On Fri, 31 Jan 2014 12:07:57 -0500
Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> diff --git a/kernel/timer.c b/kernel/timer.c
> index 106968f..426d114 100644
> --- a/kernel/timer.c
> +++ b/kernel/timer.c
> @@ -1461,18 +1461,20 @@ void run_local_timers(void)
> * the timer softirq.
> */
> #ifdef CONFIG_PREEMPT_RT_FULL
> + /* On RT, irq work runs from softirq */
> + if (irq_work_needs_cpu()) {
> + raise_softirq(TIMER_SOFTIRQ);
> + return;
> + }
> +
> if (!spin_do_trylock(&base->lock)) {
> raise_softirq(TIMER_SOFTIRQ);
> return;
> }
> #endif
Note, I debated about doing:
if (irq_work_needs_cpu() ||
!spin_do_trylock(&base->lock)) {
raise_softirq(TIMER_SOFTIRQ);
return;
}
instead, which is pretty much the same code. But I find it rather ugly,
and does not read as well. I haven't looked at the disassembly, but I
would hope that gcc would make my original version have the same result
as this one.
-- Steve
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