"The arm64 port doesn't provide a screen_info struct for console support
which leads to a build failure with some configurations:

  drivers/video/console/vgacon.c:820: undefined reference to `screen_info'

This patch adds an empty declaration of screen_info to fix the build
problem. Some additional runtime code is needed to actually make it
useful."


diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index ab04a996..54c76fc6 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -73,6 +73,10 @@ unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT;
 unsigned int compat_elf_hwcap2 __read_mostly;
 #endif
 
+#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
+struct screen_info screen_info;
+#endif
+
 static const char *cpu_name;
 static const char *machine_name;
 phys_addr_t __fdt_pointer __initdata;