On Tue, 11 Jun 2019 22:05:01 -0500 Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote: > Right now, ftrace has a special hook in the ORC unwinder > (orc_ftrace_find). It would be great if we could get rid of that in > favor of the "always use frame pointers" approach. I'll hold off on > doing the kpatch/kprobe trampoline conversions in my patches since it > would conflict with yours. Basically, IIUC, what you are saying is that the ftrace trampoline should always store the %sp in %rb even when CONFIG_FRAME_POINTER is not enabled? And this can allow you to remove the ftrace specific code from the orc unwinder? -- Steve > > Though, hm, because of pt_regs I guess ORC would need to be able to > decode an encoded frame pointer? I was hoping we could leave those > encoded frame pointers behind in CONFIG_FRAME_POINTER-land forever...
