[PATCH v1 15/20] arm64: add POE signal support

[Mark Brown]

On Wed, Sep 27, 2023 at 03:01:18PM +0100, Joey Gouly wrote:
> Add PKEY support to signals, by saving and restoring POR_EL0 from the stackframe.

It'd be nice to have at least a basic test that validates that we
generate a POE signal frame when expected, though that should be a very
minor thing which is unlikely to ever actually spot anything.

I'd also expect to see matching support added to ptrace.
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