netdev - [PATCH bpf 0/3] bpf: Make BPF trampoline friendly to ftrace

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Date:   Sun, 8 Dec 2019 16:01:11 -0800
From:   Alexei Starovoitov <ast@...nel.org>
To:     <davem@...emloft.net>
CC:     <daniel@...earbox.net>, <rostedt@...dmis.org>, <x86@...nel.org>,
        <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        <kernel-team@...com>
Subject: [PATCH bpf 0/3] bpf: Make BPF trampoline friendly to ftrace

Patch 1 - fix crash function_graph tracer encounters BPF trampoline
Patch 2 - use register_ftrace_direct() API to attach BPF trampoline
Patch 3 - simple test

Alexei Starovoitov (3):
  ftrace: Fix function_graph tracer interaction with BPF trampoline
  bpf: Make BPF trampoline use register_ftrace_direct() API
  selftests/bpf: test function_graph tracer and bpf trampoline together

 arch/x86/kernel/ftrace.c                   | 14 -----
 include/linux/bpf.h                        |  1 +
 include/linux/ftrace.h                     |  5 ++
 kernel/bpf/trampoline.c                    | 64 ++++++++++++++++++++--
 kernel/trace/fgraph.c                      |  9 +++
 kernel/trace/ftrace.c                      | 19 +++----
 tools/testing/selftests/bpf/test_ftrace.sh | 39 +++++++++++++
 7 files changed, 119 insertions(+), 32 deletions(-)
 create mode 100755 tools/testing/selftests/bpf/test_ftrace.sh

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2.23.0