1Linux Kernel Selftests
 2
 3The kernel contains a set of "self tests" under the tools/testing/selftests/
 4directory. These are intended to be small unit tests to exercise individual
 5code paths in the kernel.
 6
 7Running the selftests
 8=====================
 9
10To build the tests:
11
12  $ make -C tools/testing/selftests
13
14
15To run the tests:
16
17  $ make -C tools/testing/selftests run_tests
18
19- note that some tests will require root privileges.
20
21
22To run only tests targetted for a single subsystem:
23
24  $  make -C tools/testing/selftests TARGETS=cpu-hotplug run_tests
25
26See the top-level tools/testing/selftests/Makefile for the list of all possible
27targets.
28
29
30Contributing new tests
31======================
32
33In general, the rules for for selftests are
34
35 * Do as much as you can if you're not root;
36
37 * Don't take too long;
38
39 * Don't break the build on any architecture, and
40
41 * Don't cause the top-level "make run_tests" to fail if your feature is
42   unconfigured.