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SubjectRe: [PATCH 08/14] hrtimer: Allow hrtimer::function() to free the timer
On 06/08, Oleg Nesterov wrote:
> And I simply can not understand the complication in hrtimer_active(),
> please help!

Sorry for another off-topic email, but I don't even understand the
usage of hrtimer_active().

Say, do_nanosleep()

hrtimer_start_expires(&t->timer, mode);
if (!hrtimer_active(&t->timer))
t->task = NULL;

why? Assuming that hrtimer_active() is correct, it can only return
false if t->task was already cleared by hrtimer_wakeup().

OTOH. perf_cpu_hrtimer_restart() does

if (hrtimer_active(hr))

if (!hrtimer_callback_running(hr))

why it can't simply do

if (!hrtimer_active(hr)) // implies !hrtimer_callback_running()



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