x86/iommu: use __GFP_ZERO instead of memset for GART

Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/pci-gart_64.c

@@ -674,13 +674,13 @@ static __init int init_k8_gatt(struct agp_kern_info *info)
 	info->aper_size = aper_size >> 20;
 
 	gatt_size = (aper_size >> PAGE_SHIFT) * sizeof(u32);
-	gatt = (void *)__get_free_pages(GFP_KERNEL, get_order(gatt_size));
+	gatt = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+					get_order(gatt_size));
 	if (!gatt)
 		panic("Cannot allocate GATT table");
 	if (set_memory_uc((unsigned long)gatt, gatt_size >> PAGE_SHIFT))
 		panic("Could not set GART PTEs to uncacheable pages");
 
-	memset(gatt, 0, gatt_size);
 	agp_gatt_table = gatt;
 
 	enable_gart_translations();
@@ -788,19 +788,16 @@ void __init gart_iommu_init(void)
 	iommu_size = check_iommu_size(info.aper_base, aper_size);
 	iommu_pages = iommu_size >> PAGE_SHIFT;
 
-	iommu_gart_bitmap = (void *) __get_free_pages(GFP_KERNEL,
+	iommu_gart_bitmap = (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
 						      get_order(iommu_pages/8));
 	if (!iommu_gart_bitmap)
 		panic("Cannot allocate iommu bitmap\n");
-	memset(iommu_gart_bitmap, 0, iommu_pages/8);
 
 #ifdef CONFIG_IOMMU_LEAK
 	if (leak_trace) {
-		iommu_leak_tab = (void *)__get_free_pages(GFP_KERNEL,
+		iommu_leak_tab = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
 				  get_order(iommu_pages*sizeof(void *)));
-		if (iommu_leak_tab)
-			memset(iommu_leak_tab, 0, iommu_pages * 8);
-		else
+		if (!iommu_leak_tab)
 			printk(KERN_DEBUG
 			       "PCI-DMA: Cannot allocate leak trace area\n");
 	}