MIME-Version: 1.0
From: Alexei Starovoitov <ast@plumgrid.com>
Date: Sat, 14 Feb 2015 17:48:58 -0500
Message-ID: <CAMEtUuyLU5i4LW=ugTkOc4b2KLfo3cQhZe1pp+fLmq3qNfGQfg@mail.gmail.com>
Subject: Re: [PATCH v3 linux-trace 1/8] tracing: attach eBPF programs to
 tracepoints and syscalls
To: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>, Ingo Molnar <mingo@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        Jiri Olsa <jolsa@redhat.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Linux API <linux-api@vger.kernel.org>,
        Network Development <netdev@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        "Eric W. Biederman" <ebiederm@xmission.com>
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On Wed, Feb 11, 2015 at 5:28 AM, Peter Zijlstra <peterz@infradead.org> wrote:
>
> We're compiling the BPF stuff against the 'current' kernel headers
> right?

the tracex1 example is pulling kernel headers to demonstrate
how bpf_fetch*() helpers can be used to walk kernel structures
without debug info.
The other examples don't need any internal headers.

> So would enforcing module versioning not be sufficient?

I'm going to redo the ex1 to use kprobe and some form of
version check. Indeed module-like versioning should
be enough.
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