um: Do not propagate mem 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 "mem=2G", will be passed to user space.

Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Link: https://patch.msgid.link/20241011040441.1586345-3-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
index 636830fe00f257c655316060d719d0e31e7d7dbd..d60df3626727983797e5e4c5ccd654b58c860037 100644 (file)
--- 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;
 }