[PATCH v7 18/23] aarch64: Handle GCS marking

[Yury Khrustalev]

On Wed, Jan 08, 2025 at 11:08:07AM -0300, Adhemerval Zanella Netto wrote:
> 
> >> This requires to update the glibc.cpu.aarch64_gcs_policy entry at 
> >> manual/tunables.texi with the description of what each value represents.
> > 
> > Right now GCS tunable names are reserved in the manual. When corresponding
> > Linux kernel functionality has been released, there will be another patch
> > for Glibc that will add the description of both GCS tunables. At this point
> > these tunables will become "public". This will likely be after the upcoming
> > Glibc release.
> 
> Ok, but this code is already defining the logic of how aarch64_gcs_policy
> works and when a user glibc on a GCS enabled kernel the tunable will be
> enacted.  I still think we need to document the current semantic, the
> reserved rationale would make sense if the tunable was not enacted.

Carlos, can I ask for your opinion? I thought we discussed this and the decision
was to reserve tunable names for now and document them properly later after the
corresponding Linux kernel functionality has been released.

Thanks,
Yury