Re: [PATCH] Documentation/x86: Fix PR_SET_SPECULATION_CTRL error codes

[Brendan Jackman]

On Thu Oct 30, 2025 at 1:59 PM UTC, Brendan Jackman wrote:
> -ENXIO   Control of the selected speculation misfeature is not possible.
> -        See PR_GET_SPECULATION_CTRL.
> +ENXIO   For PR_SPEC_STORE_BYPASS: control of the selected speculation misfeature
> +        is not possible via prctl, because of the system's boot configuration.
> +
> +EPERM   Speculation was disabled with PR_SPEC_FORCE_DISABLE and caller tried to
> +        enable it again.
> +
> +EPERM   For PR_SPEC_STORE_BYPASS and PR_SPEC_INDIRECT_BRANCH: control of the
Ugh,           ^^^^^^^^^^^^^^^^^^^^ that should be PR_SPEC_L1D_FLUSH

I will wait a day or two before v2 in case anyone else spots other
mistakes or has other comments.