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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH v3 net-next 2/5] net: tracepoint: replace tcp_set_state
 tracepoint with inet_sock_set_state tracepoint
Date: Tue, 02 Jan 2018 14:52:08 -0500 (EST)
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From: Brendan Gregg <brendan.d.gregg@gmail.com>
Date: Tue, 2 Jan 2018 11:46:26 -0800

> If I'm to use sock:inet_sock_set_state for TCP tracing, I'd like
> sk->sk_protocol exposed as a tracepoint argument so I can match on
> IPPROTO_TCP.

Agreed.