On Thu, 28 Sep 2017, Junaid Shahid wrote:
> Hi Peter,
>
> It looks like try_cmpxchg is not available on non-x86 archs, but other than
> that the version that you proposed looks good.
>
> One thing that I am a bit curious about is that the original code, before
> either patch, had a test_and_set_bit for KTHREAD_IS_PARKED rather than just
> a set_bit. I can't think of any reason why that was needed, since it
> doesn't look like TASK_PARKED tasks are susceptible to spurious wakeups. Do
> you by any chance happen to know if there was any specific reason for it?
Everything is susceptible to spurious wakeups and has to deal with it.
Thanks,
tglx
