the memset operation on a automatic array variable can be removed by data Initialization

[Denis Cheng <crquan@gmail.com>]

Signed-Off-By: Denis Cheng <crquan@gmail.com>

--- arch/x86_64/mm/init.c.orig	2007-06-07 10:08:04.000000000 +0800
+++ arch/x86_64/mm/init.c	2007-06-18 14:43:15.000000000 +0800
@@ -406,8 +406,7 @@ void __cpuinit zap_low_mappings(int cpu)
 #ifndef CONFIG_NUMA
 void __init paging_init(void)
 {
-	unsigned long max_zone_pfns[MAX_NR_ZONES];
-	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
+	unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
 	max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
 	max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
 	max_zone_pfns[ZONE_NORMAL] = end_pfn;
-
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