init/main.c: check if rdinit was explicitly set before printing warning

The rdinit parameter is set by default, and attempted during boot even if
not specified in the command line.  Only print the warning about rdinit
being inaccessible if the rdinit value was found in command line; it's
just noise otherwise.

[[email protected]: move ramdisk_execute_command_set into __initdata]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Lillian Berry <[email protected]>
Cc: Ahmad Fatoum <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Douglas Anderson <[email protected]>
Cc: Francesco Valla <[email protected]>
Cc: Guo Weikang <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Huan Yang <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: "Mike Rapoport (Microsoft)" <[email protected]>
Cc: Sascha Hauer <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Lillian Berry

init/main.c

@@ -162,6 +162,7 @@ static size_t initargs_offs;
 
 static char *execute_command;
 static char *ramdisk_execute_command = "/init";
+static bool __initdata ramdisk_execute_command_set;
 
 /*
  * Used to generate warnings if static_key manipulation functions are used
@@ -623,6 +624,7 @@ static int __init rdinit_setup(char *str)
 	unsigned int i;
 
 	ramdisk_execute_command = str;
+	ramdisk_execute_command_set = true;
 	/* See "auto" comment in init_setup */
 	for (i = 1; i < MAX_INIT_ARGS; i++)
 		argv_init[i] = NULL;
@@ -1699,8 +1701,9 @@ static noinline void __init kernel_init_freeable(void)
 	int ramdisk_command_access;
 	ramdisk_command_access = init_eaccess(ramdisk_execute_command);
 	if (ramdisk_command_access != 0) {
-		pr_warn("check access for rdinit=%s failed: %i, ignoring\n",
-			ramdisk_execute_command, ramdisk_command_access);
+		if (ramdisk_execute_command_set)
+			pr_warn("check access for rdinit=%s failed: %i, ignoring\n",
+				ramdisk_execute_command, ramdisk_command_access);
 		ramdisk_execute_command = NULL;
 		prepare_namespace();
 	}