function_hook 15 arch/x86/kernel/ftrace_32.S # define function_hook __fentry__ function_hook 24 arch/x86/kernel/ftrace_32.S ENTRY(function_hook) function_hook 17 arch/x86/kernel/ftrace_64.S # define function_hook __fentry__ function_hook 135 arch/x86/kernel/ftrace_64.S ENTRY(function_hook) function_hook 251 arch/x86/kernel/ftrace_64.S ENTRY(function_hook)