[PATCH v4 18/29] arm64: add POE signal support

[Mark Brown]

On Thu, Jul 25, 2024 at 04:58:27PM +0100, Dave Martin wrote:

> I'll post a draft patch separately, since I think the update could
> benefit from separate discussion, but my back-of-the-envelope
> calculation suggests that (before this patch) we are down to 0x90
> bytes of free space (i.e., over 96% full).

> I wonder whether it is time to start pushing back on adding a new
> _foo_context for every individual register, though?

> Maybe we could add some kind of _misc_context for miscellaneous 64-bit
> regs.

That'd have to be a variably sized structure with pairs of sysreg
ID/value items in it I think which would be a bit of a pain to implement
but doable.  The per-record header is 64 bits, we'd get maximal saving
by allocating a byte for the IDs.

It would be very unfortunate timing to start gating things on such a
change though (I'm particularly worried about GCS here, at this point
the kernel changes are blocking the entire ecosystem).
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