[patch 4/5] x86: smpboot maxcpus - add checking for NULL early param

[Cyrill Gorcunov]

Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxx>
---

Index: linux-2.6.git/arch/x86/kernel/smpboot.c
====================================================================
--- linux-2.6.git.orig/arch/x86/kernel/smpboot.c	2008-06-28 21:15:44.000000000 +0400
+++ linux-2.6.git/arch/x86/kernel/smpboot.c	2008-07-05 12:53:28.000000000 +0400
@@ -1383,7 +1383,8 @@ static int __init parse_maxcpus(char *ar
 {
 	extern unsigned int maxcpus;
 
-	maxcpus = simple_strtoul(arg, NULL, 0);
+	if (arg)
+		maxcpus = simple_strtoul(arg, NULL, 0);
 	return 0;
 }
 early_param("maxcpus", parse_maxcpus);

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