On Thu, Mar 31, 2022 at 04:05:38PM +0000, Szabolcs Nagy wrote: > i think it's slightly better to treat ZA like TPIDR2, > so only clear if CLONE_SETTLS is set. > otherwise in principle the child can return to the frame > where ZA was used and expect it to work (it's hard to > come up with a reason why would some code do that, but > this is valid in a single-threaded fork child). From an implementation point of view it's a bit clearer if we just always preserve PSTATE.ZA and ZA contents on clone() and clear them on exec. Do you see a problem with that?
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