linux-kernel - Re: [PATCH] tracing: bpf: Hide bpf trace events when they are not used

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Date:   Thu, 12 Oct 2017 21:35:01 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] tracing: bpf: Hide bpf trace events when they are not
 used

On Thu, 12 Oct 2017 18:14:52 -0700
Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:

> On Thu, Oct 12, 2017 at 06:40:02PM -0400, Steven Rostedt wrote:
> > From: Steven Rostedt (VMware) <rostedt@...dmis.org>
> > 
> > All the trace events defined in include/trace/events/bpf.h are only
> > used when CONFIG_BPF_SYSCALL is defined. But this file gets included by
> > include/linux/bpf_trace.h which is included by the networking code with
> > CREATE_TRACE_POINTS defined.
> > 
> > If a trace event is created but not used it still has data structures
> > and functions created for its use, even though nothing is using them.
> > To not waste space, do not define the BPF trace events in bpf.h unless
> > CONFIG_BPF_SYSCALL is defined.
> > 
> > Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>  
> 
> Looks fine.
> Acked-by: Alexei Starovoitov <ast@...nel.org>
> 
> I'm assuming you want to take it through tracing tree along
> with all other cleanups?

Either way is fine. I have a few other ones. I believe Paul is taking
the RCU patch. There's no dependency.

I'll take it if it is easier for you. I just need the ack.

-- Steve