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

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Date:	Thu, 12 May 2016 12:24:25 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	<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 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 :-)