[PATCH] Have x86_64 use add_active_range() and free_area_init_nodes

Size zones and holes in an architecture independent manner for x86_64.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Andi Kleen <ak@muc.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: "Keith Mannthey" <kmannth@gmail.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 6 insertions, 59 deletions

diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c
index 1e4669fa5734..47928399e38a 100644
--- a/arch/x86_64/mm/init.c
+++ b/arch/x86_64/mm/init.c
@@ -403,69 +403,15 @@ void __cpuinit zap_low_mappings(int cpu)
         __flush_tlb_all();
 }
 
-/* Compute zone sizes for the DMA and DMA32 zones in a node. */
-__init void
-size_zones(unsigned long *z, unsigned long *h,
-           unsigned long start_pfn, unsigned long end_pfn)
-{
-        int i;
-        unsigned long w;
-
-        for (i = 0; i < MAX_NR_ZONES; i++)
-                z[i] = 0;
-
-        if (start_pfn < MAX_DMA_PFN)
-                z[ZONE_DMA] = MAX_DMA_PFN - start_pfn;
-        if (start_pfn < MAX_DMA32_PFN) {
-                unsigned long dma32_pfn = MAX_DMA32_PFN;
-                if (dma32_pfn > end_pfn)
-                        dma32_pfn = end_pfn;
-                z[ZONE_DMA32] = dma32_pfn - start_pfn;
-        }
-        z[ZONE_NORMAL] = end_pfn - start_pfn;
-
-        /* Remove lower zones from higher ones. */
-        w = 0;
-        for (i = 0; i < MAX_NR_ZONES; i++) {
-                if (z[i])
-                        z[i] -= w;
-                w += z[i];
-        }
-
-        /* Compute holes */
-        w = start_pfn;
-        for (i = 0; i < MAX_NR_ZONES; i++) {
-                unsigned long s = w;
-                w += z[i];
-                h[i] = e820_hole_size(s, w);
-        }
-
-        /* Add the space pace needed for mem_map to the holes too. */
-        for (i = 0; i < MAX_NR_ZONES; i++)
-                h[i] += (z[i] * sizeof(struct page)) / PAGE_SIZE;
-
-        /* The 16MB DMA zone has the kernel and other misc mappings.
-           Account them too */
-        if (h[ZONE_DMA]) {
-                h[ZONE_DMA] += dma_reserve;
-                if (h[ZONE_DMA] >= z[ZONE_DMA]) {
-                        printk(KERN_WARNING
-                                "Kernel too large and filling up ZONE_DMA?\n");
-                        h[ZONE_DMA] = z[ZONE_DMA];
-                }
-        }
-}
-
 #ifndef CONFIG_NUMA
 void __init paging_init(void)
 {
-        unsigned long zones[MAX_NR_ZONES], holes[MAX_NR_ZONES];
-
+        unsigned long max_zone_pfns[MAX_NR_ZONES] = {MAX_DMA_PFN,
+                                                        MAX_DMA32_PFN,
+                                                        end_pfn};
         memory_present(0, 0, end_pfn);
         sparse_init();
-        size_zones(zones, holes, 0, end_pfn);
-        free_area_init_node(0, NODE_DATA(0), zones,
-                            __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes);
+        free_area_init_nodes(max_zone_pfns);
 }
 #endif
 
@@ -608,7 +554,8 @@ void __init mem_init(void)
 #else
         totalram_pages = free_all_bootmem();
 #endif
-        reservedpages = end_pfn - totalram_pages - e820_hole_size(0, end_pfn);
+        reservedpages = end_pfn - totalram_pages -
+                                        absent_pages_in_range(0, end_pfn);
 
         after_bootmem = 1;