Certification. Many commercial RTOS's are already certified to ASIL-C or ASIL-D, which requires extensive testing to verify that the system will work as designed and every code path is covered by tests. Products exist like Automotive Grade Linux, but you will have to go through the verification and certification process yourself which isn't quick or cheap. I'm not even sure it's possible to certify Linux to ASIL-D.

So yes, I'm sure that Linux can work. But it will be difficult to prove to auditors that it will always work.

I'm speculating that he does know. But with all the filters you added (right hardware, right patches etc.) you would be better off to add the right patch -Linux/+<real_realtimekernel>

Besides, if you follow Linux kernel development, you see that the effort is virtually never for real-time but for general purpose.

Any RTOS has the very same hardware restrictions, and often only works on a very small number of (certified/supported) platforms.

There is no reason per se to attribute any downsides onto these "filters".

>Did you know that Linux can handle hard RT, if you use the right hardware (and maybe the right kernel/patches).?

Does TFA (which sure, is for Tesla, but same leadership) describe an environment where people use "the right hardware"?