Merge branch 'bpf-reject-bpf_timer-for-preempt_rt'

Browse source

Leon Hwang says:

====================
bpf: Reject bpf_timer for PREEMPT_RT

While running './test_progs -t timer' to validate the test case from
"selftests/bpf: Introduce experimental bpf_in_interrupt()"[0] for
PREEMPT_RT, I encountered a kernel warning:

BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48

To address this, reject bpf_timer usage in the verifier when
PREEMPT_RT is enabled, and skip the corresponding timer selftests.

Changes:
v2 -> v3:
* Drop skipping test case 'timer_interrupt'.
* Address comments from Alexei:
  * Respin targeting bpf tree.
  * Trim commit log.

v1 -> v2:
* Skip test case 'timer_interrupt'.

Links:
[0] https://lore.kernel.org/bpf/20250903140438.59517-1-leon.hwang@linux.dev/
====================

Link: https://patch.msgid.link/20250910125740.52172-1-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

...

This commit is contained in:

Alexei Starovoitov 2025-09-10 12:34:09 -07:00

parent a3967baad4 fbdd61c94b

commit 91f34aaae0

6 changed files with 24 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

4

kernel/bpf/verifier.c

View file

4

tools/testing/selftests/bpf/prog_tests/free_timer.c

View file

4

tools/testing/selftests/bpf/prog_tests/timer.c

View file

4

tools/testing/selftests/bpf/prog_tests/timer_crash.c

View file

4

tools/testing/selftests/bpf/prog_tests/timer_lockup.c

View file

4

tools/testing/selftests/bpf/prog_tests/timer_mim.c

View file