[PATCH] docs/bpf: Document BPF_STRICT_BUILD=0 to tolerate test build failures

[Ricardo B. Marlière]

When the kernel config does not fully match the BPF selftest config
fragment, some tests may fail to compile. BPF_STRICT_BUILD (defaulting to
1) makes any such failure fatal. Mention the option so that developers are
aware they can set it to 0 to skip broken tests and keep the build going,
which is particularly useful during bringup or when testing on constrained
(e.g. distribution) configurations.

Signed-off-by: Ricardo B. Marlière <rbm@xxxxxxxx>
---
 Documentation/bpf/bpf_devel_QA.rst | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/bpf/bpf_devel_QA.rst b/Documentation/bpf/bpf_devel_QA.rst
index 45bc5c5cd793..edf8107a7beb 100644
--- a/Documentation/bpf/bpf_devel_QA.rst
+++ b/Documentation/bpf/bpf_devel_QA.rst
@@ -479,7 +479,10 @@ for details.
 
 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.
+tools/testing/selftests/bpf as closely as possible. If not possible,
+however, you can set ``BPF_STRICT_BUILD=0`` when invoking ``make``
+to tolerate individual compilation failures and continue building
+the remaining tests rather than treating each failure as fatal.
 
 Finally to ensure support for latest BPF Type Format features -
 discussed in Documentation/bpf/btf.rst - pahole version 1.16

---
base-commit: 8cdeaa50eae8dad34885515f62559ee83e7e8dda
change-id: 20260706-b4-bpf_strict_build_docs-a8aa7fa46e2f

Best regards,
--  
Ricardo B. Marlière <rbm@xxxxxxxx>