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Date: Fri, 23 Oct 2015 18:42:23 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Alexei Starovoitov <ast@plumgrid.com>
Cc: "David S. Miller" <davem@davemloft.net>, Ingo Molnar <mingo@kernel.org>,
        Wang Nan <wangnan0@huawei.com>, He Kuang <hekuang@huawei.com>,
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        Daniel Borkmann <daniel@iogearbox.net>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next 2/3] bpf: introduce bpf_perf_event_output()
 helper
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On Fri, Oct 23, 2015 at 08:02:00AM -0700, Alexei Starovoitov wrote:
> On 10/23/15 7:39 AM, Peter Zijlstra wrote:
> >On Tue, Oct 20, 2015 at 08:02:34PM -0700, Alexei Starovoitov wrote:
> >>>+static const struct bpf_func_proto bpf_perf_event_output_proto = {
> >>>+	.func		= bpf_perf_event_output,
> >>>+	.gpl_only	= false,
> >Oh ?
> 
> no particular reason. key helper bpf_probe_read() is gpl, so all
> bpf for tracing progs have to be gpl.
> If you feel strongly about it, I can change it.

All the perf symbols are export GPL, so I suppose this should be true.