Changes in stack_arg.c

157317ba662a7c476320fdb334216154eaa8b856 - selftests/bpf: Use at least 10 args in stack argument tests

Thu, 28 May 2026 18:17:48 +0200

selftests/bpf: Use at least 10 args in stack argument testsOn arm64, the first 8 arguments are passed in registers (x0-x7), sotests with 8 or fewer arguments never exercise the native stack argumentpath in the JIT. Increase argument counts to at least 10 across allBPF-to-BPF subprog and kfunc stack argument tests so that at least 2arguments land on the arm64 stack.For the two-callees test, bump foo1 from 8 to 10 and foo2 from 10 to 12args to preserve the different-stack-depth flavor of the test.The bpf_kfunc_call_stack_arg_mem kfunc is left unchanged at 7 args toavoid breaking the precision backtracking test which relies on hardcodedverifier log instruction indices.Suggested-by: Will Deacon Signed-off-by: Puranjay Mohan Acked-by: Yonghong Song Link: https://lore.kernel.org/r/20260528161750.1900674-3-puranjay@kernel.orgSigned-off-by: Alexei Starovoitov List of files: /linux/tools/testing/selftests/bpf/progs/stack_arg.c

90e43f1b47535cc7aceef3add1a61ba3260b7aee - selftests/bpf: Enable stack argument tests for arm64

Wed, 13 May 2026 06:52:04 +0200

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 Signed-off-by: Yonghong Song Link: https://lore.kernel.org/r/20260513045204.2403441-1-yonghong.song@linux.devSigned-off-by: Alexei Starovoitov List of files: /linux/tools/testing/selftests/bpf/progs/stack_arg.c

79e7ec00634e95e20217ba922906574041b9bbf0 - selftests/bpf: Add tests for BPF function stack arguments

Wed, 13 May 2026 06:51:27 +0200

selftests/bpf: Add tests for BPF function stack argumentsAdd selftests covering stack argument passing for both BPF-to-BPFsubprog calls and kfunc calls with more than 5 arguments. All testsare guarded by __BPF_FEATURE_STACK_ARGUMENT and __TARGET_ARCH_x86.BPF-to-BPF subprog call tests (stack_arg.c): - Scalar stack args - Pointer stack args - Mixed pointer/scalar stack args - Nested calls - Dynptr stack arg - Two callees with different stack arg counts - Async callbackKfunc call tests (stack_arg_kfunc.c, with bpf_testmod kfuncs): - Scalar stack args - Pointer stack args - Mixed pointer/scalar stack args - Dynptr stack arg - Memory buffer + size pair - Iterator - Const string pointer - Timer pointerAcked-by: Puranjay Mohan Signed-off-by: Yonghong Song Link: https://lore.kernel.org/r/20260513045127.2397187-1-yonghong.song@linux.devSigned-off-by: Alexei Starovoitov List of files: /linux/tools/testing/selftests/bpf/progs/stack_arg.c