[PATCH] arm64: signal: Update sigcontext reservations table

[Mark Brown]

On Wed, Sep 04, 2024 at 12:24:24PM +0100, Dave Martin wrote:
> On Tue, Sep 03, 2024 at 07:26:04PM +0100, Mark Brown wrote:

> > It be good to add a selftest that flags this, that way people might
> > notice when adding things and if we miss something it'll probably turn
> > up in one of the CIs at some point (possibly after it's too late but at
> > least we'd know).  That'd give us some level of integration test with
> > whatever libcs and other default software are actually doing, as opposed
> > to what we think they'll do.

> I suppose we could write a test that sets VL=64, SVL=32 and dirties the
> SVE and SME regs before triggering a signal, then checks that
> extra_context is not there.  This will only work if SVE and SME are
> present and big enough.  If we can run this as a routine CI test on a
> model, it might be useful though.

I'd also run this test with the default settings for the system, it
might help people notice if they've configured their system in some
way that causes issues unexpectedly.
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