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[POWERPC] Timer interrupt: use a struct for two per_cpu varables
timer_interrupt() was calculating per_cpu_offset several times, having to start from the toc because of potential aliasing issues. Placing both decrementer per_cpu varables in a struct and calculating the address once with __get_cpu_var results in better code on both 32 and 64 bit. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
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8b5621f183
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1 changed files with 12 additions and 8 deletions
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@ -116,8 +116,12 @@ static struct clock_event_device decrementer_clockevent = {
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.features = CLOCK_EVT_FEAT_ONESHOT,
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.features = CLOCK_EVT_FEAT_ONESHOT,
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};
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};
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static DEFINE_PER_CPU(struct clock_event_device, decrementers);
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struct decrementer_clock {
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static DEFINE_PER_CPU(u64, decrementer_next_tb);
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struct clock_event_device event;
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u64 next_tb;
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};
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static DEFINE_PER_CPU(struct decrementer_clock, decrementers);
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#ifdef CONFIG_PPC_ISERIES
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#ifdef CONFIG_PPC_ISERIES
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static unsigned long __initdata iSeries_recal_titan;
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static unsigned long __initdata iSeries_recal_titan;
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@ -555,8 +559,8 @@ void __init iSeries_time_init_early(void)
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void timer_interrupt(struct pt_regs * regs)
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void timer_interrupt(struct pt_regs * regs)
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{
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{
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struct pt_regs *old_regs;
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struct pt_regs *old_regs;
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int cpu = smp_processor_id();
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struct decrementer_clock *decrementer = &__get_cpu_var(decrementers);
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struct clock_event_device *evt = &per_cpu(decrementers, cpu);
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struct clock_event_device *evt = &decrementer->event;
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u64 now;
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u64 now;
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/* Ensure a positive value is written to the decrementer, or else
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/* Ensure a positive value is written to the decrementer, or else
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@ -569,9 +573,9 @@ void timer_interrupt(struct pt_regs * regs)
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#endif
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#endif
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now = get_tb_or_rtc();
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now = get_tb_or_rtc();
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if (now < per_cpu(decrementer_next_tb, cpu)) {
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if (now < decrementer->next_tb) {
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/* not time for this event yet */
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/* not time for this event yet */
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now = per_cpu(decrementer_next_tb, cpu) - now;
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now = decrementer->next_tb - now;
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if (now <= DECREMENTER_MAX)
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if (now <= DECREMENTER_MAX)
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set_dec((int)now);
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set_dec((int)now);
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return;
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return;
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@ -810,7 +814,7 @@ void __init clocksource_init(void)
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static int decrementer_set_next_event(unsigned long evt,
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static int decrementer_set_next_event(unsigned long evt,
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struct clock_event_device *dev)
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struct clock_event_device *dev)
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{
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{
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__get_cpu_var(decrementer_next_tb) = get_tb_or_rtc() + evt;
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__get_cpu_var(decrementers).next_tb = get_tb_or_rtc() + evt;
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set_dec(evt);
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set_dec(evt);
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return 0;
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return 0;
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}
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}
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@ -824,7 +828,7 @@ static void decrementer_set_mode(enum clock_event_mode mode,
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static void register_decrementer_clockevent(int cpu)
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static void register_decrementer_clockevent(int cpu)
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{
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{
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struct clock_event_device *dec = &per_cpu(decrementers, cpu);
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struct clock_event_device *dec = &per_cpu(decrementers, cpu).event;
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*dec = decrementer_clockevent;
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*dec = decrementer_clockevent;
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dec->cpumask = cpumask_of_cpu(cpu);
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dec->cpumask = cpumask_of_cpu(cpu);
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