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79e7ec0063
Add selftests covering stack argument passing for both BPF-to-BPF subprog calls and kfunc calls with more than 5 arguments. All tests are 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 callback Kfunc 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 pointer Acked-by: Puranjay Mohan <puranjay@kernel.org> Signed-off-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20260513045127.2397187-1-yonghong.song@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>