linux.git/lib/kunit/backtrace-suppression-test.c, branch v7.2-rc2 Linux kernel source tree kunit: Add backtrace suppression self-tests 2026-05-14T16:50:00+00:00 Guenter Roeck linux@roeck-us.net 2026-05-14T11:06:38+00:00 bbc960d009a6315f484944506bbb13165069ccc8 Add unit tests to verify that warning backtrace suppression works. Tests cover both API forms: - Scoped: kunit_warning_suppress() with in-block count verification and post-block inactivity check. - Direct functions: kunit_start/end_suppress_warning() with sequential independent suppression blocks and per-block counts. Furthermore, tests verify incremental warning counting, that kunit_has_active_suppress_warning() transitions correctly around suppression boundaries, and that suppression active in the test kthread does not leak to a separate kthread. If backtrace suppression does _not_ work, the unit tests will likely trigger unsuppressed backtraces, which should actually help to get the affected architectures / platforms fixed. Link: https://lore.kernel.org/r/20260514-kunit_add_support-v11-2-b36a530a6d8f@redhat.com Tested-by: Linux Kernel Functional Testing <lkft@linaro.org> Acked-by: Dan Carpenter <dan.carpenter@linaro.org> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Alessandro Carminati <acarmina@redhat.com> Reviewed-by: David Gow <david@davidgow.net> Signed-off-by: Albert Esteve <aesteve@redhat.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org> 
Add unit tests to verify that warning backtrace suppression works.

Tests cover both API forms:
- Scoped: kunit_warning_suppress() with in-block count verification
  and post-block inactivity check.
- Direct functions: kunit_start/end_suppress_warning() with
  sequential independent suppression blocks and per-block counts.

Furthermore, tests verify incremental warning counting, that
kunit_has_active_suppress_warning() transitions correctly around
suppression boundaries, and that suppression active in the test
kthread does not leak to a separate kthread.

If backtrace suppression does _not_ work, the unit tests will likely
trigger unsuppressed backtraces, which should actually help to get
the affected architectures / platforms fixed.

Link: https://lore.kernel.org/r/20260514-kunit_add_support-v11-2-b36a530a6d8f@redhat.com
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Acked-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Alessandro Carminati <acarmina@redhat.com>
Reviewed-by: David Gow <david@davidgow.net>
Signed-off-by: Albert Esteve <aesteve@redhat.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>