Re: [linus:master] BUILD REGRESSION a2e5790d841658485d642196dbb0927303d6c22f

[Peter Zijlstra]

On Thu, Feb 08, 2018 at 09:27:56AM -0800, Linus Torvalds wrote:
> On Thu, Feb 8, 2018 at 1:13 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> >
> > _The_ problem is that new binutils cannot sanely decode any function
> > that has a WARN in (this very much includes perf annotate):
> 
> Ugh.
> 
> Is there any reason why we don't just use UD2 and avoid this whole issue?

That's what I initially had, but then Arjan told me that a number of
emulators fatally terminate on UD2 since they assume it to be BUG. Which
is when we all went looking at UD1/UD0.

But yes, for our purposes UD2 is perfectly fine too, it will just mess
up the people doing bringup and the like.