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Add a note about the argument and return value accecss will be best effort. Depending on the type, it will be passed via stack or a pair of the registers, but $argN and $retval only support the single register access. Link: https://lore.kernel.org/all/169556269377.146934.14829235476649685954.stgit@devnote2/ Suggested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>