From mboxrd@z Thu Jan  1 00:00:00 1970
From: peterz@infradead.org (Peter Zijlstra)
Date: Wed, 11 May 2016 21:36:27 +0200
Subject: [RFC 2/2] perf/core: change errno for sampling event not
 supported in hardware
In-Reply-To: <5730C79F.3060307@synopsys.com>
References: <1462786660-2900-1-git-send-email-vgupta@synopsys.com>
 <1462786660-2900-3-git-send-email-vgupta@synopsys.com>
 <alpine.DEB.2.20.1605090923460.27332@macbook-air>
 <5730C79F.3060307@synopsys.com>
List-ID: <linux-snps-arc@lists.infradead.org>
Message-ID: <20160511193627.GH3190@twins.programming.kicks-ass.net>
To: linux-snps-arc@lists.infradead.org

On Mon, May 09, 2016@10:53:43PM +0530, Vineet Gupta wrote:

> Right thats what I feared. But hold on, I don't think we need to change the ABI to
> achieve what we want. Gosh why did I even take that path.
> 
> Currently the errno switch case in perf_evsel__open_strerror() in doesn't handle
> ENOTSUPP. So how about we add that - augmented with the same sample_period !0
> check to barf for lack of sampling support.
> 
> Do you see anything wrong with that ?

Should work I think.