x86: use unflatten_and_copy_device_tree

Use the common unflatten_and_copy_device_tree to copy the built-in FDT
out of init section.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org

diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index 376dc78..0db805c 100644 (file)
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -230,7 +230,7 @@ static void __init dtb_apic_setup(void)
 static void __init x86_flattree_get_config(void)
 {
        u32 size, map_len;
-       void *new_dtb;
+       struct boot_param_header *dt;
 
        if (!initial_dtb)
                return;
@@ -238,24 +238,17 @@ static void __init x86_flattree_get_config(void)
        map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK),
                        (u64)sizeof(struct boot_param_header));
 
-       initial_boot_params = early_memremap(initial_dtb, map_len);
-       size = be32_to_cpu(initial_boot_params->totalsize);
+       dt = early_memremap(initial_dtb, map_len);
+       size = be32_to_cpu(dt->totalsize);
        if (map_len < size) {
-               early_iounmap(initial_boot_params, map_len);
-               initial_boot_params = early_memremap(initial_dtb, size);
+               early_iounmap(dt, map_len);
+               dt = early_memremap(initial_dtb, size);
                map_len = size;
        }
 
-       new_dtb = alloc_bootmem(size);
-       memcpy(new_dtb, initial_boot_params, size);
-       early_iounmap(initial_boot_params, map_len);
-
-       initial_boot_params = new_dtb;
-
-       /* root level address cells */
-       of_scan_flat_dt(early_init_dt_scan_root, NULL);
-
-       unflatten_device_tree();
+       initial_boot_params = dt;
+       unflatten_and_copy_device_tree();
+       early_iounmap(dt, map_len);
 }
 #else
 static inline void x86_flattree_get_config(void) { }