[PATCH] x86_64: Move the SMP time selection earlier

SMP time selection originally ran after all CPUs were brought up because
it needed to know the number of CPUs to decide if it needs an MP safe
timer or not.

This is not needed anymore because we know present CPUs early.

This fixes a couple of problems:
 - apicmaintimer didn't always work because it relied on state that was
   set up time_init_gtod too late.
 - The output for the used timer in early kernel log was misleading
   because time_init_gtod could actually change it later.  Now always
   print the final timer choice

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/x86_64/kernel/smpboot.c b/arch/x86_64/kernel/smpboot.c
index b82eb86e4f5de33b9963b17ddfb8a39be84f351d..66e98659d077ea9c6f9ab8ce3890aa7318113d63 100644 (file)
--- a/arch/x86_64/kernel/smpboot.c
+++ b/arch/x86_64/kernel/smpboot.c
@@ -1152,8 +1152,6 @@ void __init smp_cpus_done(unsigned int max_cpus)
        setup_ioapic_dest();
 #endif
 
-       time_init_gtod();
-
        check_nmi_watchdog();
 }
 

diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c
index 67841d11ed1ff978aada750c1445b93001e20d1e..3080f84bf7b76f8f68274d84c5af15d705afc625 100644 (file)
--- a/arch/x86_64/kernel/time.c
+++ b/arch/x86_64/kernel/time.c
@@ -48,6 +48,8 @@ static void cpufreq_delayed_get(void);
 extern void i8254_timer_resume(void);
 extern int using_apic_timer;
 
+static char *time_init_gtod(void);
+
 DEFINE_SPINLOCK(rtc_lock);
 DEFINE_SPINLOCK(i8253_lock);
 
@@ -901,6 +903,7 @@ static struct irqaction irq0 = {
 void __init time_init(void)
 {
        char *timename;
+       char *gtod;
 
 #ifdef HPET_HACK_ENABLE_DANGEROUS
         if (!vxtime.hpet_address) {
@@ -945,21 +948,19 @@ void __init time_init(void)
                timename = "PIT";
        }
 
-       printk(KERN_INFO "time.c: Using %ld.%06ld MHz %s timer.\n",
-              vxtime_hz / 1000000, vxtime_hz % 1000000, timename);
+       vxtime.mode = VXTIME_TSC;
+       gtod = time_init_gtod();
+
+       printk(KERN_INFO "time.c: Using %ld.%06ld MHz WALL %s GTOD %s timer.\n",
+              vxtime_hz / 1000000, vxtime_hz % 1000000, timename, gtod);
        printk(KERN_INFO "time.c: Detected %d.%03d MHz processor.\n",
                cpu_khz / 1000, cpu_khz % 1000);
-       vxtime.mode = VXTIME_TSC;
        vxtime.quot = (1000000L << 32) / vxtime_hz;
        vxtime.tsc_quot = (1000L << 32) / cpu_khz;
        vxtime.last_tsc = get_cycles_sync();
        setup_irq(0, &irq0);
 
        set_cyc2ns_scale(cpu_khz);
-
-#ifndef CONFIG_SMP
-       time_init_gtod();
-#endif
 }
 
 /*
@@ -981,9 +982,9 @@ __cpuinit int unsynchronized_tsc(void)
 }
 
 /*
- * Decide after all CPUs are booted what mode gettimeofday should use.
+ * Decide what mode gettimeofday should use.
  */
-void __init time_init_gtod(void)
+__init static char *time_init_gtod(void)
 {
        char *timetype;
 
@@ -1011,8 +1012,7 @@ void __init time_init_gtod(void)
                timetype = hpet_use_timer ? "HPET/TSC" : "PIT/TSC";
                vxtime.mode = VXTIME_TSC;
        }
-
-       printk(KERN_INFO "time.c: Using %s based timekeeping.\n", timetype);
+       return timetype;
 }
 
 __setup("report_lost_ticks", time_setup);

diff --git a/include/asm-x86_64/proto.h b/include/asm-x86_64/proto.h
index 8bdcbd0aa03f5845491e6692440bbed2ad36c50b..3ba8fd45fcb3cb7c637501e20bd2373c3df5cc50 100644 (file)
--- a/include/asm-x86_64/proto.h
+++ b/include/asm-x86_64/proto.h
@@ -39,7 +39,6 @@ extern void config_acpi_tables(void);
 extern void ia32_syscall(void);
 extern void iommu_hole_init(void);
 
-extern void time_init_gtod(void);
 extern int pmtimer_mark_offset(void);
 extern void pmtimer_resume(void);
 extern void pmtimer_wait(unsigned);