call_offset 846 arch/x86/kernel/ftrace.c unsigned long call_offset; call_offset 850 arch/x86/kernel/ftrace.c call_offset = (unsigned long)ftrace_regs_call; call_offset 853 arch/x86/kernel/ftrace.c call_offset = (unsigned long)ftrace_call; call_offset 856 arch/x86/kernel/ftrace.c return call_offset - start_offset;