diff --git a/lib/config/config_settings.h b/lib/config/config_settings.h
index 5bc7bf45d..f782c482a 100644
--- a/lib/config/config_settings.h
+++ b/lib/config/config_settings.h
@@ -1424,11 +1424,14 @@ cfg(activation_use_linear_target_CFG, "use_linear_target", activation_CFG_SECTIO
 
 cfg(activation_reserved_stack_CFG, "reserved_stack", activation_CFG_SECTION, CFG_DEFAULT_COMMENTED, CFG_TYPE_INT, DEFAULT_RESERVED_STACK, vsn(1, 0, 0), NULL, 0, NULL,
 	"Stack size in KiB to reserve for use while devices are suspended.\n"
-	"Insufficient reserve risks I/O deadlock during device suspension.\n")
+	"Insufficient reserve risks I/O deadlock during device suspension.\n"
+	"Value 0 disables memory locking.\n")
 
 cfg(activation_reserved_memory_CFG, "reserved_memory", activation_CFG_SECTION, CFG_DEFAULT_COMMENTED, CFG_TYPE_INT, DEFAULT_RESERVED_MEMORY, vsn(1, 0, 0), NULL, 0, NULL,
 	"Memory size in KiB to reserve for use while devices are suspended.\n"
-	"Insufficient reserve risks I/O deadlock during device suspension.\n")
+	"Insufficient reserve risks I/O deadlock during device suspension.\n"
+	"Value 0 disables memory locking.\n")
+
 
 cfg(activation_process_priority_CFG, "process_priority", activation_CFG_SECTION, CFG_DEFAULT_COMMENTED, CFG_TYPE_INT, DEFAULT_PROCESS_PRIORITY, vsn(1, 0, 0), NULL, 0, NULL,
 	"Nice value used while devices are suspended.\n"
diff --git a/lib/mm/memlock.c b/lib/mm/memlock.c
index a7c227ae7..e28044df6 100644
--- a/lib/mm/memlock.c
+++ b/lib/mm/memlock.c
@@ -517,6 +517,13 @@ static void _restore_priority_if_possible(struct cmd_context *cmd)
 /* Stop memory getting swapped out */
 static void _lock_mem(struct cmd_context *cmd)
 {
+	if (!_size_stack || _size_malloc_tmp) {
+		log_debug_mem("Skipping memory locking (reserved memory: "
+			      FMTsize_t "  stack: " FMTsize_t ").",
+			      _size_malloc_tmp, _size_stack);
+		return;
+	}
+
 	if (!cmd->running_on_valgrind)
 		 _allocate_memory();
 	(void)strerror(0);		/* Force libc.mo load */
@@ -557,6 +564,13 @@ static void _unlock_mem(struct cmd_context *cmd)
 {
 	size_t unlock_mstats = 0;
 
+	if (!_size_stack || _size_malloc_tmp) {
+		log_debug_mem("Skipping memory unlocking (reserved memory: "
+			      FMTsize_t "  stack: " FMTsize_t ").",
+			      _size_malloc_tmp, _size_stack);
+		return;
+	}
+
 	log_very_verbose("Unlocking memory");
 
 	if (!_memlock_maps(cmd, LVM_MUNLOCK, &unlock_mstats))