Re: [GIT pull] timers/core for v7.2-rc1

[Thomas Gleixner]

On Mon, Jun 15 2026 at 15:35, Oleg Nesterov wrote:
>>  struct clocksource * __init __weak clocksource_default_clock(void)
>>  {
>> +	if (!cs_jiffies_registered) {
>> +		__clocksource_register(&clocksource_jiffies);
>> +		cs_jiffies_registered = true;
>> +	}
>>  	return &clocksource_jiffies;
>>  }
>
> It seems that this change is problematic...
>
> timekeeping_init() does
>
> 	guard(raw_spinlock_irqsave)(&tk_core.lock);
>
> 	clock = clocksource_default_clock();
>
> and __clocksource_register() -> __clocksource_register_scale() takes
> clocksource_mutex.

Dammit. I missed to enable lockdep. The sleep while atomic muck does not
catch it because it's early boot. Someone sent a patch already. I'll get
the fix to Linus ASAP.

Thanks,

        tglx