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

[Mark Brown]

On Thu, Oct 05, 2023 at 03:34:29PM +0100, Mark Brown wrote:
> 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.

Actually, now I think about it we at least need an update to the frame
parser in userspace so it knows about the new frame.  Without that it'll
warn whenver it parses the signal context on any system that has POE
enabled.
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