ARC: [clockevent] simplify timer ISR

* Remove one liner IRQ ACK accessor, it was coming in the way of readability.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

diff --git a/arch/arc/kernel/time.c b/arch/arc/kernel/time.c
index a8787bc..71c4252 100644 (file)
--- a/arch/arc/kernel/time.c
+++ b/arch/arc/kernel/time.c
@@ -155,22 +155,6 @@ static void arc_timer_event_setup(unsigned int limit)
        write_aux_reg(ARC_REG_TIMER0_CTRL, TIMER_CTRL_IE | TIMER_CTRL_NH);
 }
 
-/*
- * Acknowledge the interrupt (oneshot) and optionally re-arm it (periodic)
- * -Any write to CTRL Reg will ack the intr (NH bit: Count when not halted)
- * -Rearming is done by setting the IE bit
- *
- * Small optimisation: Normal code would have been
- *   if (irq_reenable)
- *     CTRL_REG = (IE | NH);
- *   else
- *     CTRL_REG = NH;
- * However since IE is BIT0 we can fold the branch
- */
-static void arc_timer_event_ack(unsigned int irq_reenable)
-{
-       write_aux_reg(ARC_REG_TIMER0_CTRL, irq_reenable | TIMER_CTRL_NH);
-}
 
 static int arc_clkevent_set_next_event(unsigned long delta,
                                       struct clock_event_device *dev)
@@ -207,10 +191,22 @@ static DEFINE_PER_CPU(struct clock_event_device, arc_clockevent_device) = {
 
 static irqreturn_t timer_irq_handler(int irq, void *dev_id)
 {
-       struct clock_event_device *clk = this_cpu_ptr(&arc_clockevent_device);
+       /*
+        * Note that generic IRQ core could have passed @evt for @dev_id if
+        * irq_set_chip_and_handler() asked for handle_percpu_devid_irq()
+        */
+       struct clock_event_device *evt = this_cpu_ptr(&arc_clockevent_device);
+       int irq_reenable = evt->mode == CLOCK_EVT_MODE_PERIODIC;
+
+       /*
+        * Any write to CTRL reg ACks the interrupt, we rewrite the
+        * Count when [N]ot [H]alted bit.
+        * And re-arm it if perioid by [I]nterrupt [E]nable bit
+        */
+       write_aux_reg(ARC_REG_TIMER0_CTRL, irq_reenable | TIMER_CTRL_NH);
+
+       evt->event_handler(evt);
 
-       arc_timer_event_ack(clk->mode == CLOCK_EVT_MODE_PERIODIC);
-       clk->event_handler(clk);
        return IRQ_HANDLED;
 }