[PATCH v5 19/30] arm64: add POE signal support

[Mark Brown]

On Tue, Oct 15, 2024 at 10:59:11AM +0100, Joey Gouly wrote:
> On Mon, Oct 14, 2024 at 06:10:23PM +0100, Will Deacon wrote:

> > Looking a little more at this, I think we have quite a weird behaviour
> > on arm64 as it stands. It looks like we rely on the signal frame to hold
> > the original POR_EL0 so, if for some reason we fail to allocate space
> > for the POR context, I think we'll return back from the signal with
> > POR_EL0_INIT. That seems bad?

> If we don't allocate space for POR_EL0, I think the program recieves SIGSGEV?

...

> So I think it's "fine"?

Yeah, there's a bunch of other stuff would go badly if we tried to carry
on after failing to allocate a signal frame.
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