2.5.47-ac5:undefined reference to `boot_gdt_table'

ld -m elf_i386 -e stext -T arch/i386/vmlinux.lds.s arch/i386/kernel/
head.o \ arch/i386/kernel/init_task.o init/built-in.o --start-group usr/built-in.o \ arch/i386/kernel/built-in.o arch/i386/mm/built-in.o
\ arch/i386/mach-generic/built-in.o kernel/built-in.o mm/built-in.o fs/built-in.o \ ipc/built-in.o security/built-in.o crypto/
built-in.o drivers/built-in.o \ sound/built-in.o arch/i386/pci/ built-in.o net/built-in.o lib/lib.a \ arch/i386/lib/lib.a --end-group -o .tmp_vmlinux1 \ arch/i386/kernel/built-in.o(.data+0x15a 5): In function `gdt_48': : undefined \
reference to `boot_gdt_table' make: ***
[.tmp_vmlinux1] Error 1

Quoted 11 lines

ld -m elf_i386 -e stext -T arch/i386/vmlinux.lds.s arch/i386/kernel/
head.o \ arch/i386/kernel/init_task.o init/built-in.o --start-group usr/built-in.o \ arch/i386/kernel/built-in.o arch/i386/mm/built-in.o
\ arch/i386/mach-generic/built-in.o kernel/built-in.o mm/built-in.o fs/built-in.o \ ipc/built-in.o security/built-in.o crypto/
built-in.o drivers/built-in.o \ sound/built-in.o arch/i386/pci/ built-in.o net/built-in.o lib/lib.a \ arch/i386/lib/lib.a --end-group -o .tmp_vmlinux1 \ arch/i386/kernel/built-in.o(.data+0x15a 5): In function `gdt_48': : undefined \
reference to `boot_gdt_table' make: ***
[.tmp_vmlinux1] Error 1

I think this is because -ac5 has X86_TRAMPOLINE dependent on X86_LOCAL_APIC.

If you change

config X86_TRAMPOLINE

	bool
	depends on SMP || (VOYAGER && SMP) || X86_LOCAL_APIC

to

depends on SMP

in arch/i386/Kconfig

does this fix the problem?