doc: dev-tools: kselftest.rst: update contributing new tests
Add a description that the kernel headers should be used as far as it is
possible and then the system headers.
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Reviewed-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/dev-tools/kselftest.rst b/Documentation/dev-tools/kselftest.rst
index e80850e..3bf371a 100644
--- a/Documentation/dev-tools/kselftest.rst
+++ b/Documentation/dev-tools/kselftest.rst
@@ -151,6 +151,11 @@
TEST_FILES, TEST_GEN_FILES mean it is the file which is used by
test.
+ * First use the headers inside the kernel source and/or git repo, and then the
+ system headers. Headers for the kernel release as opposed to headers
+ installed by the distro on the system should be the primary focus to be able
+ to find regressions.
+
Test Harness
============
