The existing documentation for funcgraph-retval is outdated and partially incorrect, as it describes limitations that have now been resolved. Recent changes (e.g., using BTF to obtain function return types) have addressed key issues: 1. Return values are now printed only for non-void functions. 2. Values are trimmed to the correct width of the return type, avoiding garbage data from high bits. Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Xiaoqin Zhang <zhangxiaoqin@xiaomi.com> Link: https://patch.msgid.link/20260916133218.1282590-5-dolinux.peng@gmail.com Signed-off-by: pengdonglin <pengdonglin@xiaomi.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>