27 	struct klp_ops *ops;  in klp_find_ops()  local
30 	list_for_each_entry(ops, &klp_ops, node) {  in klp_find_ops()
31 		func = list_first_entry(&ops->func_stack, struct klp_func,  in klp_find_ops()
34 			return ops;  in klp_find_ops()
45 	struct klp_ops *ops;  in klp_ftrace_handler()  local
50 	ops = container_of(fops, struct klp_ops, fops);  in klp_ftrace_handler()
62 	func = list_first_or_null_rcu(&ops->func_stack, struct klp_func,  in klp_ftrace_handler()
109 			if (&func->stack_node == &ops->func_stack)  in klp_ftrace_handler()
129 	struct klp_ops *ops;  in klp_unpatch_func()  local
136 	ops = klp_find_ops(func->old_func);  in klp_unpatch_func()
137 	if (WARN_ON(!ops))  in klp_unpatch_func()
140 	if (list_is_singular(&ops->func_stack)) {  in klp_unpatch_func()
147 		WARN_ON(unregister_ftrace_function(&ops->fops));  in klp_unpatch_func()
148 		WARN_ON(ftrace_set_filter_ip(&ops->fops, ftrace_loc, 1, 0));  in klp_unpatch_func()
151 		list_del(&ops->node);  in klp_unpatch_func()
152 		kfree(ops);  in klp_unpatch_func()
162 	struct klp_ops *ops;  in klp_patch_func()  local
171 	ops = klp_find_ops(func->old_func);  in klp_patch_func()
172 	if (!ops) {  in klp_patch_func()
182 		ops = kzalloc(sizeof(*ops), GFP_KERNEL);  in klp_patch_func()
183 		if (!ops)  in klp_patch_func()
186 		ops->fops.func = klp_ftrace_handler;  in klp_patch_func()
187 		ops->fops.flags = FTRACE_OPS_FL_DYNAMIC |  in klp_patch_func()
194 		list_add(&ops->node, &klp_ops);  in klp_patch_func()
196 		INIT_LIST_HEAD(&ops->func_stack);  in klp_patch_func()
197 		list_add_rcu(&func->stack_node, &ops->func_stack);  in klp_patch_func()
199 		ret = ftrace_set_filter_ip(&ops->fops, ftrace_loc, 0, 0);  in klp_patch_func()
206 		ret = register_ftrace_function(&ops->fops);  in klp_patch_func()
210 			ftrace_set_filter_ip(&ops->fops, ftrace_loc, 1, 0);  in klp_patch_func()
216 		list_add_rcu(&func->stack_node, &ops->func_stack);  in klp_patch_func()
225 	list_del(&ops->node);  in klp_patch_func()
226 	kfree(ops);  in klp_patch_func()