Re: [PATCH 16/20] objtool: Rewrite alt->skip_orig

[Josh Poimboeuf]

On Fri, Mar 08, 2019 at 10:34:18PM +0100, Peter Zijlstra wrote:
> On Fri, Mar 08, 2019 at 02:15:56PM -0600, Josh Poimboeuf wrote:
> > On Thu, Mar 07, 2019 at 12:45:27PM +0100, Peter Zijlstra wrote:
> > > Really skip the original instruction flow, instead of letting it
> > > continue with NOPs.
> > > 
> > > Since the alternative code flow already continues after the original
> > > instructions, only the alt-original is skipped.
> > 
> > I like this approach.  I wonder if we can do something similar to get
> > rid of the nasty fake jumps.
> 
> This actually hard relies on those fake jumps. Or am I missing the
> point?

I was just wondering out loud if we could somehow keep the same "fake
jump" functionality, but do it in a cleaner way that doesn't require
creating fake instructions.  I'll might give it a try.

-- 
Josh