x86: remove end_pfn in 64bit

and use max_pfn directly.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index cb0bdf4..8467ec2 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -75,7 +75,7 @@
 void __init dma32_reserve_bootmem(void)
 {
 	unsigned long size, align;
-	if (end_pfn <= MAX_DMA32_PFN)
+	if (max_pfn <= MAX_DMA32_PFN)
 		return;
 
 	/*
@@ -94,7 +94,7 @@
 static void __init dma32_free_bootmem(void)
 {
 
-	if (end_pfn <= MAX_DMA32_PFN)
+	if (max_pfn <= MAX_DMA32_PFN)
 		return;
 
 	if (!dma32_bootmem_ptr)