diff --git a/include/linux/kmod.h b/include/linux/kmod.h
index c4cbe59..5dc1384 100644
--- a/include/linux/kmod.h
+++ b/include/linux/kmod.h
@@ -51,15 +51,21 @@
 void call_usermodehelper_setcleanup(struct subprocess_info *info,
 				    void (*cleanup)(char **argv, char **envp));
 
+enum umh_wait {
+	UMH_NO_WAIT = -1,	/* don't wait at all */
+	UMH_WAIT_EXEC = 0,	/* wait for the exec, but not the process */
+	UMH_WAIT_PROC = 1,	/* wait for the process to complete */
+};
+
 /* Actually execute the sub-process */
-int call_usermodehelper_exec(struct subprocess_info *info, int wait);
+int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait);
 
 /* Free the subprocess_info. This is only needed if you're not going
    to call call_usermodehelper_exec */
 void call_usermodehelper_freeinfo(struct subprocess_info *info);
 
 static inline int
-call_usermodehelper(char *path, char **argv, char **envp, int wait)
+call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait)
 {
 	struct subprocess_info *info;
 
@@ -71,7 +77,7 @@
 
 static inline int
 call_usermodehelper_keys(char *path, char **argv, char **envp,
-			 struct key *session_keyring, int wait)
+			 struct key *session_keyring, enum umh_wait wait)
 {
 	struct subprocess_info *info;