Re: [PATCH v2 10/10] clocksource: import ARC timer driver

Daniel Lezcano
2016-11-03T22:38:15Z

On Thu, Nov 03, 2016 at 02:31:41PM -0700, Vineet Gupta wrote:
> This adds support for
>
> - CONFIG_ARC_TIMERS : legacy 32-bit TIMER0 and TIMER1 which count UP
> from @CNT to @LIMIT, before optionally triggering an interrupt.
> These are programmed using ARC auxiliary register interface.
> These are present in all ARC cores (ARC700 and ARC HS38)
> TIMER0 serves as clockevent for all ARC linux builds.
> TIMER1 is used for clocksource in arc700 builds.
>
> - CONFIG_ARC_TIMERS_64BIT: 64-bit counters, RTC and GFRC found in
> ARC HS38 cores. These are independnet IP blocks with different
> programming model respectively.
>
> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
> ---

[ ... ]

> #include <linux/of_irq.h>
> -#include <asm/irq.h>
>
> #include <soc/arc/timers.h>
> #include <soc/arc/mcip.h>
> @@ -263,7 +248,7 @@ static irqreturn_t timer_irq_handler(int irq, void *dev_id)
> * 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 = clockevent_state_periodic(evt);
> + int irq_reenable __maybe_unused = clockevent_state_periodic(evt);

Why is needed __maybe_unused ? I see in the previous driver 'irq_reenable' is
used or is there a change in the previous patches I missed ?