On Tue, 7 Nov 2023 09:42:58 +0900 Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx> wrote: > Got it. So does ftrace_regs need a placeholder for direct trampoline? > (Or, can we use a register to pass it?) > I think we don't need to clear it for return_to_handler() but if > `ftrace_regs` spec requires it, it is better to do so. It's per arch defined. I think I wrote somewhere that it just needs to pass back something that can tell if the handler is to return to a direct trampoline or not. It could be a unused register, or something else. It's only needed if an architecture supports direct trampolines. -- Steve
