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

[Mark Brown]

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.
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