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To support BTF argument parsing (such as accessing fields within nested structures via typecasting), the maximum argument string length needs to be extended. Extend MAX_ARGSTR_LEN from 63 to 255. Since MAX_ARGSTR_LEN was previously reused to format command heads in trace_*probe_match_command_head() functions, introduce a dedicated MAX_COMMON_HEAD_LEN (63) macro for matching command heads and switch these functions to use the new macro. Link: https://lore.kernel.org/all/178399140457.27810.11387684872148824707.stgit@devnote2/ Assisted-by: Antigravity:gemini-3.5-flash Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>