h8300: switch to NO_BOOTMEM

Commit 0fa1c579 ("of/fdt: use memblock_virt_alloc for early alloc")
inadvertently switched the DT unflattening allocations from memblock to
bootmem which doesn't work because the unflattening happens before
bootmem is initialized. Swapping the order of bootmem init and
unflattening could also fix this, but removing bootmem is desired. So
enable NO_BOOTMEM on h8300 like other architectures have done.

Fixes: 0fa1c579 ("of/fdt: use memblock_virt_alloc for early alloc")
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: uclinux-h8-devel@lists.sourceforge.jp
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>

arch/h8300/Kconfig

@@ -16,6 +16,7 @@ config H8300
 	select OF_IRQ
 	select OF_EARLY_FLATTREE
 	select HAVE_MEMBLOCK
+	select NO_BOOTMEM
 	select TIMER_OF
 	select H8300_TMR8
 	select HAVE_KERNEL_GZIP

arch/h8300/kernel/setup.c

@@ -71,10 +71,6 @@ void __init h8300_fdt_init(void *fdt, char *bootargs)
 
 static void __init bootmem_init(void)
 {
-	int bootmap_size;
-	unsigned long ram_start_pfn;
-	unsigned long free_ram_start_pfn;
-	unsigned long ram_end_pfn;
 	struct memblock_region *region;
 
 	memory_end = memory_start = 0;
@@ -88,33 +84,17 @@ static void __init bootmem_init(void)
 	if (!memory_end)
 		panic("No memory!");
 
-	ram_start_pfn = PFN_UP(memory_start);
-	/* free_ram_start_pfn is first page after kernel */
-	free_ram_start_pfn = PFN_UP(__pa(_end));
-	ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
+	/* setup bootmem globals (we use no_bootmem, but mm still depends on this) */
+	min_low_pfn = PFN_UP(memory_start);
+	max_low_pfn = PFN_DOWN(memblock_end_of_DRAM());
+	max_pfn = max_low_pfn;
 
-	max_pfn = ram_end_pfn;
+	memblock_reserve(__pa(_stext), _end - _stext);
 
-	/*
-	 * give all the memory to the bootmap allocator,  tell it to put the
-	 * boot mem_map at the start of memory
-	 */
-	bootmap_size = init_bootmem_node(NODE_DATA(0),
-					 free_ram_start_pfn,
-					 0,
-					 ram_end_pfn);
-	/*
-	 * free the usable memory,  we have to make sure we do not free
-	 * the bootmem bitmap so we then reserve it after freeing it :-)
-	 */
-	free_bootmem(PFN_PHYS(free_ram_start_pfn),
-		     (ram_end_pfn - free_ram_start_pfn) << PAGE_SHIFT);
-	reserve_bootmem(PFN_PHYS(free_ram_start_pfn), bootmap_size,
-			BOOTMEM_DEFAULT);
+	early_init_fdt_reserve_self();
+	early_init_fdt_scan_reserved_mem();
 
-	for_each_memblock(reserved, region) {
-		reserve_bootmem(region->base, region->size, BOOTMEM_DEFAULT);
-	}
+	memblock_dump_all();
 }
 
 void __init setup_arch(char **cmdline_p)