Add a test case to verify that arguments passed on the stack are correctly read by an indirect struct_ops trampoline. This test ensures the correctness of stack offsets across various architectures. It is particularly critical for architectures like LoongArch, RISC-V, ARM64, and PowerPC where arguments beyond the first 8 registers are passed on the stack, as well as x86_64 and s390x which have lower register argument limits. Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Link: https://lore.kernel.org/r/20260908073506.29734-1-yangtiezhu@loongson.cn Signed-off-by: Alexei Starovoitov <ast@kernel.org>