---

yaml
---
r: 17983
b: refs/heads/master
c: 737c5c3
h: refs/heads/master
i:
  17981: dcb6784
  17979: feb3532
  17975: 1367291
  17967: f8e8f2e
  17951: 79bf74f
  17919: 75e8ca1
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3c0217511313a46039137d2dab30fdb1c5a65e64
+refs/heads/master: 737c5c3bde5641af9c24e3a60366674af72a43ef

trunk/arch/x86_64/kernel/smpboot.c

@@ -335,7 +335,13 @@ static __cpuinit void sync_tsc(unsigned int master)
 
 static void __cpuinit tsc_sync_wait(void)
 {
-	if (notscsync || !cpu_has_tsc)
+	/*
+	 * When the CPU has synchronized TSCs assume the BIOS
+  	 * or the hardware already synced.  Otherwise we could
+	 * mess up a possible perfect synchronization with a
+	 * not-quite-perfect algorithm.
+	 */
+	if (notscsync || !cpu_has_tsc || !unsynchronized_tsc())
 		return;
 	sync_tsc(0);
 }

trunk/arch/x86_64/kernel/time.c

@@ -953,7 +953,7 @@ void __init time_init(void)
  * Make an educated guess if the TSC is trustworthy and synchronized
  * over all CPUs.
  */
-static __init int unsynchronized_tsc(void)
+__init int unsynchronized_tsc(void)
 {
 #ifdef CONFIG_SMP
 	if (oem_force_hpet_timer())
@@ -964,7 +964,7 @@ static __init int unsynchronized_tsc(void)
  		return 0;
 #endif
  	/* Assume multi socket systems are not synchronized */
- 	return num_online_cpus() > 1;
+ 	return num_present_cpus() > 1;
 }
 
 /*

trunk/include/asm-x86_64/proto.h

@@ -89,6 +89,8 @@ extern void check_efer(void);
 
 extern int unhandled_signal(struct task_struct *tsk, int sig);
 
+extern int unsynchronized_tsc(void);
+
 extern void select_idle_routine(const struct cpuinfo_x86 *c);
 
 extern void gart_parse_options(char *);