x86, mm: Unify zone_sizes_init()

Now that zone_sizes_init() is identical on 32-bit and 64-bit,
move the code to arch/x86/mm/init.c and use it for both
architectures.

Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Link: http://lkml.kernel.org/r/1320155902-10424-7-git-send-email-penberg@kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/include/asm/init.h

@@ -5,6 +5,8 @@
 extern void __init early_ioremap_page_table_range_init(void);
 #endif
 
+extern void __init zone_sizes_init(void);
+
 extern unsigned long __init
 kernel_physical_mapping_init(unsigned long start,
 			     unsigned long end,

arch/x86/mm/init.c

@@ -3,6 +3,7 @@
 #include <linux/ioport.h>
 #include <linux/swap.h>
 #include <linux/memblock.h>
+#include <linux/bootmem.h>	/* for max_low_pfn */
 
 #include <asm/cacheflush.h>
 #include <asm/e820.h>
@@ -15,6 +16,7 @@
 #include <asm/tlbflush.h>
 #include <asm/tlb.h>
 #include <asm/proto.h>
+#include <asm/dma.h>		/* for MAX_DMA_PFN */
 
 unsigned long __initdata pgt_buf_start;
 unsigned long __meminitdata pgt_buf_end;
@@ -392,3 +394,24 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 	free_init_pages("initrd memory", start, PAGE_ALIGN(end));
 }
 #endif
+
+void __init zone_sizes_init(void)
+{
+	unsigned long max_zone_pfns[MAX_NR_ZONES];
+
+	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
+
+#ifdef CONFIG_ZONE_DMA
+	max_zone_pfns[ZONE_DMA]		= MAX_DMA_PFN;
+#endif
+#ifdef CONFIG_ZONE_DMA32
+	max_zone_pfns[ZONE_DMA32]	= MAX_DMA32_PFN;
+#endif
+	max_zone_pfns[ZONE_NORMAL]	= max_low_pfn;
+#ifdef CONFIG_HIGHMEM
+	max_zone_pfns[ZONE_HIGHMEM]	= max_pfn;
+#endif
+
+	free_area_init_nodes(max_zone_pfns);
+}
+

arch/x86/mm/init_32.c

@@ -674,25 +674,6 @@ void __init initmem_init(void)
 }
 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
 
-static void __init zone_sizes_init(void)
-{
-	unsigned long max_zone_pfns[MAX_NR_ZONES];
-
-	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
-#ifdef CONFIG_ZONE_DMA
-	max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
-#endif
-#ifdef CONFIG_ZONE_DMA32
-        max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
-#endif
-	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
-#ifdef CONFIG_HIGHMEM
-	max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
-#endif
-
-	free_area_init_nodes(max_zone_pfns);
-}
-
 void __init setup_bootmem_allocator(void)
 {
 	printk(KERN_INFO "  mapped low ram: 0 - %08lx\n",

arch/x86/mm/init_64.c

@@ -612,25 +612,6 @@ void __init initmem_init(void)
 }
 #endif
 
-static void __init zone_sizes_init(void)
-{
-	unsigned long max_zone_pfns[MAX_NR_ZONES];
-
-	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
-#ifdef CONFIG_ZONE_DMA
-	max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
-#endif
-#ifdef CONFIG_ZONE_DMA32
-	max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
-#endif
-	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
-#ifdef CONFIG_HIGHMEM
-	max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
-#endif
-
-	free_area_init_nodes(max_zone_pfns);
-}
-
 void __init paging_init(void)
 {
 	sparse_memory_present_with_active_regions(MAX_NUMNODES);