um: Do not propagate uml_dir parameter to kernel

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>
Link: https://patch.msgid.link/20241011040441.1586345-4-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/arch/um/os-Linux/umid.c b/arch/um/os-Linux/umid.c
index e09d65b05d1cab8892915d9eff2a586c4f6077a7..eb523ab1e2189be26c92e607761a7df6fd88b363 100644 (file)
--- 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;