39 	struct klp_ops *ops;  in klp_find_ops()  local
42 	list_for_each_entry(ops, &klp_ops, node) {  in klp_find_ops()
43 		func = list_first_entry(&ops->func_stack, struct klp_func,  in klp_find_ops()
46 			return ops;  in klp_find_ops()
57 	struct klp_ops *ops;  in klp_ftrace_handler()  local
61 	ops = container_of(fops, struct klp_ops, fops);  in klp_ftrace_handler()
69 	func = list_first_or_null_rcu(&ops->func_stack, struct klp_func,  in klp_ftrace_handler()
116 			if (&func->stack_node == &ops->func_stack)  in klp_ftrace_handler()
141 	struct klp_ops *ops;  in klp_unpatch_func()  local
148 	ops = klp_find_ops(func->old_addr);  in klp_unpatch_func()
149 	if (WARN_ON(!ops))  in klp_unpatch_func()
152 	if (list_is_singular(&ops->func_stack)) {  in klp_unpatch_func()
159 		WARN_ON(unregister_ftrace_function(&ops->fops));  in klp_unpatch_func()
160 		WARN_ON(ftrace_set_filter_ip(&ops->fops, ftrace_loc, 1, 0));  in klp_unpatch_func()
163 		list_del(&ops->node);  in klp_unpatch_func()
164 		kfree(ops);  in klp_unpatch_func()
174 	struct klp_ops *ops;  in klp_patch_func()  local
183 	ops = klp_find_ops(func->old_addr);  in klp_patch_func()
184 	if (!ops) {  in klp_patch_func()
194 		ops = kzalloc(sizeof(*ops), GFP_KERNEL);  in klp_patch_func()
195 		if (!ops)  in klp_patch_func()
198 		ops->fops.func = klp_ftrace_handler;  in klp_patch_func()
199 		ops->fops.flags = FTRACE_OPS_FL_SAVE_REGS |  in klp_patch_func()
203 		list_add(&ops->node, &klp_ops);  in klp_patch_func()
205 		INIT_LIST_HEAD(&ops->func_stack);  in klp_patch_func()
206 		list_add_rcu(&func->stack_node, &ops->func_stack);  in klp_patch_func()
208 		ret = ftrace_set_filter_ip(&ops->fops, ftrace_loc, 0, 0);  in klp_patch_func()
215 		ret = register_ftrace_function(&ops->fops);  in klp_patch_func()
219 			ftrace_set_filter_ip(&ops->fops, ftrace_loc, 1, 0);  in klp_patch_func()
225 		list_add_rcu(&func->stack_node, &ops->func_stack);  in klp_patch_func()
234 	list_del(&ops->node);  in klp_patch_func()
235 	kfree(ops);  in klp_patch_func()