en Copyright 2015 Java http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/bpf/usdt_2.c#304841967c5574fec9307a2c1cdfa8abf30a29fc selftests/bpf: Add test for checking correct nop of optimized usdtAdding test that attaches bpf program on usdt probe in 2 scenarios;- attach program on top of usdt_1, which is single nop instruction, so the probe stays on nop instruction and is not optimized.- attach program on top of usdt_2 which is probe defined on top of nop,nop5 combo, so the probe is placed on top of nop5 and is optimized.Signed-off-by: Jiri Olsa <jolsa@kernel.org>Link: https://lore.kernel.org/r/20260224103915.1369690-5-jolsa@kernel.orgSigned-off-by: Alexei Starovoitov <ast@kernel.org> List of files: /linux/tools/testing/selftests/bpf/usdt_2.c Tue, 24 Feb 2026 11:39:14 +0100 Jiri Olsa <jolsa@kernel.org>