linux-kernel - Re: [PATCH net-next 2/3] bpf: introduce bpf_perf_event

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Message-ID: <20151023164223.GE17308@twins.programming.kicks-ass.net>
Date:	Fri, 23 Oct 2015 18:42:23 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>, Wang Nan <wangnan0@...wei.com>,
	He Kuang <hekuang@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 2/3] bpf: introduce bpf_perf_event_output()
 helper

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.
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