From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Subject: Re: [RFC 2/2] perf/core: change errno for sampling event not
 supported in hardware
Date: Thu, 12 May 2016 12:24:25 +0530
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To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-perf-users@vger.kernel.org, Vince Weaver <vincent.weaver@maine.edu>, linux-kernel@vger.kernel.org, acme@redhat.com, linux-snps-arc@lists.infradead.org, mingo@kernel.org

On Thursday 12 May 2016 12:12 PM, Peter Zijlstra wrote:
>> Tried that and doesn't even compile. Reconfirms what Vince said, ENOTSUPP is not
>> > exposed to userspace (being in include/linux and not include/uapi/linux)
> Durr, so what does userspace see?

It sees the "value" of ENOTSUPP, i.e. 524 but there is no symbolic reference to it :-)