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authorAndi Kleen <ak@suse.de>2006-02-26 04:18:49 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-26 18:53:31 +0100
commite8b917775b572bc27de105f1317c2de4335db5b3 (patch)
tree940351af2d1690331d82a65331acf34254621936 /arch
parent[PATCH] x86_64: Fix the additional_cpus=.. option (diff)
downloadlinux-e8b917775b572bc27de105f1317c2de4335db5b3.tar.xz
linux-e8b917775b572bc27de105f1317c2de4335db5b3.zip
[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>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86_64/kernel/smpboot.c2
-rw-r--r--arch/x86_64/kernel/time.c22
2 files changed, 11 insertions, 13 deletions
diff --git a/arch/x86_64/kernel/smpboot.c b/arch/x86_64/kernel/smpboot.c
index b82eb86e4f5d..66e98659d077 100644
--- 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 67841d11ed1f..3080f84bf7b7 100644
--- 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);