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Date:   Fri, 22 May 2020 12:24:34 +0100
From:   Alan Maguire <>
        Alan Maguire <>
Subject: [PATCH] selftests/bpf: add general instructions for test execution

Getting a clean BPF selftests run involves ensuring latest trunk LLVM/clang
are used, pahole is recent (>=1.16) and config matches the specified
config file as closely as possible.  Add to bpf_devel_QA.rst and point
tools/testing/selftests/bpf/README.rst to it.

Signed-off-by: Alan Maguire <>
Acked-by: Andrii Nakryiko <>
 Documentation/bpf/bpf_devel_QA.rst     | 15 +++++++++++++++
 tools/testing/selftests/bpf/README.rst |  2 ++
 2 files changed, 17 insertions(+)

diff --git a/Documentation/bpf/bpf_devel_QA.rst b/Documentation/bpf/bpf_devel_QA.rst
index 38c15c6..0b3db91 100644
--- a/Documentation/bpf/bpf_devel_QA.rst
+++ b/Documentation/bpf/bpf_devel_QA.rst
@@ -437,6 +437,21 @@ needed::
 See the kernels selftest `Documentation/dev-tools/kselftest.rst`_
 document for further documentation.
+To maximize the number of tests passing, the .config of the kernel
+under test should match the config file fragment in
+tools/testing/selftests/bpf as closely as possible.
+Finally to ensure support for latest BPF Type Format features -
+discussed in `Documentation/bpf/btf.rst`_ - pahole version 1.16
+is required for kernels built with CONFIG_DEBUG_INFO_BTF=y.
+pahole is delivered in the dwarves package or can be built
+from source at
+Some distros have pahole version 1.16 packaged already, e.g.
+Fedora, Gentoo.
 Q: Which BPF kernel selftests version should I run my kernel against?
 A: If you run a kernel ``xyz``, then always run the BPF kernel selftests
diff --git a/tools/testing/selftests/bpf/README.rst b/tools/testing/selftests/bpf/README.rst
index 0f67f1b..e885d35 100644
--- a/tools/testing/selftests/bpf/README.rst
+++ b/tools/testing/selftests/bpf/README.rst
@@ -1,6 +1,8 @@
 BPF Selftest Notes
+General instructions on running selftests can be found in
 Additional information about selftest failures are
 documented here.

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