linux-kernel - Re: [PATCH] tcp: Export to userspace the TCP state names for the trace events

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Date:   Fri, 10 Nov 2017 10:07:00 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Song Liu <songliubraving@...com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tcp: Export to userspace the TCP state names for the
 trace events

On Fri, 10 Nov 2017 12:56:06 +0800
Yafang Shao <laoar.shao@...il.com> wrote:

> Could the macro tcp_state_name() be renamed ？
> If <trace/events/tcp.h> is included in include/net/tcp.h, it will

Ideally, you don't want to include trace/events/*.h headers in other
headers, as they can have side effects if those headers are included in
other trace/events/*.h headers.

> cause compile error, because there's another function tcp_state_name()
> defined in net/netfilter/ipvs/ip_vs_proto_tcp.c.
>     static const char * tcp_state_name(int state)
>     {
> 
>         if (state >= IP_VS_TCP_S_LAST)
> 
>             return "ERR!";
> 
>         return tcp_state_name_table[state] ? tcp_state_name_table[state] : "?";
> 
>     }

But that said, I didn't make up the trace_state_name(), it was already
there in net-next before this patch.

But yeah, in actuality, I would have just done:

#define EM(a)	{ a, #a },
#define EMe(a)	{ a, #a }

directly. Which we can still do.

-- Steve