[LTP] thermal: add new test group

[Kubaj, Piotr]

I set it to 300s, as requested, because attempts to set it to 60s and
120s gave some failures when running with -i 10.

2026-05-15 (金) の 16:42 +0200 に Petr Vorel さんは書きました:
> Hi all,
> 
> actually v20 is better than this v21 => setting it changes requested.
> I'd prefer to merge v20.
> 
> > Hi Piotr,
> 
> > On Thu, 14 May 2026 15:34:47 +0200, Piotr Kubaj wrote:
> > > thermal: add new test group
> 
> > > +	while (sleep_time > 0) {
> > > +		...
> > > +		if (temp > temp_high)
> > > +			break;
> > > +		sleep(sleep_time--);
> 
> > G2: sleep() used for synchronization. This is not a timer API test
> > so
> > the G2 exemption does not apply. Consider polling with
> > tst_timer_expired_ms() or discuss with maintainers if a thermal-
> > specific
> > exception is appropriate.
> 
> > > +			tst_res(TINFO, "Cooling down for %d
> > > seconds", COOLDOWN);
> > > +			sleep(COOLDOWN);
> 
> > G2: Same issue — sleep() used as a synchronization barrier for CPU
> > cooldown between zone tests. If a non-sleep alternative is
> > genuinely
> > infeasible for thermal testing, this needs explicit justification
> > in the
> > commit message.
> 
> Yes, cooldown could have been mentioned in the commit message, I'll
> add it for
> v20.
> 
> Kind regards,
> Petr
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