en Copyright 2015 Java http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/bpf/progs/stack_arg_precision.c#90e43f1b47535cc7aceef3add1a61ba3260b7aee selftests/bpf: Enable stack argument tests for arm64Now that arm64 supports stack arguments, enable the existing stack_arg,stack_arg_kfunc and verifier_stack_arg tests for __TARGET_ARCH_arm64.Signed-off-by: Puranjay Mohan <puranjay@kernel.org>Signed-off-by: Yonghong Song <yonghong.song@linux.dev>Link: https://lore.kernel.org/r/20260513045204.2403441-1-yonghong.song@linux.devSigned-off-by: Alexei Starovoitov <ast@kernel.org> List of files: /linux/tools/testing/selftests/bpf/progs/stack_arg_precision.c Wed, 13 May 2026 06:52:04 +0200 Puranjay Mohan <puranjay@kernel.org> http://kernelsources.org:8080/source/history/linux/tools/testing/selftests/bpf/progs/stack_arg_precision.c#6e277efbb19dd1a536cbffd9ea5c049a427dc7cb selftests/bpf: Add precision backtracking test for stack argumentsAdd a test that verifies precision backtracking works correctlyacross BPF-to-BPF calls when stack arguments are involved.The test passes a size value as incoming stack arg (arg6) to asubprog, which forwards it as the mem__sz parameter (outgoing arg7)to bpf_kfunc_call_stack_arg_mem. The expected __msg annotationsverify that precision propagates from the kfunc's mem__sz argumentback through the subprog frame to the caller's outgoing stack argstore.A companion BTF file (btf__stack_arg_precision.c) provides namedparameter BTF for the __naked subprog via __btf_func_path.Signed-off-by: Yonghong Song <yonghong.song@linux.dev>Link: https://lore.kernel.org/r/20260513045148.2400087-1-yonghong.song@linux.devSigned-off-by: Alexei Starovoitov <ast@kernel.org> List of files: /linux/tools/testing/selftests/bpf/progs/stack_arg_precision.c Wed, 13 May 2026 06:51:48 +0200 Yonghong Song <yonghong.song@linux.dev>