On Sat, Mar 20, 2021 at 09:16:16PM +0900, Masami Hiramatsu wrote: > On Fri, 19 Mar 2021 21:22:39 +0900 > Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote: > > > From: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> > > > > Add UNWIND_HINT_FUNC on kretporbe_trampoline code so that ORC > > information is generated on the kretprobe_trampoline correctly. > > > > Test bot also found a new warning for this. > > > >> arch/x86/kernel/kprobes/core.o: warning: objtool: kretprobe_trampoline()+0x25: call without frame pointer save/setup > > With CONFIG_FRAME_POINTER=y. > > Of course this can be fixed with additional "push %bp; mov %sp, %bp" before calling > trampoline_handler. But actually we know that this function has a bit special > stack frame too. > > Can I recover STACK_FRAME_NON_STANDARD(kretprobe_trampoline) when CONFIG_FRAME_POINTER=y ? Yes, that's what I'd recommend. -- Josh
