[PATCH v12 06/40] arm64/sme: Provide ABI documentation for SME

[Szabolcs Nagy]

The 04/06/2022 19:50, Mark Brown wrote:
> 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?

i think that's ok too.