[RFC 2/2] perf/core: change errno for sampling event not supported in hardware

[Vince Weaver]

On Thu, 12 May 2016, Peter Zijlstra wrote:

> Ah.. which might be a hint that nobody is actually explicitly testing
> for this and we might just get away with changing the ABI.
> 
> Vince, what say you; shall we try and get away with it? ;-)

It's probably worth trying.

The only other time anyone else noticed was in this thread
	https://lkml.org/lkml/2015/6/11/136
and I think the conclusion at the end of that was also that it's probably 
worth changing.

Vince