[PATCH v2 0/6] kselftests: livepatch: Adapt tests to be executed on 4.12 kernels

Marcos Paulo de Souza
2026-04-13T17:26:22Z

A new version of the patchset, with fewer patches now. Please take a look!

Original cover-letter:
These patches don't really change how the patches are run, just skip
some tests on kernels that don't support a feature (like kprobe and
livepatched living together) or when a livepatch sysfs attribute is
missing.

The last patch slightly adjusts check_result function to skip dmesg
messages on SLE kernels when a livepatch is removed.

These patches are based on printk/for-next branch.

Please review! Thanks!

Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
---
Changes in v2:
- Patch descriptions were changed to remove "test-X", since it was polluting the commit subjects (Miroslav Benes)
- Patch 8 was dropped since it was checking for a message from an out-of-tree patch. (Petr Mladek)
- Patch 3 was dropped as should be treated as expected failure for older kernels. (Petr Mladek)
- Patch 2 was changed to use y/n instead of 1/0, since it's more natural to use it.
- Patch 1 was changed to handle ppc and loongson, and error out if dealing with a different architecture that sets
CONFIG_ARCH_HAS_SYSCALL_WRAPPER and haven't changed the test to include the proper wrapper prefix.
- Patch 4 was changed to invert the return of the bash function to return 1 in failure, like
a normal bash function (Joe Lawrence)
- Patches 5, 6 an 7 were changed to not split the tests, but to only run the tests
when the attribute were present (Miroslav Benes)
- Link to v1: https://patch.msgid.link/20260313-lp-tests-old-fixes-v1-0-71ac6dfb3253@suse.com

---
Marcos Paulo de Souza (6):
selftests: livepatch: Check for ARCH_HAS_SYSCALL_WRAPPER config
selftests: livepatch: Replace true/false module parameter by y/n
selftests: livepatch: Introduce does_sysfs_exists function
selftests: livepatch: Check if patched sysfs attribute exists
selftests: livepatch: Check if replace sysfs attribute exists
selftests: livepatch: Check if stack_order sysfs attribute exists

tools/testing/selftests/livepatch/functions.sh | 10 ++
tools/testing/selftests/livepatch/test-kprobe.sh | 8 +-
tools/testing/selftests/livepatch/test-sysfs.sh | 120 ++++++++++++---------
.../livepatch/test_modules/test_klp_syscall.c | 17 ++-
4 files changed, 99 insertions(+), 56 deletions(-)
---
base-commit: 712c0756828becbfc629ff8d8b82deff5d1115e4
change-id: 20260309-lp-tests-old-fixes-f955abc8ec27

Best regards,
--
Marcos Paulo de Souza <mpdesouza@suse.com>