kernel/linux.git/tools/testing/selftests/uevent, branch v7.2-rc1

selftests/uevent: increase __UEVENT_BUFFER_SIZE to avoid ENOBUFS on busy systems

2026-06-17T22:37:46+00:00

The kselftests case uevent.uevent_filtering fails reproducibly on busy systems (e.g. Intel EMR / AMD servers) with: No buffer space available - Failed to receive uevent The listener binds the NETLINK_KOBJECT_UEVENT socket to all 32 multicast groups (nl_groups = -1) but only sets SO_RCVBUF to 4 KiB (__UEVENT_BUFFER_SIZE = 2048 * 2). On hosts with many devices, the kernel and userspace daemons (udev/systemd) constantly emit uevents on multiple groups, plus the test itself triggers 10 add events in a row. The 4 KiB receive buffer overflows before the listener can drain it, recvmsg() returns -ENOBUFS, and the test bails out as failure. Increase __UEVENT_BUFFER_SIZE to 1 MiB so the receive buffer is large enough to absorb the burst of uevents on busy systems. After this change the test passes consistently across dozens of runs on Intel EMR and AMD platforms. Link: https://lore.kernel.org/20260608053934.4059533-1-kanie@linux.alibaba.com Signed-off-by: Guixin Liu Cc: Christian Brauner Cc: Shuah Khan Cc: Wei Yang Signed-off-by: Andrew Morton

selftests: complete kselftest include centralization

2025-11-27T22:24:31+00:00

This follow-up patch completes centralization of kselftest.h and ksefltest_harness.h includes in remaining seltests files, replacing all relative paths with a non-relative paths using shared -I include path in lib.mk Tested with gcc-13.3 and clang-18.1, and cross-compiled successfully on riscv, arm64, x86_64 and powerpc arch. [reddybalavignesh9979@gmail.com: add selftests include path for kselftest.h] Link: https://lkml.kernel.org/r/20251017090201.317521-1-reddybalavignesh9979@gmail.com Link: https://lkml.kernel.org/r/20251016104409.68985-1-reddybalavignesh9979@gmail.com Signed-off-by: Bala-Vignesh-Reddy Suggested-by: Andrew Morton Link: https://lore.kernel.org/lkml/20250820143954.33d95635e504e94df01930d0@linux-foundation.org/ Reviewed-by: Wei Yang Cc: David Hildenbrand Cc: David S. Miller Cc: Eric Dumazet Cc: Günther Noack Cc: Jakub Kacinski Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mickael Salaun Cc: Ming Lei Cc: Paolo Abeni Cc: Shuah Khan Cc: Simon Horman Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton

selftests: uevent: add missing gitignore

2024-02-20T23:30:40+00:00

The 'uevent_filtering' test generates an object with the same name, but there is no .gitignore file in the directory to add the object as stated in the selftest documentation. Add the missing .gitignore file and include 'uevent_filtering'. Signed-off-by: Javier Carrasco Signed-off-by: Shuah Khan

selftests: uevent filtering: fix return on error in uevent_listener

2023-10-05T20:28:53+00:00

The ret variable is used to check function return values and assigning values to it on error has no effect as it is an unused value. The current implementation uses an additional variable (fret) to return the error value, which in this case is unnecessary and lead to the above described misuse. There is no restriction in the current implementation to always return -1 on error and the actual negative error value can be returned safely without storing -1 in a specific variable. Simplify the error checking by using a single variable which always holds the returned value. Signed-off-by: Javier Carrasco Signed-off-by: Shuah Khan

selftests: Remove unneeded selftest API headers

2020-07-06T21:59:07+00:00

Remove unused includes of the kselftest.h header. Acked-by: Christian Brauner Signed-off-by: Kees Cook Signed-off-by: Shuah Khan

selftests: uevent filtering

2018-05-23T19:24:22+00:00

Recent discussions around uevent filtering (cf. net-next commit [1], [2], and [3] and discussions in [4], [5], and [6]) have shown that the semantics around uevent filtering where not well understood. Now that we have settled - at least for the moment - how uevent filtering should look like let's add some selftests to ensure we don't regress anything in the future. Note, the semantics of uevent filtering are described in detail in my commit message to [2] so I won't repeat them here. [1]: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=90d52d4fd82007005125d9a8d2d560a1ca059b9d [2]: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=a3498436b3a0f8ec289e6847e1de40b4123e1639 [3]: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=26045a7b14bc7a5455e411d820110f66557d6589 [4]: https://lkml.org/lkml/2018/4/4/739 [5]: https://lkml.org/lkml/2018/4/26/767 [6]: https://lkml.org/lkml/2018/4/26/738 Signed-off-by: Christian Brauner Signed-off-by: David S. Miller