[PATCH 0/2] perf bpf: Fix relocation error

[Wang Nan]

Alexei notices me about a bug in llvm [1]. Because of this bug,
even a normal BPF program can generate incorrect (or redundant)
relocation information.

Patch 1 adds a new test case about it (use an buggy BPF script, should
fail even LLVM's bug is fixed). Since it is the first test case expected
to be fail, test framework is slightly adjusted.

Patch 2 adds the checker.

[1] https://llvm.org/bugs/show_bug.cgi?id=26243

Wang Nan (2):
  perf test: Add libbpf relocation checker
  perf bpf: Check relocation target section

 tools/lib/bpf/libbpf.c                        | 34 +++++++++++-------
 tools/perf/Makefile.perf                      |  2 +-
 tools/perf/tests/.gitignore                   |  1 +
 tools/perf/tests/Build                        |  9 ++++-
 tools/perf/tests/bpf-script-test-relocation.c | 50 +++++++++++++++++++++++++++
 tools/perf/tests/bpf.c                        | 26 +++++++++++---
 tools/perf/tests/llvm.c                       | 17 ++++++---
 tools/perf/tests/llvm.h                       |  5 ++-
 8 files changed, 120 insertions(+), 24 deletions(-)
 create mode 100644 tools/perf/tests/bpf-script-test-relocation.c

Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Cc: Li Zefan <lizefan@xxxxxxxxxx>              
Cc: pi3orama@xxxxxxx
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1.8.3.4