/*
-	 * MSR_P4_CRU_ESCR2:	12, 13, 16
-	 * MSR_P4_CRU_ESCR3:	14, 15, 17
+	 * MSR_P4_CRU_ESCR0:	12, 13, 16
+	 * MSR_P4_CRU_ESCR1:	14, 15, 17
 	 */
 
 #define P4_UOP_TYPE			P4_EVENT_PACK(0x02, 0x02)