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

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Subject: [RFC 2/2] perf/core: change errno for sampling event not supported in hardware
From: Vineet.Gupta1@xxxxxxxxxxxx (Vineet Gupta)
Date: Thu, 12 May 2016 12:24:25 +0530
In-reply-to: <20160512064201.GL3192@twins.programming.kicks-ass.net>
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> <20160511193627.GH3190@twins.programming.kicks-ass.net> <5734229B.90706@synopsys.com> <20160512064201.GL3192@twins.programming.kicks-ass.net>

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 :-)

Follow-Ups:
- [RFC 2/2] perf/core: change errno for sampling event not supported in hardware
  - From: Peter Zijlstra

References:
- [RFC 0/2] report perf sampling failing due to PMU lacking overflow intr support
  - From: Vineet Gupta
- [RFC 2/2] perf/core: change errno for sampling event not supported in hardware
  - From: Vineet Gupta
- [RFC 2/2] perf/core: change errno for sampling event not supported in hardware
  - From: Vince Weaver
- [RFC 2/2] perf/core: change errno for sampling event not supported in hardware
  - From: Vineet Gupta
- [RFC 2/2] perf/core: change errno for sampling event not supported in hardware
  - From: Peter Zijlstra
- [RFC 2/2] perf/core: change errno for sampling event not supported in hardware
  - From: Vineet Gupta
- [RFC 2/2] perf/core: change errno for sampling event not supported in hardware
  - From: Peter Zijlstra

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