dt/flattree: explicitly pass command line pointer to early_init_dt_scan_chosen

This patch drops the reference to a global 'cmd_line' variable from
early_init_dt_scan_chosen, and instead passes the pointer to the command
line string via the *data argument.  Each architecture does something
slightly different with the initial command line, so it makes sense for
the architecture to be able to specify the variable name.
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

arch/microblaze/kernel/prom.c

@@ -130,7 +130,7 @@ void __init early_init_devtree(void *params)
 	 * device-tree, including the platform type, initrd location and
 	 * size, TCE reserve, and more ...
 	 */
-	of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
+	of_scan_flat_dt(early_init_dt_scan_chosen, cmd_line);
 
 	/* Scan memory nodes and rebuild MEMBLOCKs */
 	memblock_init();

arch/mips/include/asm/prom.h

@@ -14,9 +14,6 @@
 #ifdef CONFIG_OF
 #include <asm/bootinfo.h>
 
-/* which is compatible with the flattened device tree (FDT) */
-#define cmd_line arcs_cmdline
-
 extern int early_init_dt_scan_memory_arch(unsigned long node,
 	const char *uname, int depth, void *data);
 

arch/mips/kernel/prom.c

@@ -83,7 +83,8 @@ void __init early_init_devtree(void *params)
 	 * device-tree, including the platform type, initrd location and
 	 * size, and more ...
 	 */
-	of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
+	of_scan_flat_dt(early_init_dt_scan_chosen, arcs_cmdline);
+
 
 	/* Scan memory nodes */
 	of_scan_flat_dt(early_init_dt_scan_root, NULL);

arch/powerpc/kernel/prom.c

@@ -691,7 +691,7 @@ void __init early_init_devtree(void *params)
 	 * device-tree, including the platform type, initrd location and
 	 * size, TCE reserve, and more ...
 	 */
-	of_scan_flat_dt(early_init_dt_scan_chosen_ppc, NULL);
+	of_scan_flat_dt(early_init_dt_scan_chosen_ppc, cmd_line);
 
 	/* Scan memory nodes and rebuild MEMBLOCKs */
 	memblock_init();

drivers/of/fdt.c

@@ -670,7 +670,7 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
 
 	pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
 
-	if (depth != 1 ||
+	if (depth != 1 || !data ||
 	    (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
 		return 0;
 
@@ -679,16 +679,16 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
 	/* Retrieve command line */
 	p = of_get_flat_dt_prop(node, "bootargs", &l);
 	if (p != NULL && l > 0)
-		strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
+		strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
 
 #ifdef CONFIG_CMDLINE
 #ifndef CONFIG_CMDLINE_FORCE
 	if (p == NULL || l == 0 || (l == 1 && (*p) == 0))
 #endif
-		strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+		strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
 #endif /* CONFIG_CMDLINE */
 
-	pr_debug("Command line is: %s\n", cmd_line);
+	pr_debug("Command line is: %s\n", (char*)data);
 
 	/* break now */
 	return 1;