[PATCH] powerpc: Parse early parameters earlier

Currently we have call parse_early_param() earliyish, but not really very
early. In particular, it's not early enough to do things like mem=x or
crashkernel=blah, which is annoying.

So do it earlier. I've checked all the early param handlers, and none of them
look like they should have any trouble with this. I haven't tested the
booke_wdt ones though.

On 32-bit we were doing the CONFIG_CMDLINE logic twice, so don't.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/prom.c

@@ -1292,6 +1292,11 @@ void __init early_init_devtree(void *params)
 	lmb_init();
 	of_scan_flat_dt(early_init_dt_scan_root, NULL);
 	of_scan_flat_dt(early_init_dt_scan_memory, NULL);
+
+	/* Save command line for /proc/cmdline and then parse parameters */
+	strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
+	parse_early_param();
+
 	lmb_enforce_memory_limit(memory_limit);
 	lmb_analyze();
 

arch/powerpc/kernel/setup_32.c

@@ -131,12 +131,6 @@ void __init machine_init(unsigned long dt_ptr, unsigned long phys)
 	/* Do some early initialization based on the flat device tree */
 	early_init_devtree(__va(dt_ptr));
 
-	/* Check default command line */
-#ifdef CONFIG_CMDLINE
-	if (cmd_line[0] == 0)
-		strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
-#endif /* CONFIG_CMDLINE */
-
 	probe_machine();
 
 #ifdef CONFIG_6xx
@@ -235,6 +229,8 @@ arch_initcall(ppc_init);
 /* Warning, IO base is not yet inited */
 void __init setup_arch(char **cmdline_p)
 {
+	*cmdline_p = cmd_line;
+
 	/* so udelay does something sensible, assume <= 1000 bogomips */
 	loops_per_jiffy = 500000000 / HZ;
 
@@ -291,12 +287,6 @@ void __init setup_arch(char **cmdline_p)
 	init_mm.end_data = (unsigned long) _edata;
 	init_mm.brk = klimit;
 
-	/* Save unparsed command line copy for /proc/cmdline */
-	strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
-	*cmdline_p = cmd_line;
-
-	parse_early_param();
-
 	if (do_early_xmon)
 		debugger(NULL);
 

arch/powerpc/kernel/setup_64.c

@@ -414,11 +414,6 @@ void __init setup_system(void)
 	 */
 	register_early_udbg_console();
 
-	/* Save unparsed command line copy for /proc/cmdline */
-	strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
-
-	parse_early_param();
-
 	if (do_early_xmon)
 		debugger(NULL);