Re: [PATCH v4 03/36] arm64/gcs: Document the ABI for Guarded Control Stacks

On Wed, Aug 23, 2023 at 06:40:40PM +0100, Szabolcs Nagy wrote:

i don't know if we can allow disabled gcs thread creation with locked
gcs state. (i can see arguments both ways, so further prctl flag may
be needed which may be another divergence from x86)

I think that if we do add a new flag that'd just be new functionality,
the divergence would be in allowing configuration via clone3() rather
than the flag.  TBH I'm not sure I see a use case for locking but
providing a mechanism for getting out of the lock, that seems very
questionable.