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commit9971c3f944upstream. The test to check if the field is a stack is to be done if it is not a string. But the code had: } if (event->fields[i]->is_stack) { and not } else if (event->fields[i]->is_stack) { which would cause it to always be tested. Worse yet, this also included an "else" statement that was only to be called if the field was not a string and a stack, but this code allows it to be called if it was a string (and not a stack). Also fixed some whitespace issues. Link: https://lore.kernel.org/all/202301302110.mEtNwkBD-lkp@intel.com/ Link: https://lore.kernel.org/linux-trace-kernel/20230131095237.63e3ca8d@gandalf.local.home Cc: Tom Zanussi <zanussi@kernel.org> Fixes:00cf3d672a("tracing: Allow synthetic events to pass around stacktraces") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>