linux-kernel - [PATCH v2 bpf-next 0/2] Allow attaching to bare tracepoints

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Message-Id: <20210116182133.2286884-1-qais.yousef@arm.com>
Date:   Sat, 16 Jan 2021 18:21:31 +0000
From:   Qais Yousef <qais.yousef@....com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Yonghong Song <yhs@...com>,
        Steven Rostedt <rostedt@...dmis.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, Qais Yousef <qais.yousef@....com>
Subject: [PATCH v2 bpf-next 0/2] Allow attaching to bare tracepoints

Changes in v2:
	* Fix compilation error.
	* Make the new test use write() instead of read()

Add some missing glue logic to teach bpf about bare tracepoints - tracepoints
without any trace event associated with them.

Bare tracepoints are declare with DECLARE_TRACE(). Full tracepoints are declare
with TRACE_EVENT().

BPF can attach to these tracepoints as RAW_TRACEPOINT() only as there're no
events in tracefs created with them.

Qais Yousef (2):
  trace: bpf: Allow bpf to attach to bare tracepoints
  selftests: bpf: Add a new test for bare tracepoints

 Documentation/bpf/bpf_design_QA.rst           |  6 +++++
 include/trace/bpf_probe.h                     | 12 +++++++--
 .../bpf/bpf_testmod/bpf_testmod-events.h      |  6 +++++
 .../selftests/bpf/bpf_testmod/bpf_testmod.c   | 21 ++++++++++++++-
 .../selftests/bpf/bpf_testmod/bpf_testmod.h   |  6 +++++
 .../selftests/bpf/prog_tests/module_attach.c  | 27 +++++++++++++++++++
 .../selftests/bpf/progs/test_module_attach.c  | 10 +++++++
 7 files changed, 85 insertions(+), 3 deletions(-)

-- 
2.25.1