[PATCH] further early_param fixes

[Paul Mackerras <paulus@samba.org>]

Andrew & Tom,

Tom's patches to add early_param also added some code to read the
command line from nvram in setup_arch on PReP boxes.  This broke
powermacs, though, since init_prep_nvram() calls the
ppc_md.nvram_read_val pointer, which is initialized later on
powermac.  In any case we don't want to call the prep nvram code on
powermacs.  This patch fixes it, and also eliminates a compile warning
about early_adb_sync.

Paul.

diff -urN linux-2.6.5-rc2-mm4.orig/arch/ppc/kernel/setup.c linux-2.6.5-rc2-mm4/arch/ppc/kernel/setup.c
--- linux-2.6.5-rc2-mm4.orig/arch/ppc/kernel/setup.c	2004-03-28 15:46:22.621884568 +1000
+++ linux-2.6.5-rc2-mm4/arch/ppc/kernel/setup.c	2004-03-28 16:26:20.297905848 +1000
@@ -470,10 +470,11 @@
 
 #ifdef CONFIG_ADB
 /* Allow us to say that ADB probing will be done synchronously. */
-static void __init early_adb_sync(char **ign)
+static int __init early_adb_sync(char *ign)
 {
 	extern int __adb_probe_sync;
 	__adb_probe_sync = 1;
+	return 0;
 }
 __early_param("adb_sync", early_adb_sync);
 #endif /* CONFIG_ADB */
@@ -663,13 +664,15 @@
 
 	/* See if we need to grab the command line params from PPCBUG. */
 #ifdef CONFIG_PPCBUG_NVRAM
-	/* Read in NVRAM data */
-	init_prep_nvram();
-
-	if (cmd_line[0] == '\0') {
-		char *bootargs = prep_nvram_get_var("bootargs");
-		if (bootargs != NULL)
-			strlcpy(cmd_line, bootargs, sizeof(cmd_line));
+	if (_machine == _MACH_prep) {
+		/* Read in NVRAM data */
+		init_prep_nvram();
+
+		if (cmd_line[0] == '\0') {
+			char *bootargs = prep_nvram_get_var("bootargs");
+			if (bootargs != NULL)
+				strlcpy(cmd_line, bootargs, sizeof(cmd_line));
+		}
 	}
 #endif