Re: [BUG][PATCH] arm64: bti: fix BTI to handle local indirect branches

[Mark Brown]

On Mon, Oct 05, 2020 at 03:10:42PM -0500, Jeremy Linton wrote:
> On 10/5/20 2:59 PM, Mark Brown wrote:

> > ...this is going to cause problems, SYM_CODE means that we should
> > assemble *exactly* what was written since it's some non-standard thing -
> > we use it for the vectors table for example.  Looking at the code it's
> > not 100% clear that the best approach here isn't just to change the call
> > to a regular function call, this isn't a fast path or anything as far as
> > I can see so it's unclear to me why we need to tail call.

> Well for some workloads its could be AFAIK. OTOH, Ard mentioned dumping the
> tail call too, and I think that is pretty reasonable. So it looks like that
> is a better plan since it also avoids all this SYM_ flailing.

Yeah, I think that's the easiest thing all round.

Attachment: signature.asc
Description: PGP signature