Re: [patch 3/3] tick: Annotate tick_do_timer_cpu data races

[Thomas Gleixner]

On Mon, Dec 07 2020 at 11:44, Paul E. McKenney wrote:
> On Mon, Dec 07, 2020 at 07:19:51PM +0100, Marco Elver wrote:
>> On Mon, 7 Dec 2020 at 18:46, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
>> I currently don't know what the rule for Peter's preferred variant
>> would be, without running the risk of some accidentally data_race()'d
>> accesses.
>> 
>> Thoughts?
>
> I am also concerned about inadvertently covering code with data_race().
>
> Also, in this particular case, why data_race() rather than READ_ONCE()?
> Do we really expect the compiler to be able to optimize this case
> significantly without READ_ONCE()?

That was your suggestion a week or so ago :)

Thanks,

        tglx