1 files changed, 10 insertions, 18 deletions

diff --git a/arch/arc/kernel/time.c b/arch/arc/kernel/time.c
index 36c2aa99436f..dbe74f418019 100644
--- a/arch/arc/kernel/time.c
+++ b/arch/arc/kernel/time.c
@@ -144,12 +144,12 @@ static struct clocksource arc_counter = {
 /********** Clock Event Device *********/
 
 /*
- * Arm the timer to interrupt after @limit cycles
+ * Arm the timer to interrupt after @cycles
  * The distinction for oneshot/periodic is done in arc_event_timer_ack() below
  */
-static void arc_timer_event_setup(unsigned int limit)
+static void arc_timer_event_setup(unsigned int cycles)
 {
-        write_aux_reg(ARC_REG_TIMER0_LIMIT, limit);
+        write_aux_reg(ARC_REG_TIMER0_LIMIT, cycles);
         write_aux_reg(ARC_REG_TIMER0_CNT, 0);   /* start from 0 */
 
         write_aux_reg(ARC_REG_TIMER0_CTRL, TIMER_CTRL_IE | TIMER_CTRL_NH);
@@ -168,6 +168,10 @@ static void arc_clkevent_set_mode(enum clock_event_mode mode,
 {
         switch (mode) {
         case CLOCK_EVT_MODE_PERIODIC:
+                /*
+                 * At X Hz, 1 sec = 1000ms -> X cycles;
+                 *                    10ms -> X / 100 cycles
+                 */
                 arc_timer_event_setup(arc_get_core_freq() / HZ);
                 break;
         case CLOCK_EVT_MODE_ONESHOT:
@@ -210,12 +214,6 @@ static irqreturn_t timer_irq_handler(int irq, void *dev_id)
         return IRQ_HANDLED;
 }
 
-static struct irqaction arc_timer_irq = {
-        .name    = "Timer0 (clock-evt-dev)",
-        .flags   = IRQF_TIMER | IRQF_PERCPU,
-        .handler = timer_irq_handler,
-};
-
 /*
  * Setup the local event timer for @cpu
  */
@@ -228,15 +226,9 @@ void arc_local_timer_setup()
         clockevents_config_and_register(evt, arc_get_core_freq(),
                                         0, ARC_TIMER_MAX);
 
-        /*
-         * setup the per-cpu timer IRQ handler - for all cpus
-         * For non boot CPU explicitly unmask at intc
-         * setup_irq() -> .. -> irq_startup() already does this on boot-cpu
-         */
-        if (!cpu)
-                setup_irq(TIMER0_IRQ, &arc_timer_irq);
-        else
-                arch_unmask_irq(TIMER0_IRQ);
+        /* setup the per-cpu timer IRQ handler - for all cpus */
+        arc_request_percpu_irq(TIMER0_IRQ, cpu, timer_irq_handler,
+                               "Timer0 (per-cpu-tick)", evt);
 }
 
 /*