The current kunit execution model is to provide base kunit functionality and tests built-in to the kernel. The aim of this series is to allow building kunit itself and tests as modules. This in turn allows a simple form of selective execution; load the module you wish to test. In doing so, kunit itself (if also built as a module) will be loaded as an implicit dependency.

Because this requires a core API modification - if a module delivers multiple suites, they must be declared with the kunit_test_suites() macro - we're proposing this patch set as a candidate to be applied to the test tree before too many kunit consumers appear. We attempt to deal with existing consumers in patch 3.

Changes since v6: - reintroduce kunit_test_suite() definition to handle users in other trees not yet converted to using kunit_test_suites() (kbuild error when applying patches to ext4/dev tree) - modify drivers/base/power/qos-test.c to use kunit_test_suites() to register suite. We do not convert it to support module build now as the suite uses a few unexported function; see patch 3 for details.

Changes since v5: - fixed fs/ext4/Makefile to remove unneeded conditional compilation (Iurii, patch 3) - added Reviewed-by, Acked-by to patches 3, 4, 5 and 6

Changes since v4: - fixed signoff chain to use Co-developed-by: prior to Knut's signoff (Stephen, all patches) - added Reviewed-by, Tested-by for patches 1, 2, 4 and 6 - updated comment describing try-catch-impl.h (Stephen, patch 2) - fixed MODULE_LICENSEs to be GPL v2 (Stephen, patches 3, 5) - added __init to kunit_init() (Stephen, patch 5)

Changes since v3: - removed symbol lookup patch for separate submission later - removed use of sysctl_hung_task_timeout_seconds (patch 4, as discussed with Brendan and Stephen) - disabled build of string-stream-test when CONFIG_KUNIT_TEST=m; this is to avoid having to deal with symbol lookup issues - changed string-stream-impl.h back to string-stream.h (Brendan) - added module build support to new list, ext4 tests

Changes since v2: - moved string-stream.h header to lib/kunit/string-stream-impl.h (Brendan) (patch 1) - split out non-exported interfaces in try-catch-impl.h (Brendan) (patch 2) - added kunit_find_symbol() and KUNIT_INIT_SYMBOL to lookup non-exported symbols (patches 3, 4) - removed #ifdef MODULE around module licenses (Randy, Brendan, Andy) (patch 4) - replaced kunit_test_suite() with kunit_test_suites() rather than supporting both (Brendan) (patch 4) - lookup sysctl_hung_task_timeout_secs as kunit may be built as a module and the symbol may not be available (patch 5)

Alan Maguire (6): kunit: move string-stream.h to lib/kunit kunit: hide unexported try-catch interface in try-catch-impl.h kunit: allow kunit tests to be loaded as a module kunit: remove timeout dependence on sysctl_hung_task_timeout_seconds kunit: allow kunit to be loaded as a module kunit: update documentation to describe module-based build

Documentation/dev-tools/kunit/faq.rst | 3 +- Documentation/dev-tools/kunit/index.rst | 3 ++ Documentation/dev-tools/kunit/usage.rst | 16 ++++++++++ drivers/base/power/qos-test.c | 2 +- fs/ext4/Kconfig | 2 +- fs/ext4/Makefile | 3 +- fs/ext4/inode-test.c | 4 ++- include/kunit/assert.h | 3 +- include/kunit/test.h | 37 ++++++++++++++++------ include/kunit/try-catch.h | 10 ------ kernel/sysctl-test.c | 4 ++- lib/Kconfig.debug | 4 +-- lib/kunit/Kconfig | 6 ++-- lib/kunit/Makefile | 14 +++++--- lib/kunit/assert.c | 10 ++++++ lib/kunit/{example-test.c => kunit-example-test.c} | 4 ++- lib/kunit/{test-test.c => kunit-test.c} | 7 ++-- lib/kunit/string-stream-test.c | 5 +-- lib/kunit/string-stream.c | 3 +- {include => lib}/kunit/string-stream.h | 0 lib/kunit/test.c | 25 ++++++++++++++- lib/kunit/try-catch-impl.h | 27 ++++++++++++++++ lib/kunit/try-catch.c | 37 +++++----------------- lib/list-test.c | 4 ++- 24 files changed, 160 insertions(+), 73 deletions(-) rename lib/kunit/{example-test.c => kunit-example-test.c} (97%) rename lib/kunit/{test-test.c => kunit-test.c} (98%) rename {include => lib}/kunit/string-stream.h (100%) create mode 100644 lib/kunit/try-catch-impl.h