MIPS: Use early_init_fdt_reserve_self to protect DTB location

early_init_fdt_reserve_self is used to tell the boot memory allocator
that a memory is occupied by the DTB, so add it in the MIPS init code to
ensure information about the DTB is added to the boot memory array.

Signed-off-by: Marcin Nowakowski <[e-mail]>
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/14610/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/kernel/prom.c

···
 	return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
 }
 
+int __init early_init_dt_reserve_memory_arch(phys_addr_t base,
+					phys_addr_t size, bool nomap)
+{
+	add_memory_region(base, size, BOOT_MEM_RESERVED);
+	return 0;
+}
+
 void __init __dt_setup_arch(void *bph)
 {
 	if (!early_init_dt_scan(bph))

arch/mips/kernel/setup.c

···
 #include <linux/device.h>
 #include <linux/dma-contiguous.h>
 #include <linux/decompress/generic.h>
+#include <linux/of_fdt.h>
 
 #include <asm/addrspace.h>
 #include <asm/bootinfo.h>
···
 		pr_info("User-defined physical RAM map:\n");
 		print_memory_map();
 	}
+
+	early_init_fdt_reserve_self();
+	early_init_fdt_scan_reserved_mem();
 
 	bootmem_init();
 #ifdef CONFIG_PROC_VMCORE