Re: [PATCH 0/2] arm64: gcs: Return -EPERM when changes are prevented by locking

[Mark Brown <broonie@kernel.org>]

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On Thu, Sep 24, 2026 at 03:49:14PM -0500, Bill Roberts wrote:
> On 10/6/26 10:15 AM, Mark Brown wrote:

> > I was intending to do something soon to pull more of this code out into
> > some shared place since especially for RISC-V and arm64 where they're
> > using the prctl() rather than arch_prctl() interface so there's less
> > reason for things to be duplicated.

> Bear in mind that I do have patches out there, for x86 that enable prctl
> for them as well. I looked into doing the lock check in the prctl call path
> before
> it gets dispatched to the arch specific backend, it does require a common
> interface
> into the threads feature bits that each arch would need to, trivially,
> implement.

Yeah, it'd be great if that could land and we could hopefully eventually
end up with a shared interface for userspace.  We'd still need some arch
hooks no matter what, but the userspace experience would be much more
pleasant.

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