Re: [PATCH v4 7/7] selftests: prctl: introduce tests for disabling THPs except for madvise

[Mark Brown]

On Thu, Aug 14, 2025 at 02:59:13PM +0200, David Hildenbrand wrote:
> On 14.08.25 14:09, Mark Brown wrote:

> > Perhaps this is something that needs considering in the ABI, so
> > userspace can reasonably figure out if it failed to configure whatever
> > is being configured due to a missing feature (in which case it should
> > fall back to not using that feature somehow) or due to it messing
> > something else up?  We might be happy with the tests being version
> > specific but general userspace should be able to be a bit more robust.

> Yeah, the whole prctl() ship has sailed, unfortunately :(

Perhaps a second call or sysfs file or something that returns the
supported mask?  You'd still have a boostrapping issue with existing
versions but at least at any newer stuff would be helped.

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