diff --git a/kernel/livepatch/patch.c b/kernel/livepatch/patch.c
index 82d5842..bd43537 100644
--- a/kernel/livepatch/patch.c
+++ b/kernel/livepatch/patch.c
@@ -1,22 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * patch.c - livepatch patching functions
  *
  * Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
  * Copyright (C) 2014 SUSE
  * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -34,7 +22,7 @@
 
 static LIST_HEAD(klp_ops);
 
-struct klp_ops *klp_find_ops(unsigned long old_addr)
+struct klp_ops *klp_find_ops(void *old_func)
 {
 	struct klp_ops *ops;
 	struct klp_func *func;
@@ -42,7 +30,7 @@
 	list_for_each_entry(ops, &klp_ops, node) {
 		func = list_first_entry(&ops->func_stack, struct klp_func,
 					stack_node);
-		if (func->old_addr == old_addr)
+		if (func->old_func == old_func)
 			return ops;
 	}
 
@@ -61,7 +49,7 @@
 	ops = container_of(fops, struct klp_ops, fops);
 
 	/*
-	 * A variant of synchronize_sched() is used to allow patching functions
+	 * A variant of synchronize_rcu() is used to allow patching functions
 	 * where RCU is not watching, see klp_synchronize_transition().
 	 */
 	preempt_disable_notrace();
@@ -72,7 +60,7 @@
 	/*
 	 * func should never be NULL because preemption should be disabled here
 	 * and unregister_ftrace_function() does the equivalent of a
-	 * synchronize_sched() before the func_stack removal.
+	 * synchronize_rcu() before the func_stack removal.
 	 */
 	if (WARN_ON_ONCE(!func))
 		goto unlock;
@@ -118,7 +106,15 @@
 		}
 	}
 
+	/*
+	 * NOPs are used to replace existing patches with original code.
+	 * Do nothing! Setting pc would cause an infinite loop.
+	 */
+	if (func->nop)
+		goto unlock;
+
 	klp_arch_set_pc(regs, (unsigned long)func->new_func);
+
 unlock:
 	preempt_enable_notrace();
 }
@@ -142,17 +138,18 @@
 
 	if (WARN_ON(!func->patched))
 		return;
-	if (WARN_ON(!func->old_addr))
+	if (WARN_ON(!func->old_func))
 		return;
 
-	ops = klp_find_ops(func->old_addr);
+	ops = klp_find_ops(func->old_func);
 	if (WARN_ON(!ops))
 		return;
 
 	if (list_is_singular(&ops->func_stack)) {
 		unsigned long ftrace_loc;
 
-		ftrace_loc = klp_get_ftrace_location(func->old_addr);
+		ftrace_loc =
+			klp_get_ftrace_location((unsigned long)func->old_func);
 		if (WARN_ON(!ftrace_loc))
 			return;
 
@@ -174,17 +171,18 @@
 	struct klp_ops *ops;
 	int ret;
 
-	if (WARN_ON(!func->old_addr))
+	if (WARN_ON(!func->old_func))
 		return -EINVAL;
 
 	if (WARN_ON(func->patched))
 		return -EINVAL;
 
-	ops = klp_find_ops(func->old_addr);
+	ops = klp_find_ops(func->old_func);
 	if (!ops) {
 		unsigned long ftrace_loc;
 
-		ftrace_loc = klp_get_ftrace_location(func->old_addr);
+		ftrace_loc =
+			klp_get_ftrace_location((unsigned long)func->old_func);
 		if (!ftrace_loc) {
 			pr_err("failed to find location for function '%s'\n",
 				func->old_name);
@@ -236,15 +234,26 @@
 	return ret;
 }
 
-void klp_unpatch_object(struct klp_object *obj)
+static void __klp_unpatch_object(struct klp_object *obj, bool nops_only)
 {
 	struct klp_func *func;
 
-	klp_for_each_func(obj, func)
+	klp_for_each_func(obj, func) {
+		if (nops_only && !func->nop)
+			continue;
+
 		if (func->patched)
 			klp_unpatch_func(func);
+	}
 
-	obj->patched = false;
+	if (obj->dynamic || !nops_only)
+		obj->patched = false;
+}
+
+
+void klp_unpatch_object(struct klp_object *obj)
+{
+	__klp_unpatch_object(obj, false);
 }
 
 int klp_patch_object(struct klp_object *obj)
@@ -267,11 +276,21 @@
 	return 0;
 }
 
-void klp_unpatch_objects(struct klp_patch *patch)
+static void __klp_unpatch_objects(struct klp_patch *patch, bool nops_only)
 {
 	struct klp_object *obj;
 
 	klp_for_each_object(patch, obj)
 		if (obj->patched)
-			klp_unpatch_object(obj);
+			__klp_unpatch_object(obj, nops_only);
+}
+
+void klp_unpatch_objects(struct klp_patch *patch)
+{
+	__klp_unpatch_objects(patch, false);
+}
+
+void klp_unpatch_objects_dynamic(struct klp_patch *patch)
+{
+	__klp_unpatch_objects(patch, true);
 }