diff --git a/fs/proc/cmdline.c b/fs/proc/cmdline.c
index fa762c5fbcb2..91fe1597af7b 100644
--- a/fs/proc/cmdline.c
+++ b/fs/proc/cmdline.c
@@ -3,6 +3,7 @@
 #include <linux/init.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
+#include "internal.h"
 
 static int cmdline_proc_show(struct seq_file *m, void *v)
 {
@@ -13,7 +14,10 @@ static int cmdline_proc_show(struct seq_file *m, void *v)
 
 static int __init proc_cmdline_init(void)
 {
-	proc_create_single("cmdline", 0, NULL, cmdline_proc_show);
+	struct proc_dir_entry *pde;
+
+	pde = proc_create_single("cmdline", 0, NULL, cmdline_proc_show);
+	pde->size = saved_command_line_len + 1;
 	return 0;
 }
 fs_initcall(proc_cmdline_init);
diff --git a/include/linux/init.h b/include/linux/init.h
index 077d7f93b402..2e96756fe1ff 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -143,6 +143,7 @@ struct file_system_type;
 extern int do_one_initcall(initcall_t fn);
 extern char __initdata boot_command_line[];
 extern char *saved_command_line;
+extern unsigned int saved_command_line_len;
 extern unsigned int reset_devices;
 
 /* used by init/main.c */
diff --git a/init/main.c b/init/main.c
index aa21add5f7c5..d213371cc067 100644
--- a/init/main.c
+++ b/init/main.c
@@ -145,7 +145,8 @@ void (*__initdata late_time_init)(void);
 /* Untouched command line saved by arch-specific code. */
 char __initdata boot_command_line[COMMAND_LINE_SIZE];
 /* Untouched saved command line (eg. for /proc) */
-char *saved_command_line;
+char *saved_command_line __ro_after_init;
+unsigned int saved_command_line_len __ro_after_init;
 /* Command line for parameter parsing */
 static char *static_command_line;
 /* Untouched extra command line */
@@ -667,6 +668,8 @@ static void __init setup_command_line(char *command_line)
 			strcpy(saved_command_line + len, extra_init_args);
 		}
 	}
+
+	saved_command_line_len = strlen(saved_command_line);
 }
 
 /*
@@ -1379,7 +1382,7 @@ static void __init do_initcall_level(int level, char *command_line)
 static void __init do_initcalls(void)
 {
 	int level;
-	size_t len = strlen(saved_command_line) + 1;
+	size_t len = saved_command_line_len + 1;
 	char *command_line;
 
 	command_line = kzalloc(len, GFP_KERNEL);