On Thu, Jul 20, 2023 at 11:52:36AM +0100, Will Deacon wrote: > On Thu, Jul 13, 2023 at 09:06:04PM +0100, Mark Brown wrote: > > Since the ABI does not specify that changing the SVE vector length disturbs > > SME state, and since SVE code may not be aware of SME code in the process, > > we shouldn't simply discard any ZA state. Instead immediately reallocate > > the storage for SVE if SME is active, and disable SME if we change the SVE > > vector length while there is no SME state active. > What is the advantage of keep the old behaviour in this case? In other > words, if it's acceptable to reallocate the state when SME is active, why > not just reallocate in all cases? It was minimising the changes to the status quo given how attached people often are to these things.
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