Re: [tip: timers/urgent] timekeeping: Use READ/WRITE_ONCE() for tick_do_timer_cpu

[Thomas Gleixner]

On Wed, Apr 10 2024 at 10:15, Ingo Molnar wrote:
>> @@ -232,7 +233,7 @@ static void tick_setup_device(struct tick_device *td,
>>  						!tick_nohz_full_cpu(cpu)) {
>>  			tick_take_do_timer_from_boot();
>>  			tick_do_timer_boot_cpu = -1;
>> -			WARN_ON(tick_do_timer_cpu != cpu);
>> +			WARN_ON(READ_ON_ONCE(tick_do_timer_cpu) != cpu);
>
> So there's no such thing as READ_ON_ONCE() - I've amended the commit with 
> the fix below.

Can you hand me a brown paper bag please?