MIPS: Align kernel load address to 64KB

KEXEC needs the new kernel's load address to be aligned on a page
boundary (see sanity_check_segment_list()), but on MIPS the default
vmlinuz load address is only explicitly aligned to 16 bytes.

Since the largest PAGE_SIZE supported by MIPS kernels is 64KB, increase
the alignment calculated by calc_vmlinuz_load_addr to 64KB.

Signed-off-by: Huacai Chen <[e-mail]>
Signed-off-by: Paul Burton <[e-mail]>
Patchwork: https://patchwork.linux-mips.org/patch/21131/
Cc: Ralf Baechle <[e-mail]>
Cc: James Hogan <[e-mail]>
Cc: Steven J . Hill <[e-mail]>
Cc: [e-mail]
Cc: Fuxin Zhang <[e-mail]>
Cc: Zhangjin Wu <[e-mail]>
Cc: <[e-mail]> # 2.6.36+

arch/mips/boot/compressed/calc_vmlinuz_load_addr.c

···
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include "../../../../include/linux/sizes.h"
 
 int main(int argc, char *argv[])
 {
···
 	vmlinuz_load_addr = vmlinux_load_addr + vmlinux_size;
 
 	/*
-	 * Align with 16 bytes: "greater than that used for any standard data
-	 * types by a MIPS compiler." -- See MIPS Run Linux (Second Edition).
+	 * Align with 64KB: KEXEC needs load sections to be aligned to PAGE_SIZE,
+	 * which may be as large as 64KB depending on the kernel configuration.
 	 */
 
-	vmlinuz_load_addr += (16 - vmlinux_size % 16);
+	vmlinuz_load_addr += (SZ_64K - vmlinux_size % SZ_64K);
 
 	printf("0x%llx\n", vmlinuz_load_addr);