[pas]

Thanks for this detailed and a bit overwhelmingly long list. When I saw the first Paul Turner techtalk on rseq (it was called something else - LPC - if I remember correctly), it seemed so simple, so obvious "just read this memory address and if there was an interruption, we have to retry".

But then of course real life is a lot more complex than slideware.

cpu_opv is new for me (no time for LWN these days), but looks simple, elegant and sort of obvious (again). Which makes me wonder why no one thought about it yet. (But of course this is probably my ignorance speaking.)

Thanks for pushing the limits!