../arch/x86/boot/version.c:18:12: warning: symbol 'kernel_version' was not declared. Should it be static? ../arch/x86/boot/version.c:18:12: warning: symbol 'kernel_version' was not declared. Should it be static? ../arch/x86/boot/version.c:18:12: warning: symbol 'kernel_version' was not declared. Should it be static?