On Thu, 28 Jan 2016, Jessica Yu wrote: > So it doesn't look like a simple priority tweak will work, since we want a > ftrace->klp->klp->ftrace ordering from module load->module unload. Perhaps we > can split the ftrace and klp notifiers into separate coming and going handlers > with the appropriate priorities set to enforce correct ordering (not terribly > pretty, but it works). Is there a better solution?
Given the facts that: - we want the ordering ftrace -> klp for load and klp -> ftrace for unload - we already do have separate klp_module_notify_coming() and klp_module_notify_going(), and klp_module_notify() is just a stub that decides which one to call I'd suggest we keep just a single ftrace_module_notify() (with INT_MIN+1, priority), and then introduce separate notifiers - klp_module_notify_going() with INT_MIN+2, that triggers action iff action == MODULE_STATE_GOING - klp_module_notify_going() with INT_MIN, that triggers action only iff action == MODULE_STATE_COMING Thanks, -- Jiri Kosina SUSE Labs
