s390/mm: change default addressing mode

Change the default addressing mode so that user space runs in primary space
and the kernel runs in home space.
In addition remove the "switch_amode" kernel parameter so all users who
already specified they want the new default behaviour will stay in the
"switched" mode instead of in the opposite they intended.
If there is a need to switch addressing modes, this can be done with the
"user_mode" kernel parameter: user_mode=home

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/setup.c

@@ -302,7 +302,7 @@ static int __init parse_vmalloc(char *arg)
 }
 early_param("vmalloc", parse_vmalloc);
 
-unsigned int addressing_mode = HOME_SPACE_MODE;
+unsigned int addressing_mode = PRIMARY_SPACE_MODE;
 EXPORT_SYMBOL_GPL(addressing_mode);
 
 static int set_amode_primary(void)
@@ -323,16 +323,6 @@ static int set_amode_primary(void)
 	}
 }
 
-/*
- * Switch kernel/user addressing modes?
- */
-static int __init early_parse_switch_amode(char *p)
-{
-	addressing_mode = PRIMARY_SPACE_MODE;
-	return 0;
-}
-early_param("switch_amode", early_parse_switch_amode);
-
 static int __init early_parse_user_mode(char *p)
 {
 	if (p && strcmp(p, "primary") == 0)