From 70e8dd797946363e35af3a1033fc8406c9d0ae1f Mon Sep 17 00:00:00 2001
From: NAKAMURA Gou <go.nakamura.yw@hitachi-solutions.com>
Date: Fri, 11 Mar 2016 18:40:35 +0900
Subject: [PATCH] remove initialization of TSC (refs #362)

---
 arch/x86/kernel/cpu.c | 6 ------
 kernel/ap.c           | 3 ---
 kernel/init.c         | 5 -----
 3 files changed, 14 deletions(-)

diff --git a/arch/x86/kernel/cpu.c b/arch/x86/kernel/cpu.c
index c6e66651..2339a235 100644
--- a/arch/x86/kernel/cpu.c
+++ b/arch/x86/kernel/cpu.c
@@ -1517,9 +1517,3 @@ ihk_mc_user_context_t *lookup_user_context(struct thread *thread)
 
 	return uctx;
 } /* lookup_user_context() */
-
-
-void zero_tsc(void)
-{
-	wrmsr(MSR_IA32_TIME_STAMP_COUNTER, 0);
-}
diff --git a/kernel/ap.c b/kernel/ap.c
index 39acf866..7a66ff62 100644
--- a/kernel/ap.c
+++ b/kernel/ap.c
@@ -28,7 +28,6 @@
 
 int num_processors = 1;
 static volatile int ap_stop = 1;
-extern void zero_tsc(void);
 
 static void ap_wait(void)
 {
@@ -37,8 +36,6 @@ static void ap_wait(void)
 		cpu_pause();
 	}
 
-	zero_tsc();
-
 	kmalloc_init();
 	sched_init();
 
diff --git a/kernel/init.c b/kernel/init.c
index bef72a76..5cd1da0d 100644
--- a/kernel/init.c
+++ b/kernel/init.c
@@ -315,7 +315,6 @@ static void populate_sysfs(void)
 
 int host_ikc_inited = 0;
 extern int num_processors;
-extern void zero_tsc(void);
 
 static void post_init(void)
 {
@@ -334,10 +333,6 @@ static void post_init(void)
 		ihk_mc_spinlock_init(&syscall_lock);
 	}
 
-	/* Zero TSC.
-	 * All AP cores are wait spinning for ap_start() and they will zero
-	 * their TSC immediatly. */
-	zero_tsc();
 	ap_start();
 
 	sysfs_init();