diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/kernel/time.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index d20947cf173..64b503c82a3 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -118,6 +118,7 @@ static struct clock_event_device decrementer_clockevent = { static DEFINE_PER_CPU(struct clock_event_device, decrementers); void init_decrementer_clockevent(void); +static DEFINE_PER_CPU(u64, decrementer_next_tb); #ifdef CONFIG_PPC_ISERIES static unsigned long __initdata iSeries_recal_titan; @@ -541,6 +542,7 @@ void timer_interrupt(struct pt_regs * regs) struct pt_regs *old_regs; int cpu = smp_processor_id(); struct clock_event_device *evt = &per_cpu(decrementers, cpu); + u64 now; /* Ensure a positive value is written to the decrementer, or else * some CPUs will continuue to take decrementer exceptions */ @@ -551,6 +553,14 @@ void timer_interrupt(struct pt_regs * regs) do_IRQ(regs); #endif + now = get_tb_or_rtc(); + if (now < per_cpu(decrementer_next_tb, cpu)) { + /* not time for this event yet */ + now = per_cpu(decrementer_next_tb, cpu) - now; + if (now <= DECREMENTER_MAX) + set_dec((unsigned int)now - 1); + return; + } old_regs = set_irq_regs(regs); irq_enter(); @@ -797,6 +807,10 @@ void __init clocksource_init(void) static int decrementer_set_next_event(unsigned long evt, struct clock_event_device *dev) { + __get_cpu_var(decrementer_next_tb) = get_tb_or_rtc() + evt; + /* The decrementer interrupts on the 0 -> -1 transition */ + if (evt) + --evt; set_dec(evt); return 0; } |