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 "mem=2G", will be passed to user space.

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

diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
index 636830fe00f2..d60df3626727 100644
--- a/arch/um/kernel/physmem.c
+++ b/arch/um/kernel/physmem.c
@@ -139,6 +139,8 @@ EXPORT_SYMBOL(phys_mapping);
 static int __init uml_mem_setup(char *line, int *add)
 {
 	char *retptr;
+
+	*add = 0;
 	physmem_size = memparse(line,&retptr);
 	return 0;
 }
-- 
2.34.1