[v1,0/7] kunit: create a centralized executor to dispatch all KUnit tests

Message

Brendan Higgins Jan. 28, 2020, 7:19 a.m. UTC

## TL;DR

This patchset adds a centralized executor to dispatch tests rather than
relying on late_initcall to schedule each test suite separately along
with a couple of new features that depend on it.

## What am I trying to do?

Conceptually, I am trying to provide a mechanism by which test suites
can be grouped together so that they can be reasoned about collectively.
The last two of three patches in this series add features which depend
on this:

PATCH 5/7 Prints out a test plan right before KUnit tests are run[1];
          this is valuable because it makes it possible for a test
          harness to detect whether the number of tests run matches the
          number of tests expected to be run, ensuring that no tests
          silently failed.

PATCH 6/7 Add a new kernel command-line option which allows the user to
          specify that the kernel poweroff, halt, or reboot after
          completing all KUnit tests; this is very handy for running
          KUnit tests on UML or a VM so that the UML/VM process exits
          cleanly immediately after running all tests without needing a
          special initramfs.

In addition, by dispatching tests from a single location, we can
guarantee that all KUnit tests run after late_init is complete, which
was a concern during the initial KUnit patchset review (this has not
been a problem in practice, but resolving with certainty is nevertheless
desirable).

Other use cases for this exist, but the above features should provide an
idea of the value that this could provide.

Alan Maguire (1):
  kunit: test: create a single centralized executor for all tests

Brendan Higgins (5):
  vmlinux.lds.h: add linker section for KUnit test suites
  arch: um: add linker section for KUnit test suites
  init: main: add KUnit to kernel init
  kunit: test: add test plan to KUnit TAP format
  Documentation: Add kunit_shutdown to kernel-parameters.txt

David Gow (1):
  kunit: Add 'kunit_shutdown' option

 .../admin-guide/kernel-parameters.txt         |  7 ++
 arch/um/include/asm/common.lds.S              |  4 +
 include/asm-generic/vmlinux.lds.h             |  8 ++
 include/kunit/test.h                          | 82 ++++++++++++-------
 init/main.c                                   |  4 +
 lib/kunit/Makefile                            |  3 +-
 lib/kunit/executor.c                          | 71 ++++++++++++++++
 lib/kunit/test.c                              | 11 ---
 tools/testing/kunit/kunit_kernel.py           |  2 +-
 tools/testing/kunit/kunit_parser.py           | 76 ++++++++++++++---
 .../test_is_test_passed-all_passed.log        |  1 +
 .../test_data/test_is_test_passed-crash.log   |  1 +
 .../test_data/test_is_test_passed-failure.log |  1 +
 13 files changed, 217 insertions(+), 54 deletions(-)
 create mode 100644 lib/kunit/executor.c