This parameter is UML specific and is unknown to kernel. It should not
be propagated to kernel, otherwise it will be passed to user space as
an environment option by kernel with a warning like:

Unknown kernel command line parameters "uml_dir=/foo", will be passed to user space.

Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
---
 arch/um/os-Linux/umid.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/um/os-Linux/umid.c b/arch/um/os-Linux/umid.c
index e09d65b05d1c..eb523ab1e218 100644
--- a/arch/um/os-Linux/umid.c
+++ b/arch/um/os-Linux/umid.c
@@ -358,6 +358,8 @@ char *get_umid(void)
 
 static int __init set_uml_dir(char *name, int *add)
 {
+	*add = 0;
+
 	if (*name == '\0') {
 		os_warn("uml_dir can't be an empty string\n");
 		return 0;
-- 
2.34.1