of: consolidate definition of early_init_dt_alloc_memory_arch()

Most architectures use the same implementation. Collapse the common ones
into a single weak function that can be overridden.
Signed-off-by: Grant Likely <grant.likely@linaro.org>

arch/arc/kernel/devtree.c

@@ -18,12 +18,6 @@
 #include <asm/clk.h>
 #include <asm/mach_desc.h>
 
-/* called from unflatten_device_tree() to bootstrap devicetree itself */
-void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
-{
-	return __va(memblock_alloc(size, align));
-}
-
 /**
  * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
  * @dt:		virtual address pointer to dt blob

arch/arm64/kernel/setup.c

@@ -190,11 +190,6 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 	memblock_add(base, size);
 }
 
-void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
-{
-	return __va(memblock_alloc(size, align));
-}
-
 /*
  * Limit the memory size that was specified via FDT.
  */

arch/c6x/kernel/devicetree.c

@@ -45,8 +45,3 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 {
 	c6x_add_memory(base, size);
 }
-
-void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
-{
-	return __va(memblock_alloc(size, align));
-}

arch/microblaze/kernel/prom.c

@@ -46,11 +46,6 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 	memblock_add(base, size);
 }
 
-void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
-{
-	return __va(memblock_alloc(size, align));
-}
-
 #ifdef CONFIG_EARLY_PRINTK
 static char *stdout;
 

arch/openrisc/kernel/prom.c

@@ -55,11 +55,6 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 	memblock_add(base, size);
 }
 
-void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
-{
-	return __va(memblock_alloc(size, align));
-}
-
 void __init early_init_devtree(void *params)
 {
 	void *alloc;

arch/powerpc/kernel/prom.c

@@ -544,11 +544,6 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 	memblock_add(base, size);
 }
 
-void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
-{
-	return __va(memblock_alloc(size, align));
-}
-
 #ifdef CONFIG_BLK_DEV_INITRD
 void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
 {

drivers/of/fdt.c

@@ -11,6 +11,7 @@
 
 #include <linux/kernel.h>
 #include <linux/initrd.h>
+#include <linux/memblock.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>
@@ -700,6 +701,17 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
 	return 1;
 }
 
+#ifdef CONFIG_HAVE_MEMBLOCK
+/*
+ * called from unflatten_device_tree() to bootstrap devicetree itself
+ * Architectures can override this definition if memblock isn't used
+ */
+void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align)
+{
+	return __va(memblock_alloc(size, align));
+}
+#endif
+
 /**
  * unflatten_device_tree - create tree of device_nodes from flat blob
  *