[PATCH 0/2] arm64: ftrace: enable single ftrace_ops for direct calls

[Leon Hwang <leon.hwang@linux.dev>]

Beyond the DIRECT_CALLS support on arm64 [1], select
HAVE_SINGLE_FTRACE_DIRECT_OPS for arm64, which enables the BPF
tracing_multi link on arm64 [2].

All tracing_multi link selftests are passed on arm64.

 cd tools/testing/selftests/bpf
 ./test_progs -a 'tracing_multi_*'
 #545/1   tracing_multi_attach_rollback/put:OK
 #545/2   tracing_multi_attach_rollback/unlink:OK
 #545     tracing_multi_attach_rollback:OK
 #546     tracing_multi_bench_attach:OK
 #547/1   tracing_multi_test/skel_api:OK
 #547/2   tracing_multi_test/link_api_pattern:OK
 #547/3   tracing_multi_test/link_api_ids:OK
 #547/4   tracing_multi_test/module_skel_api:OK
 #547/5   tracing_multi_test/module_link_api_pattern:OK
 #547/6   tracing_multi_test/module_link_api_ids:OK
 #547/7   tracing_multi_test/intersect:OK
 #547/8   tracing_multi_test/cookies:OK
 #547/9   tracing_multi_test/session:OK
 #547/10  tracing_multi_test/attach_api_fails:OK
 #547/11  tracing_multi_test/fentry_direct_access:OK
 #547/12  tracing_multi_test/fexit_direct_access:OK
 #547/13  tracing_multi_test/fsession_direct_access:OK
 #547/14  tracing_multi_test/fentry_after_multi:OK
 #547     tracing_multi_test:OK
 Summary: 3/16 PASSED, 0 SKIPPED, 0 FAILED

 ./test_progs -a 'fill_link_info/tracing_multi_*'
 #132/11  fill_link_info/tracing_multi_link_info:OK
 #132/12  fill_link_info/tracing_multi_invalid_ubuff:OK
 #132     fill_link_info:OK
 Summary: 1/2 PASSED, 0 SKIPPED, 0 FAILED

Links:
[1] https://lore.kernel.org/all/20260609-arm64-ftrace-direct-calls-v1-0-4a46f266697f@linux.dev/
[2] https://github.com/kernel-patches/bpf/pull/12986

Leon Hwang (2):
  arm64: ftrace: enable single ftrace_ops for direct calls
  selftests/bpf: Enable tracing_multi tests on arm64

 arch/arm64/Kconfig                                     | 2 ++
 arch/arm64/kernel/ftrace.c                             | 3 +--
 tools/testing/selftests/bpf/prog_tests/tracing_multi.c | 9 +++++++--
 tools/testing/selftests/bpf/test_progs.h               | 6 ++++++
 4 files changed, 16 insertions(+), 4 deletions(-)

-- 
2.55.0