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

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Message-ID: <alpine.DEB.2.20.1605121903470.18777@macbook-air>
Date:	Thu, 12 May 2016 19:04:58 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	linux-perf-users@...r.kernel.org,
	Vince Weaver <vincent.weaver@...ne.edu>,
	linux-kernel@...r.kernel.org, acme@...hat.com,
	linux-snps-arc@...ts.infradead.org, mingo@...nel.org
Subject: Re: [RFC 2/2] perf/core: change errno for sampling event not supported
 in hardware

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