[PATCH v2 2/4] arm64/signal: Include TPIDR2 in the signal context

[Will Deacon]

On Tue, Nov 15, 2022 at 12:08:44PM +0000, Mark Brown wrote:
> On Mon, Nov 14, 2022 at 04:10:06PM +0000, Will Deacon wrote:
> > On Mon, Oct 31, 2022 at 08:17:34PM +0000, Mark Brown wrote:
> 
> > > +			if (user->tpidr2)
> > > +				goto invalid;
> 
> > > +			if (size != sizeof(*user->tpidr2))
> 
> > Why are you requiring an exact match here? Won't that hinder any future
> > extension of the structure?
> 
> It will but since the structure is explicitly for a single sysreg
> that's intentional - the thinking was to just continue to model
> any more sysregs we want to report in the signal context in the
> same format with their own contexts.  It felt like it fit better
> into how everything else in the signal context is extended.

I see, but having the usual '<' check wouldn't preclude us from doing
what you suggest above, whilst also giving us some flexibility in case
things turn out differently from how we expected.

Will