diff options
| author | David S. Miller <davem@sunset.davemloft.net> | 2007-02-22 06:24:10 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-26 01:54:11 -0700 |
| commit | 777a447529ad138f5fceb9c9ad28bab19848f277 (patch) | |
| tree | d6fa75027b26d0b2d436cb0f8dc97c72f411b970 /arch/sparc64/kernel/time.c | |
| parent | a58c9f3c1e929c3c323c26dbdafef46373a719d4 (diff) | |
[SPARC64]: Unify timer interrupt handler.
Things were scattered all over the place, split between
SMP and non-SMP.
Unify it all so that dyntick support is easier to add.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/kernel/time.c')
| -rw-r--r-- | arch/sparc64/kernel/time.c | 43 |
1 files changed, 18 insertions, 25 deletions
diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c index d457079118d..48e1217c1e4 100644 --- a/arch/sparc64/kernel/time.c +++ b/arch/sparc64/kernel/time.c @@ -31,6 +31,7 @@ #include <linux/profile.h> #include <linux/miscdevice.h> #include <linux/rtc.h> +#include <linux/kernel_stat.h> #include <asm/oplib.h> #include <asm/mostek.h> @@ -423,12 +424,6 @@ static struct sparc64_tick_ops hbtick_operations __read_mostly = { .softint_mask = 1UL << 0, }; -/* timer_interrupt() needs to keep up the real-time clock, - * as well as call the "do_timer()" routine every clocktick - * - * NOTE: On SUN5 systems the ticker interrupt comes in using 2 - * interrupts, one at level14 and one with softint bit 0. - */ unsigned long timer_tick_offset __read_mostly; static unsigned long timer_ticks_per_nsec_quotient __read_mostly; @@ -487,18 +482,27 @@ void notify_arch_cmos_timer(void) mod_timer(&sync_cmos_timer, jiffies + 1); } -irqreturn_t timer_interrupt(int irq, void *dev_id) +void timer_interrupt(int irq, struct pt_regs *regs) { + struct pt_regs *old_regs = set_irq_regs(regs); unsigned long ticks, compare, pstate; + unsigned long tick_mask = tick_ops->softint_mask; + + clear_softint(tick_mask); + + irq_enter(); - write_seqlock(&xtime_lock); + kstat_this_cpu.irqs[0]++; do { -#ifndef CONFIG_SMP profile_tick(CPU_PROFILING); update_process_times(user_mode(get_irq_regs())); -#endif - do_timer(1); + + if (smp_processor_id() == boot_cpu_id) { + write_seqlock(&xtime_lock); + do_timer(1); + write_sequnlock(&xtime_lock); + } /* Guarantee that the following sequences execute * uninterrupted. @@ -515,24 +519,13 @@ irqreturn_t timer_interrupt(int irq, void *dev_id) __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : /* no outputs */ : "r" (pstate)); - } while (time_after_eq(ticks, compare)); + } while (unlikely(time_after_eq(ticks, compare))); - write_sequnlock(&xtime_lock); + irq_exit(); - return IRQ_HANDLED; + set_irq_regs(old_regs); } -#ifdef CONFIG_SMP -void timer_tick_interrupt(struct pt_regs *regs) -{ - write_seqlock(&xtime_lock); - - do_timer(1); - - write_sequnlock(&xtime_lock); -} -#endif - /* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */ static void __init kick_start_clock(void) { |