Re: [PATCH v2 1/5] PM: domains: Add GENPD_FLAG_RT_SAFE for PREEMPT_RT

[Krzysztof Kozlowski]

On 12/01/2023 11:36, Sebastian Andrzej Siewior wrote:
> On 2023-01-06 15:52:57 [+0100], Krzysztof Kozlowski wrote:
>>> Just so I don't get this wrong, since the cpuidle-psci also calls
>>> pm_runtime_* functions so it isn't PREEMPT_RT safe, at least not yet?
>>
>> You are correct. Patch 3 here addresses it by... just not doing runtime
>> PM. This is a hacky workaround but:
>> 1. I don't have any other idea,
>> 2. It's not a big problem because RT systems are not supposed to have
>> any CPU idle (one of first things during RT system tuning is to disable
>> cpuidle).
> 
> so you say you use idle=poll instead? 

This was generic comment that system is not supposed to go into deeper
idle states.

Best regards,
Krzysztof