arm64: Extend pr_crit message on invalid FDT

Log size in addition to physical and virtual addresses. It has potential
to be helpful when DTB exceeds the 2 MB limit.

Initialize size to 0 to print out sane value if fixmap_remap_fdt fails
without setting the size.

Signed-off-by: Bartosz Szczepanek <bsz@amazon.de>
Link: https://lore.kernel.org/r/20250423084851.26449-1-bsz@amazon.de
Signed-off-by: Will Deacon <will@kernel.org>

Author: Bartosz Szczepanek

arch/arm64/kernel/setup.c

@@ -169,7 +169,7 @@ static void __init smp_build_mpidr_hash(void)
 
 static void __init setup_machine_fdt(phys_addr_t dt_phys)
 {
-	int size;
+	int size = 0;
 	void *dt_virt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
 	const char *name;
 
@@ -182,10 +182,10 @@ static void __init setup_machine_fdt(phys_addr_t dt_phys)
 	 */
 	if (!early_init_dt_scan(dt_virt, dt_phys)) {
 		pr_crit("\n"
-			"Error: invalid device tree blob at physical address %pa (virtual address 0x%px)\n"
-			"The dtb must be 8-byte aligned and must not exceed 2 MB in size\n"
-			"\nPlease check your bootloader.",
-			&dt_phys, dt_virt);
+			"Error: invalid device tree blob: PA=%pa, VA=%px, size=%d bytes\n"
+			"The dtb must be 8-byte aligned and must not exceed 2 MB in size.\n"
+			"\nPlease check your bootloader.\n",
+			&dt_phys, dt_virt, size);
 
 		/*
 		 * Note that in this _really_ early stage we cannot even BUG()